US2276647A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of copper-oxide rectifiers
Assignee: Westinghouse Electric Corp
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Filing: 1938-12-22
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Granted: 1942-03-17
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Expires: 1958-12-22
Abstract
No abstract record available.
Inventors
- 👤 Conrad Frank
- 👤 Earl D Wilson
- 👤 Carl C Hein
- 👤 Floyd T Hague
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:38
CPC Classifications
H; H10; H10D; H10D48/00; H10D48/01; H10D48/07; H10D48/071; H10D48/074; H10P; H10P14/00; H10P14/20; H10P14/203; H10P14/34; H10P14/3402; H10P14/3434
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1945-03-16 | 1945-09-15 | 1946-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-03-16 | 1949-09-15 | 1950-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-03-16 | 1953-09-15 | 1954-03-17 | $7700.00 | Window Closed / Lapsed |