NL166835C - ELECTRO-ACOUSTIC CONVERTER WITH ELECTRET, AND METHOD FOR MANUFACTURING THE SAME - Google Patents

ELECTRO-ACOUSTIC CONVERTER WITH ELECTRET, AND METHOD FOR MANUFACTURING THE SAME

Info

Publication number: NL166835C
Authority: NL; Netherlands
Prior art keywords: electret; electro; manufacturing; same; acoustic converter
Prior art date: 1971-11-08

Application number

NL7214357A

Other languages

Dutch (nl)

Other versions

NL166835B (en

NL7214357A (en

Original Assignee

Industrial Research Prod 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.)

1971-11-08

Filing date

1972-10-24

Publication date

1981-09-15

1972-10-24 Application filed by Industrial Research Prod Inc filed Critical Industrial Research Prod Inc

1973-05-10 Publication of NL7214357A publication Critical patent/NL7214357A/xx

1981-04-15 Publication of NL166835B publication Critical patent/NL166835B/en

1981-09-15 Application granted granted Critical

1981-09-15 Publication of NL166835C publication Critical patent/NL166835C/en

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)

NL7214357A 1971-11-08 1972-10-24 ELECTRO-ACOUSTIC CONVERTER WITH ELECTRET, AND METHOD FOR MANUFACTURING THE SAME NL166835C (en)

Applications Claiming Priority (2)

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

Publications (3)

Publication Number	Publication Date
NL7214357A NL7214357A (en)	1973-05-10
NL166835B NL166835B (en)	1981-04-15
NL166835C true NL166835C (en)	1981-09-15

Family

ID=26892043

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
NL7214357A NL166835C (en)	1971-11-08	1972-10-24	ELECTRO-ACOUSTIC CONVERTER WITH ELECTRET, AND METHOD FOR MANUFACTURING THE SAME

Country Status (7)

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

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

1972
- 1972-09-12 SE SE1173072A patent/SE378500B/xx unknown
- 1972-10-04 CH CH1445572A patent/CH556628A/en not_active IP Right Cessation
- 1972-10-16 GB GB4755972A patent/GB1398171A/en not_active Expired
- 1972-10-24 NL NL7214357A patent/NL166835C/en not_active IP Right Cessation
- 1972-11-08 FR FR7239548A patent/FR2159372B1/fr not_active Expired
- 1972-11-08 DK DK554172AA patent/DK140578B/en unknown
- 1972-11-08 JP JP11198672A patent/JPS5148067B2/ja not_active Expired

Also Published As

Publication number	Publication date
DE2254692A1 (en)	1973-05-10
JPS4859824A (en)	1973-08-22
FR2159372A1 (en)	1973-06-22
CH556628A (en)	1974-11-29
DK140578C (en)	1980-02-18
JPS5148067B2 (en)	1976-12-18
GB1398171A (en)	1975-06-18
FR2159372B1 (en)	1977-08-26
NL166835B (en)	1981-04-15
SE378500B (en)	1975-09-01
NL7214357A (en)	1973-05-10
DE2254692B2 (en)	1976-08-05
DK140578B (en)	1979-10-01

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Legal Events

Date	Code	Title	Description
1990-12-17	SNR	Assignments of patents or rights arising from examined patent applications	Owner name: KNOWLES ELECTRONICS, INC.
1992-11-16	V4	Lapsed because of reaching the maxim lifetime of a patent