Patent US3423542A successfully refreshed from Google Patents.
US3423542A
Expired / Lapsed
US
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Tapered fingers for resonant peak damping in piezoelectric transducers
Assignee: Astatic Corp
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Filing: 1965-01-28
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Granted: 1969-01-21
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Expires: 1985-01-28
Abstract
No abstract record available.
Inventors
- 👤 Henry J Cvetko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:55
CPC Classifications
H; H04; H04R; H04R17/00; H04R17/04; H04R1/00; H04R1/16
Claims Analysis
Total Claims: 0
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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) | 1972-01-21 | 1972-07-22 | 1973-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-21 | 1976-07-22 | 1977-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-21 | 1980-07-22 | 1981-01-21 | $7700.00 | Window Closed / Lapsed |