US2437995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selenium rectifiers
Assignee: Westinghouse Electric Corp
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Filing: 1943-11-10
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Granted: 1948-03-16
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Expires: 1963-11-10
Abstract
No abstract record available.
Inventors
- 👤 Wayne E Blackburn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:48
CPC Classifications
H; H10; H10D; H10D48/00; H10D48/01; H10D48/04; H10D48/048; H10P; H10P14/00; H10P14/20; H10P14/26; H10P14/263; H10P14/29; H10P14/2901; H10P14/2923; H10P14/32; H10P14/3202; H10P14/3241; H10P14/34; H10P14/3402
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-03-16 | 1951-09-15 | 1952-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-16 | 1955-09-15 | 1956-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-16 | 1959-09-15 | 1960-03-16 | $7700.00 | Window Closed / Lapsed |