US2973901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital computing engines
Assignee: International Business Machines Corp
•
Filing: 1954-03-11
•
Granted: 1961-03-07
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Expires: 1974-03-11
Abstract
No abstract record available.
Inventors
- 👤 Petherick Edward John
- 👤 Rowley Geoffrey Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:38
CPC Classifications
G; G06; G06F; G06F7/00; G06F7/38; G06F7/48; G06F7/491; G06F7/498; G06F7/4983; G06F7/4985; H; H03; H03K; H03K21/00; H03K23/00; H03K23/82
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2534287A
Cited
US2679977A
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US2502360A
Cited
GB709407A
Cited
US2538636A
Cited
US2658681A
Cited
US2604262A
Cited
US2837281A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-06 | 1964-09-05 | 1965-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-06 | 1968-09-05 | 1969-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-06 | 1972-09-05 | 1973-03-07 | $7700.00 | Window Closed / Lapsed |