US2673948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystal device for controlling electric currents by means of a solid semiconductor
Assignee: Compagnie des Freins et Signaux Westinghouse SA
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Filing: 1949-08-11
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Granted: 1954-03-30
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Expires: 1969-08-11
Abstract
No abstract record available.
Inventors
- 👤 Matare Herbert Francois
- 👤 Welker Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:31
CPC Classifications
H; H10; H10D; H10D48/00; H10D48/01; H10D48/04; H01; H01H; H01H47/00; H01H47/22; H01H47/32; H01J; H01J17/00; H01J17/38; H01J17/40; H10D99/00; H10P; H10P95/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US837616A
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US1949383A
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US2328440A
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US2555001A
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US2552052A
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US2524035A
Cited
US2476323A
Cited
US2569347A
Cited
US2502479A
Cited
US2538593A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-29 | 1957-09-28 | 1958-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-29 | 1961-09-28 | 1962-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-29 | 1965-09-28 | 1966-03-30 | $7700.00 | Window Closed / Lapsed |