US2651457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Calculating machine
Assignee: International Business Machines Corp
•
Filing: 1949-05-13
•
Granted: 1953-09-08
•
Expires: 1969-05-13
Abstract
No abstract record available.
Inventors
- 👤 Hans P Luhn
- 👤 Richard L Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:14
CPC Classifications
G; G06; G06F; G06F7/00; G06F7/38; G06F7/46; G06F7/468
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2364758A
Cited
US1902035A
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US2178064A
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US2202235A
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US2403005A
Cited
US2302001A
Cited
US2419502A
Cited
GB600896A
Cited
US2486809A
Cited
US2536951A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-09-07 | 1957-03-09 | 1957-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-07 | 1961-03-09 | 1961-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-07 | 1965-03-09 | 1965-09-08 | $7700.00 | Window Closed / Lapsed |