US3792204A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustic transducer using a piezoelectric polyvinylidene fluoride resin film as the oscillator
Assignee: Kureha Corp
•
Filing: 1971-12-03
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Granted: 1974-02-12
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Expires: 1991-12-03
Abstract
Abstract An electrostatic type, electroacoustic transducer having excellent acoustic characteristics is composed of an piezoelectric film of a polyvinylidene fluorine resin having an electroconductive material on the opposite surfaces of the film.
Inventors
- 👤 N Murayama
- 👤 T Okiawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:25
CPC Classifications
H; H04; H04R; H04R17/00; H04R17/005; H01; H01G; H01G7/00; H01G7/02; H01G7/021; H01G7/023; H04R19/00; H04R19/01; H10; H10N; H10N30/00; H10N30/80; H10N30/85; H10N30/857; Y; Y10; Y10S; Y10S310/00; Y10S310/80
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
18 words
The electrostatic type acoustic transducer as claimed in claim 1 wherein said vinylidene fluoride resin is polyvinylidene fluoride.
Claim 2
Dependent Claim
23 words
The electrostatic type acoustic transducer as claimed in claim 1 wherein said vinylidene fluoride resin is a copolymer of vinylidene fluoride and tetrafluoroethylene.
Claim 3
Dependent Claim
19 words
The electrostatic type acoustic transducer as claimed in claim 1 wherein the film of said vinylidene fluoride is non-oriented.
Claim 4
Dependent Claim
20 words
The electrostatic type acoustic transducer as claimed in claim 1 wherein the film of said vinylidene fluoride resin is oriented.
Claim 5
Dependent Claim
16 words
The electrostatic type acoustic transducer as claimed in claim 1 wherein said conductive material is aluminum.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |