US3761956A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound generating device
Assignee: Nittan Co Ltd
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Filing: 1971-09-20
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Granted: 1973-09-25
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Expires: 1991-09-20
Abstract
Abstract A piezoelectric sound generator having a diaphragm carrying the piezoelectric element and at least one resonant chamber spaced from said diaphragm with the wall of said chamber being coincident with a node circle on the diaphragm.
Inventors
- 👤 N Takahashi
- 👤 H Mori
- 👤 H Ueki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:37
CPC Classifications
H; H04; H04R; H04R7/00; H04R7/16; H04R17/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
A sound generating device comprising a diaphragm, a piezoelectric electromechanical transducing element attached to said diaphragm, means supporting said diaphragm at one of node circles of vibration formed on said diaphragm, a cylindrical resonance chamber positioned in closely spaced relationship to one side of said diaphragm and consisting of a plurality of resonance cavities having cylindrical walls arranged concentrically and having diameters substantially equal to the diameters of said node circles respectively, the cylindrical walls of said resonance cavities being disposed in coincidence with said node circles respectively and diaphragm supporting means extending from one edge of a wall of one of said cavities, said supporting means being aligned with a node circle and carrying said diaphragm.
Claim 2
Dependent Claim
117 words
A sound generating device comprising a diaphragm, a piezoelectric electromechanical transducing element attached to said diaphragm, means supporting said diaphragm at one of node circles of vibration formed on said diaphragm, a cylindrical resonance chamber positioned in closely spaced relationship to one side of said diaphragm and consisting of a plurality of resonance cavities having cylindrical walls arranged concentrically and having diameters substantially equal to the diameters of said node circles respectively, the cylindrical walls of said resonance cavities being disposed in coincidence with said node circles respectively and diaphragm supporting means extending from one edge of a wall of one of said cavities, said supporting means being aligned with a node circle and carrying said diaphragm.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |