Patent US2636679A successfully refreshed from Google Patents.
US2636679A
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US
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Keyboard clearing mechanism
Assignee: Monroe Calculating Machine Co
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Filing: 1950-09-13
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Granted: 1953-04-28
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Expires: 1970-09-13
Abstract
No abstract record available.
Inventors
- 👤 Gang Herman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:17
CPC Classifications
G; G06; G06C; G06C7/00; G06C7/02; G06C7/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1354839A
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US2160361A
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US2350979A
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US2366345A
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US2390041A
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US2403273A
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US2531204A
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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) | 1956-04-27 | 1956-10-27 | 1957-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-27 | 1960-10-27 | 1961-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-27 | 1964-10-27 | 1965-04-28 | $7700.00 | Window Closed / Lapsed |