Patent DE2443544A1 successfully refreshed from Google Patents.
US3541520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Time-sharing arrangement
Assignee: International Business Machines Corp
•
Filing: 1967-12-18
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Granted: 1970-11-17
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Expires: 1987-12-18
Abstract
No abstract record available.
Inventors
- 👤 Alvin P Mullery
- 👤 Graham C Driscoll Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:55
CPC Classifications
G; G06; G06F; G06F9/00; G06F9/06; G06F9/46; G06F9/48; G06F9/4806; G06F9/4843; G06F9/4881; G06F15/00; G06F15/16; G06F15/161
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-16 | 1974-05-18 | 1974-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-16 | 1978-05-18 | 1978-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-16 | 1982-05-18 | 1982-11-17 | $7700.00 | Window Closed / Lapsed |