US3445831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drive system for a magnetic core array
Assignee: International Business Machines Corp
•
Filing: 1965-10-05
•
Granted: 1969-05-20
•
Expires: 1985-10-05
Abstract
No abstract record available.
Inventors
- 👤 Thomas S Cooper
- 👤 David E Norton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:40
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/60; H03K17/64; G; G11; G11C; G11C11/00; G11C11/02; G11C11/06; G11C11/06007
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3289008A
Cited
US3343147A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-19 | 1972-11-18 | 1973-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-19 | 1976-11-18 | 1977-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-19 | 1980-11-18 | 1981-05-20 | $7700.00 | Window Closed / Lapsed |