FR555456A - Perfectionnements apportés aux transmetteurs téléphoniques - Google Patents

Perfectionnements apportés aux transmetteurs téléphoniques

Info

Publication number: FR555456A
Authority: FR; France
Prior art keywords: telephone transmitters; transmitters; telephone
Prior art date: 1921-10-03
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.): Expired

Application number

Other languages

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.)

Thales SA

Original Assignee

Le Materiel Telephonique Thomson CSF

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.)

1921-10-03

Filing date

1922-08-28

Publication date

1923-06-30

1922-08-28 Application filed by Le Materiel Telephonique Thomson CSF filed Critical Le Materiel Telephonique Thomson CSF

1923-06-30 Application granted granted Critical

1923-06-30 Publication of FR555456A publication Critical patent/FR555456A/fr

Status Expired legal-status Critical Current

Classifications

- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/26—Damping by means acting directly on free portion of diaphragm or cone
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/222—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only for microphones
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R21/00—Variable-resistance transducers
- H04R21/02—Microphones
- H04R21/021—Microphones with granular resistance material

Landscapes

Engineering & Computer Science (AREA)
Signal Processing (AREA)
Physics & Mathematics (AREA)
Acoustics & Sound (AREA)
Otolaryngology (AREA)
Health & Medical Sciences (AREA)
Multimedia (AREA)
Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Vibration Prevention Devices (AREA)
Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Diaphragms For Electromechanical Transducers (AREA)
Electrotherapy Devices (AREA)
Interconnected Communication Systems, Intercoms, And Interphones (AREA)
Telephone Set Structure (AREA)

FR555456D 1921-10-03 1922-08-28 Perfectionnements apportés aux transmetteurs téléphoniques Expired FR555456A (fr)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
US505059A US1583416A (en)	1921-10-03	1921-10-03	Vibration-responsive apparatus

Publications (1)

Publication Number	Publication Date
FR555456A true FR555456A (fr)	1923-06-30

Family

ID=24008826

Family Applications (3)

Application Number	Title	Priority Date	Filing Date
FR555456D Expired FR555456A (fr)	1921-10-03	1922-08-28	Perfectionnements apportés aux transmetteurs téléphoniques
FR27035D Expired FR27035E (fr)	1921-10-03	1922-10-31	Perfectionnements apportés aux transmetteurs téléphoniques
FR33679D Expired FR33679E (fr)	1921-10-03	1927-06-14	Perfectionnements apportés aux transmetteurs téléphoniques

Family Applications After (2)

Application Number	Title	Priority Date	Filing Date
FR27035D Expired FR27035E (fr)	1921-10-03	1922-10-31	Perfectionnements apportés aux transmetteurs téléphoniques
FR33679D Expired FR33679E (fr)	1921-10-03	1927-06-14	Perfectionnements apportés aux transmetteurs téléphoniques

Country Status (6)

Country	Link
US (2)	US1583416A (fr)
CH (2)	CH102427A (fr)
DE (1)	DE497111C (fr)
FR (3)	FR555456A (fr)
GB (3)	GB186896A (fr)
NL (2)	NL13005C (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
BE483732A (fr) *	1944-05-03
US2500541A (en) *	1945-07-18	1950-03-14	Emil H Greibach	Inertia-type electromechanical sound transducing device
US2527159A (en) *	1947-04-26	1950-10-24	Bell Telephone Labor Inc	Telephone transmitter with radial slots in the carbon chamber
US2567368A (en) *	1949-06-09	1951-09-11	Bell Telephone Labor Inc	Telephone transmitter

1921
- 1921-10-03 US US505059A patent/US1583416A/en not_active Expired - Lifetime
- 1921-10-03 US US505060A patent/US1565581A/en not_active Expired - Lifetime
1922
- 1922-07-03 NL NL22431A patent/NL13005C/xx active
- 1922-07-06 GB GB18572/22A patent/GB186896A/en not_active Expired
- 1922-08-28 FR FR555456D patent/FR555456A/fr not_active Expired
- 1922-08-28 CH CH102427D patent/CH102427A/fr unknown
- 1922-09-04 GB GB23945/22A patent/GB204859A/en not_active Expired
- 1922-09-07 NL NL22802A patent/NL13022C/xx active
- 1922-10-04 DE DEW62201D patent/DE497111C/de not_active Expired
- 1922-10-31 FR FR27035D patent/FR27035E/fr not_active Expired
- 1922-10-31 CH CH102428D patent/CH102428A/fr unknown
- 1922-10-31 GB GB13568/27A patent/GB295751A/en not_active Expired
1927
- 1927-06-14 FR FR33679D patent/FR33679E/fr not_active Expired

Also Published As

Publication number	Publication date
US1565581A (en)	1925-12-15
FR27035E (fr)	1924-03-26
GB204859A (en)	1923-10-11
GB186896A (en)	1923-06-28
NL13005C (fr)	1925-05-15
CH102428A (fr)	1923-12-01
US1583416A (en)	1926-05-04
CH102427A (fr)	1923-12-01
DE497111C (de)	1930-05-02
FR33679E (fr)	1928-11-29
GB295751A (en)	1928-08-20
NL13022C (fr)	1925-05-15

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