GB1360559A - Carbon microphone - Google Patents

Carbon microphone

Info

Publication number
GB1360559A
GB1360559A GB5431472A GB5431472A GB1360559A GB 1360559 A GB1360559 A GB 1360559A GB 5431472 A GB5431472 A GB 5431472A GB 5431472 A GB5431472 A GB 5431472A GB 1360559 A GB1360559 A GB 1360559A
Authority
GB
United Kingdom
Prior art keywords
carbon
carbon microphone
particles
microphone
heading
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.)
Expired
Application number
GB5431472A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB5431472A priority Critical patent/GB1360559A/en
Priority to US399598A priority patent/US3859478A/en
Priority to AU61929/73A priority patent/AU6192973A/en
Priority to BR8746/73A priority patent/BR7308746D0/en
Priority to NL7315631A priority patent/NL7315631A/xx
Priority to CA186,005A priority patent/CA995349A/en
Priority to CH1640273A priority patent/CH558626A/en
Priority to IT31620/73A priority patent/IT1001915B/en
Priority to JP48130831A priority patent/JPS4984430A/ja
Priority to DE2358243A priority patent/DE2358243A1/en
Priority to BE2053233A priority patent/BE807626A/en
Priority to AR251115A priority patent/AR199010A1/en
Priority to FR7341721A priority patent/FR2208266B3/fr
Priority to AT982873A priority patent/ATA982873A/en
Priority to ES420820A priority patent/ES420820A1/en
Publication of GB1360559A publication Critical patent/GB1360559A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; 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)
  • Telephone Set Structure (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Carbon And Carbon Compounds (AREA)

Abstract

1360559 Carbon granule microphones STANDARD TELEPHONES & CABLES Ltd 24 Nov 1972 54314/72 Heading H4J A carbon microphone has a mixture of carbon granules and up to 2% of aggregated particles, forming masses 1 to 10 microns in size, of a dry powder lubricant. Preferably the particles are of silica material and constitute about 1% of the total.
GB5431472A 1972-11-24 1972-11-24 Carbon microphone Expired GB1360559A (en)

Priority Applications (15)

Application Number Priority Date Filing Date Title
GB5431472A GB1360559A (en) 1972-11-24 1972-11-24 Carbon microphone
US399598A US3859478A (en) 1972-11-24 1973-09-21 Carbon microphone
AU61929/73A AU6192973A (en) 1972-11-24 1973-10-29 Carbon microphone
BR8746/73A BR7308746D0 (en) 1972-11-24 1973-11-08 COAL MICROPHONE
NL7315631A NL7315631A (en) 1972-11-24 1973-11-14
CA186,005A CA995349A (en) 1972-11-24 1973-11-16 Carbon microphone
CH1640273A CH558626A (en) 1972-11-24 1973-11-20 CHARCOAL MICROPHONE, IN PARTICULAR FOR TELEPHONE APPARATUS.
IT31620/73A IT1001915B (en) 1972-11-24 1973-11-22 CHARCOAL MICROPHONE
JP48130831A JPS4984430A (en) 1972-11-24 1973-11-22
DE2358243A DE2358243A1 (en) 1972-11-24 1973-11-22 CHARCOAL MICROPHONE
BE2053233A BE807626A (en) 1972-11-24 1973-11-22 CARBON MICROPHONE
AR251115A AR199010A1 (en) 1972-11-24 1973-11-22 CARBON MICROPHONE
FR7341721A FR2208266B3 (en) 1972-11-24 1973-11-23
AT982873A ATA982873A (en) 1972-11-24 1973-11-23 FULL SIZE FOR A COAL MICROPHONE
ES420820A ES420820A1 (en) 1972-11-24 1973-11-24 Carbon microphone

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
GB1360559A true GB1360559A (en) 1974-07-17

Family

ID=10470609

Family Applications (1)

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

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.

Also Published As

Publication number Publication date
IT1001915B (en) 1976-04-30
AR199010A1 (en) 1974-07-31
NL7315631A (en) 1974-05-28
ES420820A1 (en) 1976-04-01
CA995349A (en) 1976-08-17
JPS4984430A (en) 1974-08-14
ATA982873A (en) 1976-05-15
FR2208266A1 (en) 1974-06-21
BR7308746D0 (en) 1974-08-22
DE2358243A1 (en) 1974-05-30
AU6192973A (en) 1975-05-01
FR2208266B3 (en) 1976-10-08
CH558626A (en) 1975-01-31
US3859478A (en) 1975-01-07
BE807626A (en) 1974-05-22

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Legal Events

Date Code Title Description
414F Notice of opposition given (sect. 14/1949)
414E Application relinquished (sect. 14/1949)
CSNS Application of which complete specification have been accepted and published, but patent is not sealed