Patent US2717733A successfully refreshed from Google Patents.
US2717733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Typewriter controlled calculator
Assignee: International Business Machines Corp
•
Filing: 1951-08-15
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Granted: 1955-09-13
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Expires: 1971-08-15
Abstract
No abstract record available.
Inventors
- 👤 Hans P Luhn
- 👤 Richard L Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:30
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)
US1932220A
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US2364758A
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US2262235A
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US2344885A
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US2403005A
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US2493709A
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US2588923A
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US2551093A
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US2528394A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-09-12 | 1959-03-14 | 1959-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-09-12 | 1963-03-14 | 1963-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-09-12 | 1967-03-14 | 1967-09-13 | $7700.00 | Window Closed / Lapsed |