US2731561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystal contact devices
Assignee: The General Electric Company PLC
•
Filing: 1950-02-08
•
Granted: 1956-01-17
•
Expires: 1970-02-08
Abstract
No abstract record available.
Inventors
- 👤 James Emrys Gwynne
- 👤 Lindell Aubrey Oscar Edgar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:23
CPC Classifications
H; H10; H10D; H10D99/00; H10D64/00; H10D64/20; H10D64/23
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2378944A
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US2460109A
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US2427087A
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US2419613A
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US2423390A
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US2491971A
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FR970555A
Cited
US2563613A
Cited
US2484256A
Cited
US2673930A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-16 | 1959-07-18 | 1960-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-16 | 1963-07-18 | 1964-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-16 | 1967-07-18 | 1968-01-17 | $7700.00 | Window Closed / Lapsed |