US2683840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconductor for control purposes
Assignee: Compagnie des Freins et Signaux Westinghouse SA
•
Filing: 1949-10-05
•
Granted: 1954-07-13
•
Expires: 1969-10-05
Abstract
No abstract record available.
Inventors
- 👤 Welker Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:23
CPC Classifications
H; H10; H10D; H10D99/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2563503A
Cited
US1745175A
Cited
US1900018A
Cited
GB342643A
Cited
GB500344A
Cited
US2517960A
Cited
US2476323A
Cited
US2502479A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-07-12 | 1958-01-11 | 1958-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-12 | 1962-01-11 | 1962-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-12 | 1966-01-11 | 1966-07-13 | $7700.00 | Window Closed / Lapsed |