US2990538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: International Business Machines Corp
•
Filing: 1954-11-26
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Granted: 1961-06-27
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Expires: 1974-11-26
Abstract
No abstract record available.
Inventors
- 👤 James A Weidenhammer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:28
CPC Classifications
G; G11; G11C; G11C11/00; G11C11/21; G11C11/23
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2609050A
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US2652554A
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US2688656A
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US2653996A
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US2689950A
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US2718356A
Cited
US2721990A
Cited
US2702380A
Cited
US2708267A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-26 | 1964-12-26 | 1965-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-26 | 1968-12-26 | 1969-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-26 | 1972-12-26 | 1973-06-27 | $7700.00 | Window Closed / Lapsed |