US2740924A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dry plate type rectifier
Assignee: Keefe & Merritt Co O
•
Filing: 1951-07-05
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Granted: 1956-04-03
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Expires: 1971-07-05
Abstract
No abstract record available.
Inventors
- 👤 Maurice W Brainard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:21
CPC Classifications
H; H10; H10W; H10W90/00; H10D; H10D99/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2215667A
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US2395059A
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US2353461A
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US2486110A
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US2550710A
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US2471011A
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US2525495A
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US2634379A
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US2665398A
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US2665334A
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US2629853A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-03 | 1959-10-03 | 1960-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-03 | 1963-10-03 | 1964-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-03 | 1967-10-03 | 1968-04-03 | $7700.00 | Window Closed / Lapsed |