US3541529A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Replacement system
Assignee: International Business Machines Corp
•
Filing: 1969-09-22
•
Granted: 1970-11-17
•
Expires: 1989-09-22
Abstract
No abstract record available.
Inventors
- 👤 Robert A Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:03
CPC Classifications
G; G11; G11C; G11C15/00; G11C15/04; G06; G06F; G06F12/00; G06F12/02; G06F12/08; G06F12/12; G06F12/121; G06F12/123; G06F12/125
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2843841A
Cited
US3248702A
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US3284776A
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US3248708A
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US3231868A
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US3251041A
Cited
US3292152A
Cited
US3275991A
Cited
US3351909A
Cited
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 |