EP0407373A2 - Tube à décharge dans les gaz - Google Patents

Tube à décharge dans les gaz Download PDF

Info

Publication number
EP0407373A2
EP0407373A2 EP90890199A EP90890199A EP0407373A2 EP 0407373 A2 EP0407373 A2 EP 0407373A2 EP 90890199 A EP90890199 A EP 90890199A EP 90890199 A EP90890199 A EP 90890199A EP 0407373 A2 EP0407373 A2 EP 0407373A2
Authority
EP
European Patent Office
Prior art keywords
gas discharge
discharge vessel
gas
tube
discharge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP90890199A
Other languages
German (de)
English (en)
Other versions
EP0407373A3 (en
Inventor
Herbert C/O Vector Related Physics Fuchs
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TIEFENSTRAHLER-QUARZLAMPEN GmbH
Original Assignee
TIEFENSTRAHLER-QUARZLAMPEN GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by TIEFENSTRAHLER-QUARZLAMPEN GmbH filed Critical TIEFENSTRAHLER-QUARZLAMPEN GmbH
Publication of EP0407373A2 publication Critical patent/EP0407373A2/fr
Publication of EP0407373A3 publication Critical patent/EP0407373A3/de
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/04—Electrodes; Screens; Shields
    • H01J61/10—Shields, screens, or guides for influencing the discharge
    • H01J61/106—Shields, screens, or guides for influencing the discharge using magnetic means

Definitions

  • the invention relates to a gas discharge tube with a cylindrical discharge vessel filled with gas, which is preferably under negative pressure, and with electrodes provided at the ends of the discharge vessel, a cylindrical body being provided in the interior of the discharge vessel.
  • Gas discharge tubes of this type are based on the radiation emission of a gas discharge in dilute gases and with the help of foreign element additives.
  • the radiation released in this is defined with regard to its frequency and thus its wavelength.
  • a molecule or atom can also be excited to higher energy states by the energy of radiation. Since the different excitation states of an atom or molecule have precisely defined energy differences, only the wavelength suitable for the respective quantum jump can be used for excitation. One then speaks of absorption. An atom (or molecule) absorbs electromagnetic radiation with exactly the same wavelength (frequency) that it emits even when excited.
  • the radiation emission of a gas discharge with a rod-shaped shape can be considerably more intense at points where the cross-section of the discharge tube narrows than in the larger diameter points of the tube.
  • the reason for this is the current density, ie the current strength related to the unit of the cross-sectional area of the (gaseous) conductor.
  • the total current flowing through the tube must be the same size on any cross-sectional area of the discharge tube due to the law of flooding.
  • the current density at each cross section is therefore from the quotient Current and cross-sectional area of the discharge tube given. Accordingly, the current density is inversely proportional to the cross-sectional area.
  • the gas discharge therefore behaves differently in a tapered tube part, since there is a higher current density here.
  • the radiation emission of the gas in a discharge tube is largely determined by the statistical probability of electron impulse excitation, which is at least theoretically proportional to the current density under otherwise identical conditions such as vapor pressure, temperature and gas pressure.
  • the total radiation power (beam flow) of a tube is the product of the radiance per unit area and the total radiating area.
  • the radiation emission per unit area of radiation area is therefore higher due to the higher current density, but the total radiant area (surface) is smaller.
  • the cross-section and the surface are clearly mathematically related. Accordingly, the jet flow occurring in a cross-sectional change (e.g. capillary tube).
  • the tube temperature rises excessively due to the high current density and thus also other parameters such as vapor pressure, gas pressure, electrical resistance, burning voltage etc., which can have very negative effects on the radiation yield.
  • vapor pressure gas pressure
  • electrical resistance burning voltage etc.
  • the higher specific power is also based on a smaller size. (High pressure burner, capillary burner, etc.).
  • a magnetron tube in which the area receiving the cathode is widened compared to the remaining section of the tube.
  • a coil is provided outside the tube, by means of which a magnetic field pattern is generated, the field lines of which are aligned in the tube axis.
  • an aperture is built into it, the aperture of which is smaller than the inner cross section of the tube itself.
  • An electric discharge lamp is known from US Pat. No. 3,611,015, which has a substantially spherical body in which four electrodes protrude. The electrodes are connected to each other in pairs on the same circuit, so that several paths for the arc are formed.
  • a gas discharge tube of the type mentioned is known from US Pat. No. 4,341,979.
  • the cylindrical body arranged in the interior of the discharge vessel serves to increase the yield of visible light in that the cylindrical body has a phosphorescent outer surface. This is to increase the likelihood that the UV quanta formed in the vicinity of the cylindrical body will be converted into visible light.
  • the invention is based on the object, based on the described prior art and on the knowledge that the outwardly penetrating radiation predominantly comes from a relatively thin surface layer of the light column, a gas discharge tube of the type mentioned in such a way that a higher radiation yield is achieved.
  • the invention relates to a gas discharge tube, consisting of a cylindrical discharge vessel which is preferably transmissive for wavelengths of more than 180 nm and with, in particular thermoemissive electrodes which are melted down in a gas-tight manner at the ends of the discharge vessel and in which a hollow, cylindrical body is arranged coaxially.
  • the hollow, cylindrical body extends as a displacer tube over the entire length of the discharge vessel and contains magnetic field-generating devices in its cavity which the electron flow occurring during gas discharge in the annular discharge space remaining between the displacer body and the discharge vessel in force path-lengthening curvatures.
  • a gas discharge tube consisting of a cylindrical discharge vessel which is preferably transmissive for wavelengths of more than 180 nm and each with a plurality of electrodes, in particular thermoemissive, which are melted down gas-tight at the ends of the discharge vessel and which contains an ionizable gas, preferably under negative pressure, and in that a gas discharge can take place according to the invention in that there is a hollow, cylindrical displacer body in the discharge vessel, which contains magnetic field-generating devices in its interior, which force the electron flow occurring during the gas discharge in the remaining discharge space, which is annularly formed by the displacer body, into path-lengthening path curvatures, with multiple ones , symmetrical parallel discharges between the electrodes in the annular discharge space are caused by electromagnetic interactions, a homogeneous plasma configuration of high total current density.
  • a gas discharge tube consisting of a cylindrical discharge vessel which is preferably transmissive for wavelengths of more than 180 nm, which has a smaller diameter in its central section than in the area of the end sections and in the area of the end sections in each case a plurality of, in particular thermoemissive, melted-down, gas-tight electrodes are attached and which is filled with an ionizable gas, preferably under vacuum, in which a gas discharge can take place
  • a concentrically arranged, hollow, cylindrical displacer body is located in the discharge vessel, which contains magnetic field generating devices in its interior , in the (annular gap) space created by the displacer in the region of the smaller-diameter section of the discharge vessel, a predominantly radial field line pattern of alternating polarity cause that homogenizes the parallel discharges occurring simultaneously, but shown separately, between the electrodes and forces them into path curvatures running radially to the annular gap.
  • a gas discharge tube consisting of a cylindrical and preferably transparent for wavelengths of more than 180 nm Dungsgefäß, which has a smaller diameter in its central section than in the region of the end sections and in which in the region of the end sections in each case a plurality of gas-tight fused, in particular thermoemissive electrodes are attached, and which is filled with an ionizable, preferably underpressure gas and which a gas discharge can take place according to the invention is characterized in that a cylindrical displacer formed as a hollow tube extends over the entire length of the discharge vessel, magnets in the cavity of the displacer being arranged with poles in the same direction and adjacent to one another, between the displacer and the smaller diameter Section of the discharge vessel an (annular gap) space is formed with a small cross-sectional area, in which parallel discharges between the El electrodes a plasma of high current density is homogenized by electromagnetic interaction with the magnets and forced into path-lengthening path curvatures.
  • the object mentioned above can also be achieved in a gas discharge tube of the type mentioned at the outset in that the cylindrical body, which is designed as a hollow tube and is arranged in the discharge vessel, extends as a displacer tube over the entire length of the tubular discharge vessel, and in that the discharge vessel is in its middle section has a smaller diameter than in the region of the end sections in which the electrodes are provided.
  • the invention makes use of the knowledge that almost all of the radiation of the gas discharge which can be detected from the outside originates from a relatively thin surface layer of the light column, since the interactive absorption explained above is present in the deeper layers and in the interior of the plasma column.
  • the gas discharge tube according to the invention consists of two concentric tubes (with appropriately attached power supplies) in whose free, narrow space a gas discharge with an annular cross section burns.
  • the annular gap tube according to the invention therefore allows high beam densities on a comparatively large surface and thus a high beam flow.
  • magnets which are arranged at a distance from one another and are aligned adjacent to one another with the same poles, are provided in the interior of the displacement tube, so that essentially radially opposing magnetic fields result.
  • the likelihood of electron impulse excitation is increased in that the electrons in the gas discharge on the direct connection path between them by means of the magnetic fields the electrodes are prevented and forced into path-lengthening curvatures.
  • a further possibility for making the gas discharge in the gas discharge tube according to the invention more uniform is, according to the invention, that several, for example symmetrically arranged electrodes are present at the ends of the common discharge path.
  • the electrodes are not connected in series or in series at the common potential, in order to avoid that after ignition of the discharge between two electrodes, which are not necessarily opposite, the remaining electrodes remain without sufficient ignition potential and the desired effect is absent due to the voltage drop associated therewith.
  • a corresponding pair of electrodes is connected to a separate, best galvanically isolated power supply, but in phase, so that no potential differences between adjacent cathodes can occur.
  • Another aid to make the discharge in the gas discharge tube according to the invention more uniform is the disproportionate enlargement of the combustion chamber in the immediate vicinity of the electrodes and their integration into the actual annular gap combustion chamber by means of a suitable geometric design (e.g. transition cone, nozzle cone, curvature etc.). From the "plasma cloud” widened in the electrode area, the charge carriers flow more uniformly into the annular gap on less preferred paths.
  • a suitable geometric design e.g. transition cone, nozzle cone, curvature etc.
  • a magnet system is used to force the electrons in the path-extending path curvatures, this can consist of permanent magnets or of electromagnets or field coils.
  • the two last-mentioned systems can either have a separate energy supply, but if the ohmic resistance and / or inductive resistance is not significant, the feed can also consist in the main or shunt of the primary supply of the discharge tube.
  • the magnetic field generated has such a shape that the deflection effect is caused by the field line pattern preferably in the circumferential direction of the annular gap between the discharge flow and the cylindrical body (displacement tube) arranged in it.
  • this results in path-lengthening path curvatures of the electrons in the form of a curve (eg sinusoidal) or a helical shape.
  • round permanent disc magnets which are polarized in the axial direction and which are stacked in a rod shape with spacers therebetween are provided in such a way that poles of the same name face each other.
  • the field line pattern that forms between two poles mainly has radial components near the disc magnets.
  • the alternating north-south polarized field lines are predominantly perpendicular to the effective electron paths in the annular gap discharge space and the deflecting vector is perpendicular to the main direction of flow of the electrons. Due to the periodically changing polarity of the field, meandering path curvatures are also formed, for example.
  • field coils or electromagnets can also be used (opposite winding or switching). This eliminates the disadvantage that the field strength of permanent magnets or coils with an iron core are weakened at high operating temperatures.
  • the gas discharge space in the gas discharge tube according to the invention has an outer surface (formed by the discharge vessel) and an inner surface (formed by the displacement tube), the dimensions of which do not differ significantly from one another, there is in principle also the possibility of mirroring the part of the radiation directed towards the interior of the tube of the cylindrical body (displacement tube) to steer outwards.
  • the effect of such a mirroring depends to a large extent on the width of the annular gap and thus on the layer thickness of the plasma.
  • the reflected radiation must namely penetrate the entire thickness of the plasma layer and suffer an absorption which is dependent on many parameters.
  • the guide tube which receives the permanent magnets, is polished on its outer surface and is therefore designed to be reflective.
  • the gas discharge tube according to the invention is a highly efficient fluorescent tube.
  • a wide variety of sizes can also be used, ranging from small to large-volume units.
  • the gas discharge tube according to the invention can be used in the high, medium and low pressure range.
  • the embodiments of the gas discharge tube shown in the drawing relate to a high-performance tube for emitting UVC radiation with a wavelength of 254 Nm.
  • Such gas discharge tubes are primarily designed for water disinfection and other sterilization purposes. This radiation also serves to excite the fluorescent layer in conventional fluorescent tubes.
  • the radiation with a wavelength of 254 Nm is dominant in relation to the other emissions in the optical spectral range, so that there is practically a line source.
  • the gas discharge tube according to the invention can be designed with a similar or identical design by changing the parameters for gas filling and the addition of foreign elements to generate other optical frequencies and thus for other areas of application.
  • a displacer tube 2 which is mounted concentrically therein and is designed as a cylindrical body, consist of approximately 1 mm thick, highly transparent quartz tubes with a permeability of 254 nm for the spectral range.
  • the pipe socket 6 are the same axis and mirror image.
  • the discharge vessel 1 widens conically in order to merge into the slightly curved end faces 3 via a cylindrical part 8 that is about a tube diameter long.
  • the electrodes 4, 5 are provided, which are guided through the pipe sockets 6 attached to the end faces.
  • the electrodes 4, 5 are do Tated step electrodes made of tungsten, as are generally used for gas discharge tubes.
  • the electrodes 4, 5 protrude completely into the cathode space 9 and are fastened to power supply wires 10 near the inside of the end faces 3.
  • the pump tube is not shown in the drawing.
  • a magnet system 11 is removably arranged, which consists of disk-shaped permanent magnets 12 with iron disks 13 in between as spacers.
  • the magnets 12 are stacked with the polarity facing the same name and the small iron disks 13 located between them in an aluminum guide tube (not shown in the drawing) and secured in this by crimping the tube edges.
  • the outer surface of the guide tube is metallic and therefore reflective.
  • electrodes 4 and 5 which in the exemplary embodiment are preferably doped step electrodes made of tungsten wire and which can be loaded up to approx. 3.5 amperes per cathode, two electrodes which lie opposite one another axially symmetrically belong together to form a "corresponding pair of electrodes" 14.
  • Pure argon is used as the gas filling for operation as a UVC high-performance tube (the use of xenon is possible in principle or as an admixture, but is normally not necessary).
  • the filling pressure for argon is approximately 150 pascals (1.5 mbar). It should be as low as possible, but still ensure proper ignition of the tube and can be varied depending on the dimension of a tube.
  • Purest mercury is used as an additive element for the generation of 254 nm resonance line radiation.
  • the mercury dosage is exceptionally low and is initially determined empirically depending on the size of the tube, since a partial diffusion of mercury occurs into the quartz walls of the tube body and the calculated amount is then not really available for discharge.
  • the dosage amount may have to be varied.
  • the electrodes must be degassed, annealed and formed at the same time, since otherwise outgassing products of a hot cathode settle on a non-active and therefore cold cathode.
  • a separate device is required which has a separate supply circuit in phase for each corresponding pair of electrodes.
  • quartz powder can be used, which is melted in an evacuated quartz reaction vessel after adding the intended amount of mercury under vacuum and heated for some time in an annealing furnace. The mercury changes into the gas form, penetrates the quartz powder in order to condense evenly on the quartz grains during the later cooling process.
  • Each corresponding pair of electrodes of the total of eight electrodes 4, 5 is supplied with current via an independent circuit.
  • the individual circuits are in phase and connected in parallel.
  • the total current flowing through the discharge is the sum of the four individual currents.
  • the size of the tube and the total current used determine its average operating temperature. For high beam powers, this is in the range of around 300 ° C.
  • the small amount of mercury is almost exclusively in gaseous form when the tube is cold and only follows the vapor pressure curve when the tube is heated, but then follows the general gas equation and Gay-Lussac's law. However, this is not precise, since this requires a volume with an unchangeable amount of gas. With increasing temperature of the discharge vessel, however, amounts of mercury diffused out of the vessel wall are released, which increase the amount of gas.
  • the discharge for high performance begins with the lowest radiation and only becomes more intense from a tube temperature of 180 ° C, because the walls then release the bound mercury molecules. On average, full performance is given after 7-10 minutes.
  • FIG. 4 largely corresponds to that of the embodiment of FIGS. 1 to 3 in terms of material and design.
  • helical ribs (swirl webs) 15 consisting of thin quartz strips are attached to the displacer tube 2.
  • the free edges of the swirl webs 15 have no fixed connection to the inner wall of the discharge vessel 1, but are dimensioned at a small tolerance distance from this.
  • the swirl angle is 180 ° in the exemplary embodiment shown.
  • the distance between the edges of the swirl webs 15 and the wall of the discharge vessel 1 allows gas pressure compensation, but represents a relatively high electrical resistance for the plasma of the gas discharge, since the mean free electron path length is very limited there.
  • the discharge consequently follows the free fields 16 of the annular gap 7 located between the swirl webs 15. These do not represent the shortest connection between two axially-symmetrically opposite electrodes 4, 5.
  • Corresponding electrodes 4, 5 in the exemplary embodiment of FIG. 4 are always those which are arranged at the beginning and at the end of a swirl field 16. With four pairs of electrodes, the twist angle is therefore always a multiple of 90 °.
  • the geometric path lengthening of the discharge gap with the tube length remaining the same increases the probability of electron impulse excitation.
  • the width of the discharge path is restricted and the relative current density is therefore higher. The effect of the annular gap 7 is thus increased.
  • corresponding electrode pairs are not axially symmetrical with respect to one another.
  • FIG. 4 The other configurations of the embodiments of the gas discharge tube according to the invention shown in FIG. 4 correspond to those of FIG. 1, wherein the magnet system 11 described with reference to FIGS. 1 to 3 can also be used. It should be taken into account that strong deflection effects due to the magnet system 11 lead to an increased temperature of the swirl webs 15 and of the gas discharge tube as a whole.

Landscapes

  • Plasma Technology (AREA)
  • Gas-Filled Discharge Tubes (AREA)
EP19900890199 1989-07-05 1990-07-02 Gas discharge tube Withdrawn EP0407373A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT164089A AT394469B (de) 1989-07-05 1989-07-05 Gasentladungsroehre
AT1640/89 1989-07-05

Publications (2)

Publication Number Publication Date
EP0407373A2 true EP0407373A2 (fr) 1991-01-09
EP0407373A3 EP0407373A3 (en) 1991-08-28

Family

ID=3517787

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900890199 Withdrawn EP0407373A3 (en) 1989-07-05 1990-07-02 Gas discharge tube

Country Status (2)

Country Link
EP (1) EP0407373A3 (fr)
AT (1) AT394469B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009107067A3 (fr) * 2008-02-25 2009-11-26 Avraham Emanuel Lampe à haut rendement remplie de gaz
WO2012025924A3 (fr) * 2010-08-24 2012-07-26 Yehi-Or Light Creation Ltd. Lampe éconénergétique
NL2018126B1 (nl) * 2017-01-04 2018-07-25 Ebel Van Der Schoot Jelle Inrichting en werkwijze voor het produceren van fotonen, alsmede een werkwijze samenstel voor het produceren van elektrisch vermogen of warmte

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012103268B4 (de) * 2012-04-16 2015-08-20 Walter Wallner Gasentladungslampe mit Verbindungsbereich zwischen Innenzylinder und Aussenrohr und Durchgangsöffnung im Verbindungsbereich

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3084271A (en) * 1960-09-06 1963-04-02 Duro Test Corp Multiple arc fluorescent lamp
GB932167A (en) * 1960-11-14 1963-07-24 Gen Electric Co Ltd Improvements in or relating to low pressure mercury vapour fluorescent electric discharge lamps
US3320462A (en) * 1963-09-10 1967-05-16 Joslyn Mfg & Supply Co Spark gap structure with annular concentric magnets for rotating arc
US4341979A (en) * 1980-02-14 1982-07-27 Leo Gross Fluorescent lamp with rotating magnetic field arc spreading device
US4780645A (en) * 1986-01-14 1988-10-25 Matsushita Electric Works, Ltd. Electronic light radiation tube

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009107067A3 (fr) * 2008-02-25 2009-11-26 Avraham Emanuel Lampe à haut rendement remplie de gaz
WO2012025924A3 (fr) * 2010-08-24 2012-07-26 Yehi-Or Light Creation Ltd. Lampe éconénergétique
CN103081057A (zh) * 2010-08-24 2013-05-01 耶合-奥灯具创造有限公司 高能效灯
NL2018126B1 (nl) * 2017-01-04 2018-07-25 Ebel Van Der Schoot Jelle Inrichting en werkwijze voor het produceren van fotonen, alsmede een werkwijze samenstel voor het produceren van elektrisch vermogen of warmte

Also Published As

Publication number Publication date
ATA164089A (de) 1991-09-15
AT394469B (de) 1992-04-10
EP0407373A3 (en) 1991-08-28

Similar Documents

Publication Publication Date Title
EP0733266B1 (fr) Procede permettant de faire fonctionner une source de rayonnenent a emission incoherente
DE69317500T2 (de) Fluoreszenzlampe
DE3784241T2 (de) Leuchtstoffbeleuchtungssystem.
CH677292A5 (fr)
DE2809957A1 (de) Elektrodenlose fluoreszenzlampe mit reflektierendem ueberzug
DE1165749B (de) Optischer Verstaerker
DE69710837T2 (de) Zündplättchenvorrichtung für röhrenförmige Niederdruckentladungslampen
DE4302465C1 (de) Vorrichtung zum Erzeugen einer dielektrisch behinderten Entladung
DE102005050306B3 (de) Elektrodenlose Gasentladungslampe
EP3808160B1 (fr) Dispositif destiné à produire une décharge auxiliaire à filaments pour un dispositif destiné à produire des rayons x et un rayonnement de particules ainsi que pour un réacteur à fusion pourvu du dispositif destiné à produire des rayons x et un rayonnement de particules et procédé destiné à produire des rayons x et un rayonnement de particules
AT394469B (de) Gasentladungsroehre
EP1276137B1 (fr) Lampe a décharge à barrière diélectrique avec une aide à l'allumage
DE2819542A1 (de) Niederdruckmetalldampfentladungslampe
DE2656949C2 (de) Leuchtstofflampe
DE2601587B2 (de) Leuchtstofflampe
DE2924593A1 (de) Lampe mit quellenfreiem elektrischem feld und verminderter elektromagnetischer stoerung
DE3119223C2 (de) Entladungslampenvorrichtung
EP2054922A2 (fr) Lampe à décharge basse pression
DE102014110686A1 (de) Treiberschaltkreis, Lampenanordnung und Verfahren zum Herstellen einer Spulenanordnung
DE19741668A1 (de) Entladungslampe
DE102023133105B4 (de) Hochfrequenzplasmalichtquelle
DE102015101804A1 (de) Blitzlampenanordnung und Blitzlampen-Lageranordnung
DE69125717T2 (de) Entladungslampenanordnung
WO2014037118A1 (fr) Lampe à décharge à empêchement diélectrique
EP1168895B1 (fr) Dispositif à impulsions avec un système de production de rayonnement et procédé de production de rayonnement

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE CH DE DK ES FR GB GR IT LI LU NL SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE CH DE DK ES FR GB GR IT LI LU NL SE

17P Request for examination filed

Effective date: 19920206

17Q First examination report despatched

Effective date: 19940309

RAP3 Party data changed (applicant data changed or rights of an application transferred)

Owner name: TIEFENSTRAHLER-QUARZLAMPEN GMBH

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19970617

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST