US2931015A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drive system for magnetic core memories
Assignee: Unisys Corp
•
Filing: 1955-06-16
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Granted: 1960-03-29
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Expires: 1975-06-16
Abstract
No abstract record available.
Inventors
- 👤 Theodore H Bonn
- 👤 Jr Joseph D Lawrence
- 👤 William J Bartik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:21
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/80; H03K17/81; G; G11; G11C; G11C11/00; G11C11/02; G11C11/06; G11C11/06007; H03K17/56; H03K17/60; H03K17/62; H03K17/6221
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2591406A
Cited
US2734187A
Cited
US2764726A
Cited
US2717965A
Cited
US2691156A
Cited
US2822532A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-29 | 1963-09-28 | 1964-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-29 | 1967-09-28 | 1968-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-29 | 1971-09-28 | 1972-03-29 | $7700.00 | Window Closed / Lapsed |