Patent US2829284A successfully refreshed from Google Patents.
US2829284A
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US
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Stable piezoelectric crystals
Assignee: Individual
•
Filing: 1953-11-04
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Granted: 1958-04-01
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Expires: 1973-11-04
Abstract
No abstract record available.
Inventors
- 👤 Eduard A Gerber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:10
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/15; H03H9/17; H01; H01J; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J31/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2047387A
Cited
US2249933A
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US2229172A
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US2467353A
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US2454769A
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US2457563A
Cited
US2434266A
Cited
US2487165A
Cited
US2509478A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-31 | 1961-09-30 | 1962-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-31 | 1965-09-30 | 1966-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-31 | 1969-09-30 | 1970-04-01 | $7700.00 | Window Closed / Lapsed |