CH558626A - CHARCOAL MICROPHONE, IN PARTICULAR FOR TELEPHONE APPARATUS. - Google Patents

CHARCOAL MICROPHONE, IN PARTICULAR FOR TELEPHONE APPARATUS.

Info

Publication number: CH558626A
Authority: CH; Switzerland
Prior art keywords: charcoal; microphone; telephone apparatus; telephone; charcoal microphone
Prior art date: 1972-11-24

Application number

CH1640273A

Other languages

German (de)

Original Assignee

Int Standard Electric Corp

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.)

1972-11-24

Filing date

1973-11-20

Publication date

1975-01-31

1973-11-20 Application filed by Int Standard Electric Corp filed Critical Int Standard Electric Corp

1975-01-31 Publication of CH558626A publication Critical patent/CH558626A/en

Links

Classifications

- 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

Physics & Mathematics (AREA)
Engineering & Computer Science (AREA)
Acoustics & Sound (AREA)
Signal Processing (AREA)
Lubricants (AREA)
Diaphragms For Electromechanical Transducers (AREA)
Telephone Set Structure (AREA)
Compositions Of Macromolecular Compounds (AREA)
Carbon And Carbon Compounds (AREA)

CH1640273A 1972-11-24 1973-11-20 CHARCOAL MICROPHONE, IN PARTICULAR FOR TELEPHONE APPARATUS. CH558626A (en)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
GB5431472A GB1360559A (en)	1972-11-24	1972-11-24	Carbon microphone

Publications (1)

Publication Number	Publication Date
CH558626A true CH558626A (en)	1975-01-31

Family

ID=10470609

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
CH1640273A CH558626A (en)	1972-11-24	1973-11-20	CHARCOAL MICROPHONE, IN PARTICULAR FOR TELEPHONE APPARATUS.

Country Status (15)

Country	Link
US (1)	US3859478A (en)
JP (1)	JPS4984430A (en)
AR (1)	AR199010A1 (en)
AT (1)	ATA982873A (en)
AU (1)	AU6192973A (en)
BE (1)	BE807626A (en)
BR (1)	BR7308746D0 (en)
CA (1)	CA995349A (en)
CH (1)	CH558626A (en)
DE (1)	DE2358243A1 (en)
ES (1)	ES420820A1 (en)
FR (1)	FR2208266B3 (en)
GB (1)	GB1360559A (en)
IT (1)	IT1001915B (en)
NL (1)	NL7315631A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US5541570A (en) *	1994-12-09	1996-07-30	Force Imaging Technologies, Inc.	Force sensing ink, method of making same and improved force sensor

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US486244A (en) *		1892-11-15		Charles clamond
US919908A (en) *	1908-07-13	1909-04-27	Harold Sheen Martin	Electrical-resistance device.
US1086726A (en) *	1909-03-11	1914-02-10	Johan Burchardt Opsahl	Resistance unit.

1972
- 1972-11-24 GB GB5431472A patent/GB1360559A/en not_active Expired
1973
- 1973-09-21 US US399598A patent/US3859478A/en not_active Expired - Lifetime
- 1973-10-29 AU AU61929/73A patent/AU6192973A/en not_active Expired
- 1973-11-08 BR BR8746/73A patent/BR7308746D0/en unknown
- 1973-11-14 NL NL7315631A patent/NL7315631A/xx unknown
- 1973-11-16 CA CA186,005A patent/CA995349A/en not_active Expired
- 1973-11-20 CH CH1640273A patent/CH558626A/en not_active IP Right Cessation
- 1973-11-22 AR AR251115A patent/AR199010A1/en active
- 1973-11-22 BE BE2053233A patent/BE807626A/en unknown
- 1973-11-22 JP JP48130831A patent/JPS4984430A/ja active Pending
- 1973-11-22 IT IT31620/73A patent/IT1001915B/en active
- 1973-11-22 DE DE2358243A patent/DE2358243A1/en active Pending
- 1973-11-23 AT AT982873A patent/ATA982873A/en not_active Application Discontinuation
- 1973-11-23 FR FR7341721A patent/FR2208266B3/fr not_active Expired
- 1973-11-24 ES ES420820A patent/ES420820A1/en not_active Expired

Also Published As

Publication number	Publication date
ES420820A1 (en)	1976-04-01
US3859478A (en)	1975-01-07
FR2208266B3 (en)	1976-10-08
AU6192973A (en)	1975-05-01
JPS4984430A (en)	1974-08-14
ATA982873A (en)	1976-05-15
FR2208266A1 (en)	1974-06-21
BE807626A (en)	1974-05-22
GB1360559A (en)	1974-07-17
AR199010A1 (en)	1974-07-31
IT1001915B (en)	1976-04-30
BR7308746D0 (en)	1974-08-22
DE2358243A1 (en)	1974-05-30
NL7315631A (en)	1974-05-28
CA995349A (en)	1976-08-17

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NO134819C (en)	1991-03-25	TELEPHONE APPARATUS.

Legal Events

Date	Code	Title	Description
1976-06-30	PL	Patent ceased