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US3421153A
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Thin film magnetic memory with parametron driver circuits
Assignee: Unisys Corp
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Filing: 1964-07-28
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Granted: 1969-01-07
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Expires: 1984-07-28
Abstract
No abstract record available.
Inventors
- 👤 William J Bartik
- 👤 Woo Foung Chow
- 👤 Edward N Schwartz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:53
CPC Classifications
G; G11; G11C; G11C11/00; G11C11/19; G11C11/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3175200A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-07 | 1972-07-08 | 1973-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-07 | 1976-07-08 | 1977-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-07 | 1980-07-08 | 1981-01-07 | $7700.00 | Window Closed / Lapsed |