US2886787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piezoelectric device
Assignee: DONALD E JOHNSON
•
Filing: 1953-07-30
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Granted: 1959-05-12
•
Expires: 1973-07-30
Abstract
No abstract record available.
Inventors
- 👤 Jr Samuel L Broadhead
- 👤 Jr William H Ashley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:50
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; H03H9/54; H03H9/56; H03H9/545
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR748910A
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US2159891A
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US2240293A
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US2306909A
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US2271870A
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US2308397A
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US2277709A
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US2292885A
Cited
US2292886A
Cited
US2309467A
Cited
US2510811A
Cited
US2779191A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-05-11 | 1962-11-10 | 1963-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-11 | 1966-11-10 | 1967-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-11 | 1970-11-10 | 1971-05-12 | $7700.00 | Window Closed / Lapsed |