US2658681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic calculator
Assignee: International Business Machines Corp
•
Filing: 1948-07-09
•
Granted: 1953-11-10
•
Expires: 1968-07-09
Abstract
No abstract record available.
Inventors
- 👤 Ralph L Palmer
- 👤 James E Fernekees
- 👤 Jerrier A Haddad
- 👤 Byron E Phelps
- 👤 Jr James V Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:54
CPC Classifications
G; G06; G06F; G06F7/00; G06F7/38; G06F7/48; G06F7/491; G06F7/498; G06F7/4983; G06F7/4985
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2328610A
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US2402988A
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US2404697A
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US2442428A
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US2516189A
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US2528100A
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US2587979A
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US2502360A
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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) | 1956-11-09 | 1957-05-11 | 1957-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-09 | 1961-05-11 | 1961-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-09 | 1965-05-11 | 1965-11-10 | $7700.00 | Window Closed / Lapsed |