US3721840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound generator
Assignee: Nittan Co Ltd
•
Filing: 1971-09-14
•
Granted: 1973-03-20
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Expires: 1991-09-14
Abstract
Abstract A sound generator having a relatively thin diaphragm and a piezoelectric disc element with electrodes bonded to opposing sides thereof adhered to one side of said diaphragm and means supporting the edge of said diaphragm.
Inventors
- 👤 H Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:15
CPC Classifications
H; H04; H04R; H04R17/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
A sound generator comprising a piezoelectric disc having opposing faces, an electrode electrically connected to each face of said disc with one of said electrodes being in the form of a disc having a diameter greater than said piezoelectric disc, a thin circular synthetic resin plate having a central circular opening of a diameter greater than the diameter of said piezoelectric disc and smaller than said electrode disc, and means securing said electrode disc in overlying relationship to said opening with the piezoelectric disc disposed concentrically of said opening.
Claim 2
Dependent Claim
89 words
A sound generator comprising a piezoelectric disc having opposing faces, an electrode electrically connected to each face of said disc with one of said electrodes being in the form of a disc having a diameter greater than said piezoelectric disc, a thin circular synthetic resin plate having a central circular opening of a diameter greater than the diameter of said piezoelectric disc and smaller than said electrode disc, and means securing said electrode disc in overlying relationship to said opening with the piezoelectric disc disposed concentrically of said opening.
References Cited (Backward Citations)
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US3206558A
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US3222462A
Cited
US3271596A
Cited
US3427481A
Cited
US3423543A
Cited
US3439128A
Cited
US3683129A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |