GB233763A - Improvements in microphones - Google Patents

Improvements in microphones

Info

Publication number
GB233763A
GB233763A GB348524A GB348524A GB233763A GB 233763 A GB233763 A GB 233763A GB 348524 A GB348524 A GB 348524A GB 348524 A GB348524 A GB 348524A GB 233763 A GB233763 A GB 233763A
Authority
GB
United Kingdom
Prior art keywords
drawings
microphones
parent specification
thermo
feb
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
GB348524A
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.)
Individual
Original Assignee
Individual
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
Priority to US665136A priority Critical patent/US1588169A/en
Priority to GB2499123A priority patent/GB227173A/en
Priority to FR572044D priority patent/FR572044A/en
Priority to US672324A priority patent/US1588170A/en
Application filed by Individual filed Critical Individual
Priority to GB348524A priority patent/GB233763A/en
Publication of GB233763A publication Critical patent/GB233763A/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
    • H04R23/00—Transducers other than those covered by groups H04R9/00 - H04R21/00
    • H04R23/002—Transducers other than those covered by groups H04R9/00 - H04R21/00 using electrothermic-effect transducer

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)
  • Glass Compositions (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Photoreceptors In Electrophotography (AREA)

Abstract

233,763. Case, T. W. Feb. 11, 1924. Addition to 227,173. Drawings to Specification. Thermal and thermo-electric instruments.- The current of gas to which the heated resistance of a microphone as claimed in the parent Specification is exposed consists of hydrogen. The detailed description and drawings are identical with those of the parent Specification.
GB348524A 1923-09-27 1924-02-11 Improvements in microphones Expired GB233763A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US665136A US1588169A (en) 1923-09-27 1923-09-27 Microphone
GB2499123A GB227173A (en) 1924-02-11 1923-10-08 Improvements in and relating to apparatus for converting sound waves into variationsof electric current
FR572044D FR572044A (en) 1924-02-11 1923-10-18 Air thermo-microphone
US672324A US1588170A (en) 1923-11-02 1923-11-02 Method and apparatus for translating sound wave variations
GB348524A GB233763A (en) 1924-02-11 1924-02-11 Improvements in microphones

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB348524A GB233763A (en) 1924-02-11 1924-02-11 Improvements in microphones

Publications (1)

Publication Number Publication Date
GB233763A true GB233763A (en) 1925-05-11

Family

ID=9759203

Family Applications (2)

Application Number Title Priority Date Filing Date
GB2499123A Expired GB227173A (en) 1924-02-11 1923-10-08 Improvements in and relating to apparatus for converting sound waves into variationsof electric current
GB348524A Expired GB233763A (en) 1923-09-27 1924-02-11 Improvements in microphones

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB2499123A Expired GB227173A (en) 1924-02-11 1923-10-08 Improvements in and relating to apparatus for converting sound waves into variationsof electric current

Country Status (2)

Country Link
FR (1) FR572044A (en)
GB (2) GB227173A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2346757B (en) * 1984-09-12 2001-02-21 Raytheon Co Transducer

Also Published As

Publication number Publication date
GB227173A (en) 1925-01-08
FR572044A (en) 1924-05-28

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