US2554237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rectifier
Assignee: Westinghouse Electric Corp
•
Filing: 1945-10-29
•
Granted: 1951-05-22
•
Expires: 1965-10-29
Abstract
No abstract record available.
Inventors
- 👤 Wayne E Blackburn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:33
CPC Classifications
H; H10; H10D; H10D48/00; H10D48/01; H10D48/04; H10D48/043; H10D48/046; H10P; H10P14/00; H10P14/20; H10P14/26; H10P14/263; H10P14/29; H10P14/2901; H10P14/2923; H10P14/34; H10P14/3402
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2137316A
Cited
US2173249A
Cited
US2215999A
Cited
GB522092A
Cited
US2227827A
Cited
US2375355A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-21 | 1954-11-20 | 1955-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-21 | 1958-11-20 | 1959-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-21 | 1962-11-20 | 1963-05-22 | $7700.00 | Window Closed / Lapsed |