US2998191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Asynchronous add-subtract system
Assignee: International Business Machines Corp
•
Filing: 1959-05-11
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Granted: 1961-08-29
•
Expires: 1979-05-11
Abstract
No abstract record available.
Inventors
- 👤 Melvin R Marshall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:59
CPC Classifications
G; G06; G06F; G06F7/00; G06F7/38; G06F7/48; G06F7/50; G06F7/505; G06F7/5052; G06F11/00; G06F11/07; G06F11/16; G06F11/1608
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2861744A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-28 | 1965-02-27 | 1965-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-28 | 1969-02-27 | 1969-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-28 | 1973-02-27 | 1973-08-29 | $7700.00 | Window Closed / Lapsed |