Patent US2491031A successfully refreshed from Google Patents.
US2491031A
Expired / Lapsed
US
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Rectifier
Assignee: DAVID A MARCUS
•
Filing: 1947-02-17
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Granted: 1949-12-13
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Expires: 1967-02-17
Abstract
No abstract record available.
Inventors
- 👤 William H Burgess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:26
CPC Classifications
H; H01; H01R; H01R13/00; H01R13/66; H01R13/6608; H01R13/6641; H10; H10W; H10W90/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1251377A
Cited
US1751360A
Cited
GB304579A
Cited
US1892567A
Cited
US2243573A
Cited
US2327511A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-12 | 1953-06-13 | 1953-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-12 | 1957-06-13 | 1957-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-12 | 1961-06-13 | 1961-12-13 | $7700.00 | Window Closed / Lapsed |