US2978681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic core memory device
Assignee: Unisys Corp
•
Filing: 1955-06-13
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Granted: 1961-04-04
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Expires: 1975-06-13
Abstract
No abstract record available.
Inventors
- 👤 Jr John C Sims
- 👤 William J Bartik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:10
CPC Classifications
G; G11; G11C; G11C5/00; G11C5/02; G11C5/04; G11C5/05; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49069
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1988734A
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US2654142A
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US2783416A
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US2784391A
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US2825891A
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US2700150A
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US2724103A
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US2712126A
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US2823371A
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US2823360A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-03 | 1964-10-03 | 1965-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-03 | 1968-10-03 | 1969-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-03 | 1972-10-03 | 1973-04-04 | $7700.00 | Window Closed / Lapsed |