FR2159372B1 - - Google Patents

Info

Publication number
FR2159372B1
FR2159372B1 FR7239548A FR7239548A FR2159372B1 FR 2159372 B1 FR2159372 B1 FR 2159372B1 FR 7239548 A FR7239548 A FR 7239548A FR 7239548 A FR7239548 A FR 7239548A FR 2159372 B1 FR2159372 B1 FR 2159372B1
Authority
FR
France
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
FR7239548A
Other versions
FR2159372A1 (fr
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.)
Industrial Research Products Inc
Original Assignee
Industrial Research Products Inc
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 Industrial Research Products Inc filed Critical Industrial Research Products Inc
Publication of FR2159372A1 publication Critical patent/FR2159372A1/fr
Application granted granted Critical
Publication of FR2159372B1 publication Critical patent/FR2159372B1/fr
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
    • H04R19/00—Electrostatic transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R19/00—Electrostatic transducers
    • H04R19/01—Electrostatic transducers characterised by the use of electrets
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2207/00—Details of diaphragms or cones for electromechanical transducers or their suspension covered by H04R7/00 but not provided for in H04R7/00 or in H04R2307/00
    • H04R2207/021—Diaphragm extensions, not necessarily integrally formed, e.g. skirts, rims, flanges

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
FR7239548A 1971-11-08 1972-11-08 Expired FR2159372B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US19659271A 1971-11-08 1971-11-08
US19667771A 1971-11-08 1971-11-08

Publications (2)

Publication Number Publication Date
FR2159372A1 FR2159372A1 (fr) 1973-06-22
FR2159372B1 true FR2159372B1 (fr) 1977-08-26

Family

ID=26892043

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7239548A Expired FR2159372B1 (fr) 1971-11-08 1972-11-08

Country Status (7)

Country Link
JP (1) JPS5148067B2 (fr)
CH (1) CH556628A (fr)
DK (1) DK140578B (fr)
FR (1) FR2159372B1 (fr)
GB (1) GB1398171A (fr)
NL (1) NL166835C (fr)
SE (1) SE378500B (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57188105A (en) * 1981-05-14 1982-11-19 Toshiba Corp Electret constituent

Also Published As

Publication number Publication date
CH556628A (de) 1974-11-29
FR2159372A1 (fr) 1973-06-22
DE2254692A1 (de) 1973-05-10
GB1398171A (en) 1975-06-18
NL166835C (nl) 1981-09-15
JPS5148067B2 (fr) 1976-12-18
NL7214357A (fr) 1973-05-10
JPS4859824A (fr) 1973-08-22
DE2254692B2 (de) 1976-08-05
NL166835B (nl) 1981-04-15
DK140578C (fr) 1980-02-18
SE378500B (fr) 1975-09-01
DK140578B (da) 1979-10-01

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Legal Events

Date Code Title Description
TP Transmission of property
ST Notification of lapse