WO2003014614A1 - Procede de reparation de conduites - Google Patents
Procede de reparation de conduites Download PDFInfo
- Publication number
- WO2003014614A1 WO2003014614A1 PCT/FR2002/002793 FR0202793W WO03014614A1 WO 2003014614 A1 WO2003014614 A1 WO 2003014614A1 FR 0202793 W FR0202793 W FR 0202793W WO 03014614 A1 WO03014614 A1 WO 03014614A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pipe
- reinforcements
- excavation
- tension
- trench
- 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.)
- Ceased
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/18—Appliances for use in repairing pipes
Definitions
- the present invention relates to a method for repairing buried pipes.
- the invention relates to a method of repairing pressurized fluid transport pipes formed by joining end to end segments of prestressed concrete pipe.
- These pipes belong for example to a water supply network.
- these pipes consist of an end-to-end assembly of prestressed concrete pipe segments, with a diameter varying from approximately 0.5 m to 6 m.
- the water circulates there under a pressure which can go up to about twenty bars.
- These concrete pipe segments may have an interior metal coating (liner). It is however not designed to withstand the pressure forces due to the fluid in circulation.
- These efforts are taken up by the prestressing of the concrete, carried out by means of wires wound in a spiral outside the concrete core of the pipe segment. During the prefabrication of this segment, its concrete core is rotated around its axis to receive the wire which is braked to be tensioned.
- This wire is then protected against corrosion by spraying an additional layer of concrete or mortar over a few tens of millimeters.
- this protective layer and the passivation of the steel constituting these prestressing wires it sometimes happens that the prestressing wires are the site of corrosion which generally leads to degradation of the protective coating, and therefore to an acceleration of the phenomenon, which can cause a break in the wires and therefore a structural weakening of the pipe, or even its break under the effect of the pressure of the circulating fluid.
- the traditional methods consist first of excavating the material (sand, earth or the like) surrounding the deteriorated segments, then either to replace purely and simply the segments in question, which requires emptying the supply network beforehand, hence considerable inconvenience for the operation of the network, ie repairing the external surface of the conduct, when the latter has not yet yielded.
- the object of the present invention is in particular to improve the safety and reliability of the methods for repairing such pipes.
- a method for repairing a supply line for a pressurized fluid composed of a succession of buried pipe segments made of prestressed concrete comprises the following steps:
- the first and second portions of the pipe have a length substantially equal to half a length of pipe segment
- two shoes are positioned below the pipe, on either side of the soil material filling the excavation and parallel to the pipe, by placing a connection system between the hooves, and the connecting system is actuated to bring the hooves closer to each other and compress said soil material; to facilitate compaction, we can introduce needles in the interval between said shoes, and vibrating these needles during actuation of the linkage system;
- connection system comprises at least two metal strands connected to one of the shoes and passing through the other shoe, the actuation consisting, using at least one jack, of pulling on the ends of the strands which protrude of said other shoe by pressing against it;
- the reinforcement of the reinforcements placed around said portion is carried out up to a tension representing a fraction of a specified prestressing value; after filling said excavation and compacting the soil material, a partial backfilling of the trench is carried out in line with said portion so as to leave visible reinforcement blocking devices, an additional tension is applied to the reinforcements up to the specified prestressing value then the backfilling of the trench is completed; advantageously, the additional tension can be applied progressively during backfilling;
- FIG. 1 is an elevational view of a trench made in a first step of a method according to the invention for repairing a damaged pipe;
- FIGS. 2 and 3 are elevational views illustrating the process of setting up and tensioning reinforcements around portions of the pipe shown in Figure 1;
- FIG. 4 and 5 illustrate a process of additional tensioning of the frames of Figures 2 and 3;
- - Figure 6 is an elevational view of one end of the repaired area of the pipe
- - Figure 7 is a top view of a series of consecutive frames provided with their anchors
- FIG. 8 is a cross-sectional view of a portion of the pipe, under which is installed compression device of the soil.
- FIG. 1 there is shown a buried pipe 1 formed by a succession of pipe segments 2, 3, 4 assembled end to end.
- Figure 1 shows a certain length released by digging a trench in the ground.
- the pipe 1 is damaged, its skin having defects D previously detected by a known method, for example an acoustic method. Detection is not necessarily very precise.
- Digging the trench consists in removing the soil material on each side of the pipe 1 over a width sufficient to allow the intervention of human operators.
- the depth of the trench is slightly greater than that of the base of the pipe.
- care is taken not to remove the soil material present just below the pipe, so as to support the weight of the pipe loaded with water.
- the repairs carried out according to the invention do not generally require draining the pipe.
- the reduced pressure is calculated based on factors such as the topology of the ground, the total length of the trench, the nature of the defects found, etc. The reduction is carried out by working on the installations upstream of the area to be repaired.
- Each of the pipe segments consists of a concrete core, a diameter varying from approximately 0.5 m to 6 m, with or without an internal metal liner, and with an average unit length of approximately 7.5 m for example.
- segments 2, 3, 4 are intended to convey water under pressure, of the order of approximately 20 bars, and are buried or silted up for the most part or entirely. In this way, the surrounding soil exerts a back pressure on the outer walls of the segments 2, 3, 4.
- prestressing wires are wound in a spiral in one or two layers on their external face and tensioned during their winding.
- An additional layer of mortar or shotcrete covers these prestressing wires to protect them from corrosive agents possibly present in the soil.
- Each of the joints 5 between the segments 2, 3, 4 is formed by fitting a straight end of one of the adjacent segments in a widening provided at the end of the other segment, a sealing mortar being applied along the circumference of the joint.
- Line 1 thus constitutes a very rigid assembly which does not allow bending or shearing forces at the joints.
- Corrosion of the prestressing wires following the penetration of aggressive agents into the protective mortar layer, can lead to the breaking of one or more metallic wires. These ruptures are generally grouped in points of preferential penetration of aggressive agents, and lead to delamination and crumbling of the protective mortar layer, under the effect of shearing. These delaminations are the apparent defects D, which make repair necessary.
- an additional prestress is installed outside the pipe, using reinforcements 12 arranged around the pipe and distributed along the repaired area.
- These reinforcements are advantageously prestressed strands, and preferably individually sheathed strands, which improves their resistance to corrosion.
- the damaged area or areas should be cleaned up by mechanical treatment (brushing, hammering, pickling ...), possibly supplemented by a chemical treatment, in particular with a corrosion inhibiting agent. After these treatments, mortar is reapplied on the areas that have been scraped in order to equalize the surface of the pipe. To put the reinforcements around the pipe 1, it is necessary to make excavations under the pipe. To avoid this inducing undesirable longitudinal bending or shearing stresses at the joints, excavations are judiciously located.
- Second pipe portions 7 inserted between the first portions 6 and each included in a single pipe segment. These second portions 7 are centered on the midpoints of the segments.
- the length of these portions 6, 7 is of the order of half the length of a segment 2, 3, 4.
- the first portions 6 can be 3.5 m and the second portions 7 4 m.
- the strands 12 are engaged in the excavation so as to surround the pipe 1 over one or two turns. They are attached to the upper side of the pipe using a blocking device 11 (FIG. 7) adapted to receive the two ends of one or more of the strands 12.
- each strand 12 makes a single turn around the pipe
- the blocking devices 11 are generally X-shaped, with two curved channels intended to each receive one end of a strand.
- Each of its channels has a frustoconical mouth suitable for receiving a frustoconical anchoring jaw for blocking the end of the strand.
- To tension it put the jaws in place and pull on one of the protruding ends of the locking device 11 (or symmetrically on the two ends), using an actuator with a jack, pushing the bit towards the frustoconical mouth.
- Figure 2 there is shown a series of strands 12 placed around the pipe segments and tensioned symmetrically to avoid asymmetric stresses on the joints.
- the structural calculation defines a prestressing requirement per unit of length, which determines on the one hand a density of strands, in number of turns per meter of pipe, and on the other hand a tension setpoint of each strand.
- the strands 12 are placed with a substantially constant spacing between two neighboring strands, corresponding to the inverse of the number of turns per meter of pipe. As shown in FIG. 7, when this spacing is relatively small, the anchoring devices 11 can be staggered on the upper side of the pipe, to have room for them install and then equip them with the actuator.
- FIGS. 2 to 5 illustrate a possible course of the operations of setting up and tensioning the prestressing frames 12 around the pipe. It will be noted that these operations can also be carried out according to various other sequences.
- the tensioning procedure illustrated in Figure 2 is applied to reach only a fraction (for example 50%) of the voltage setpoint.
- This procedure is for example the following for each of the first portions 6: - a strand is first stretched over two strands in a forward movement from the joint 5 towards the second adjacent portions 7; then - the remaining strands are stretched in a return movement while returning towards the joint 5.
- return movements are illustrated by the arrows f1, f2 in FIG. 2.
- the next phase consists of filling the excavation formed under the first portion 6 with the soil material 9 which has been previously removed, then compacting this material under the pipe to form a heel locally restoring the seat of the pipe.
- connection system comprises metal strands 15, for example prestressing strands.
- Each of these strands 15 is connected to one of the shoes 14, for example using a spun sleeve 17 bearing against the edge of an orifice provided in this shoe 14 and crossed by the strand 15. Its other end passes through the opposite shoe 13 where a jack actuator 16 is positioned. This actuator 16 bears against this shoe 13 and is activated to pull on the protruding end of the strand 15.
- shoes 13 are added, 14 a vibrating system of the kind commonly used for vibrating concrete.
- This system comprises vibrating needles 19 which penetrate the layer of compacted ground by crossing the shoes 13, 14.
- the vibrations transmitted by these needles during the activation of the actuators 16, ensure a reduction in the vacuum rate of the material 9 and therefore an improvement of its settlement.
- the operating mode is similar to that described above for the first portions 6.
- the surface of the pipe in the area of the second portion 7, updated by excavation 8, is cleaned if necessary, then the reinforcements 12 are placed with the required spacing.
- the tensioning procedure illustrated in Figure 3 is applied to reach the same fraction (for example 50%) of the voltage setpoint. This procedure is as follows for one of the second portions 7:
- a strand is first stretched over two strands in a forward movement directed from the ends of the portion 7 towards its middle; then - the remaining strands are stretched in a return movement returning towards the ends.
- the excavation 8 is then filled with soil material which is compacted in the same manner as above.
- first portions 6 and by the arrows f 3 and f 4 in FIG. 5 (second portions 7).
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Piles And Underground Anchors (AREA)
Abstract
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/486,063 US7174920B2 (en) | 2001-08-07 | 2002-08-02 | Method for repairing pipes |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR01/10563 | 2001-08-07 | ||
| FR0110563A FR2828549B1 (fr) | 2001-08-07 | 2001-08-07 | Procede de reparation de conduites |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2003014614A1 true WO2003014614A1 (fr) | 2003-02-20 |
Family
ID=8866358
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/FR2002/002793 Ceased WO2003014614A1 (fr) | 2001-08-07 | 2002-08-02 | Procede de reparation de conduites |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US7174920B2 (fr) |
| FR (1) | FR2828549B1 (fr) |
| WO (1) | WO2003014614A1 (fr) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2852663A1 (fr) * | 2003-03-20 | 2004-09-24 | Freyssinet Int Stup | Procede de renforcement d'une conduite cylindrique, et plaque prefabriquee pour sa mise en oeuvre |
| FR2869971A1 (fr) * | 2004-05-05 | 2005-11-11 | Freyssinet Internat Stup Soc P | Procede de renforcement d'un tuyau cylindrique enterre |
| US7033114B2 (en) | 2003-03-20 | 2006-04-25 | Freyssinet International (Stup) | Method for installing reinforcements around a cylindrical underground pipeline |
| US8210226B2 (en) | 2006-04-20 | 2012-07-03 | Freyssinét | Method and machine for reinforcing an embedded cylindrical pipe |
| US9757599B2 (en) | 2014-09-10 | 2017-09-12 | Dymat Construction Products, Inc. | Systems and methods for fireproofing cables and other structural members |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014047041A1 (fr) * | 2012-09-21 | 2014-03-27 | Contech Engineered Solutions LLC | Système et procédé de plaque de chemisage de puits de mine à profil bas |
| US10612713B2 (en) * | 2017-03-14 | 2020-04-07 | Cowboy Acquisition, Llc | Fiber composite system and method for pipe reinforcement |
| US11209113B2 (en) | 2017-03-14 | 2021-12-28 | Csc Operating Company, Llc | Fiber composite system and method for pipe reinforcement |
| CN108824838A (zh) * | 2018-08-29 | 2018-11-16 | 中国水利水电科学研究院 | 预应力钢筒混凝土管体外预应力加固系统及其施工方法 |
| CN110397819B (zh) * | 2019-07-31 | 2021-11-05 | 南方工程检测修复技术研究院 | 一种断丝pccp不停水外贴预应力cfrp与高聚物注浆复合修复方法 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2247299A1 (fr) * | 1973-10-12 | 1975-05-09 | Heidemaatschappij Beheer Nv | |
| US4342338A (en) * | 1980-09-10 | 1982-08-03 | Jack M. Mitchell | Boot for sealing ruptured gas or water mains and tool for application |
| US5727907A (en) * | 1995-11-08 | 1998-03-17 | Silva; Jose De J. | Method for the reparation of submerged pipelines |
| FR2822177A1 (fr) | 2001-03-15 | 2002-09-20 | Freyssinet Int Stup | Dispositif d'ancrage pour armatures de precontrainte, systeme de precontrainte incluant le dispositif, et armature appropriee |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1534425A (en) * | 1923-04-07 | 1925-04-21 | Augustus H Stowell | Pipe joint |
| US1910594A (en) * | 1929-05-13 | 1933-05-23 | Mare Thomas De La | System for constructing pipe |
| US2627378A (en) * | 1949-06-16 | 1953-02-03 | Lock Joint Pipe Co | Method for securing a tensioned wire around cores |
| AU650423B2 (en) * | 1990-03-14 | 1994-06-23 | Norman C. Fawley | Method of and apparatus for reinforcing pipe |
| ATE189736T1 (de) * | 1992-09-09 | 2000-02-15 | Clock Spring Company L P | Verfahren zur reparatur von rohren |
| US5765600A (en) * | 1994-08-29 | 1998-06-16 | Gas Research Institute | Pipe designs using composite materials |
| US5527070A (en) * | 1995-04-05 | 1996-06-18 | Blackwell; William C. | Damage protection for in-ground pipe founded in expansive soils |
| US5988227A (en) * | 1998-03-20 | 1999-11-23 | Tuff-N-Nuff Industries | Protective shield for elongated underground utilities |
| US6543487B2 (en) * | 2001-02-08 | 2003-04-08 | Air Logistics Corporation | Method of securing a curing composite substrate wrap to a structure |
| FR2852662B1 (fr) * | 2003-03-20 | 2005-06-03 | Procede d'installation d'armatures de precontrainte autour d'une conduite cylindrique enterree |
-
2001
- 2001-08-07 FR FR0110563A patent/FR2828549B1/fr not_active Expired - Lifetime
-
2002
- 2002-08-02 WO PCT/FR2002/002793 patent/WO2003014614A1/fr not_active Ceased
- 2002-08-02 US US10/486,063 patent/US7174920B2/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2247299A1 (fr) * | 1973-10-12 | 1975-05-09 | Heidemaatschappij Beheer Nv | |
| US4342338A (en) * | 1980-09-10 | 1982-08-03 | Jack M. Mitchell | Boot for sealing ruptured gas or water mains and tool for application |
| US5727907A (en) * | 1995-11-08 | 1998-03-17 | Silva; Jose De J. | Method for the reparation of submerged pipelines |
| FR2822177A1 (fr) | 2001-03-15 | 2002-09-20 | Freyssinet Int Stup | Dispositif d'ancrage pour armatures de precontrainte, systeme de precontrainte incluant le dispositif, et armature appropriee |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2852663A1 (fr) * | 2003-03-20 | 2004-09-24 | Freyssinet Int Stup | Procede de renforcement d'une conduite cylindrique, et plaque prefabriquee pour sa mise en oeuvre |
| US7033114B2 (en) | 2003-03-20 | 2006-04-25 | Freyssinet International (Stup) | Method for installing reinforcements around a cylindrical underground pipeline |
| US7347227B2 (en) | 2003-03-20 | 2008-03-25 | Freyssinet International (Stup) | Method of reinforcing a cylindrical pipeline and prefabricated plate used in such method |
| FR2869971A1 (fr) * | 2004-05-05 | 2005-11-11 | Freyssinet Internat Stup Soc P | Procede de renforcement d'un tuyau cylindrique enterre |
| US7267507B2 (en) | 2004-05-05 | 2007-09-11 | Freyssinet International (Stup) | Method of reinforcing an embedded cylindrical pipe |
| US8210226B2 (en) | 2006-04-20 | 2012-07-03 | Freyssinét | Method and machine for reinforcing an embedded cylindrical pipe |
| US9757599B2 (en) | 2014-09-10 | 2017-09-12 | Dymat Construction Products, Inc. | Systems and methods for fireproofing cables and other structural members |
| US10512803B2 (en) | 2014-09-10 | 2019-12-24 | Dymat Construction Products, Inc. | Systems and methods for fireproofing cables and other structural members |
| US11465002B2 (en) | 2014-09-10 | 2022-10-11 | Dymat Construction Products, Inc. | Systems and methods for fireproofing cables and other structural members |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2828549A1 (fr) | 2003-02-14 |
| US7174920B2 (en) | 2007-02-13 |
| US20040231740A1 (en) | 2004-11-25 |
| FR2828549B1 (fr) | 2003-10-31 |
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