Patent US3531775A successfully refreshed from Google Patents.
US3531775A
Expired / Lapsed
US
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Memory apparatus for rapid write-in and read-out of information
Assignee: Fujitsu Ltd
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Filing: 1967-09-27
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Granted: 1970-09-29
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Expires: 1987-09-27
Abstract
No abstract record available.
Inventors
- 👤 Yasuo Ishii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:53
CPC Classifications
G; G11; G11C; G11C11/00; G11C11/02; G11C11/06; G11C11/06007; G11C11/06014; G11C11/06021; G11C11/06028; G11C11/06035; G06; G06F; G06F12/00; G06F12/02; G06F12/0207; G11C19/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3106698A
Cited
US3090041A
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US3305841A
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US3402398A
Cited
US3416146A
Cited
US3387272A
Cited
US3366931A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-28 | 1974-03-30 | 1974-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-28 | 1978-03-30 | 1978-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-28 | 1982-03-30 | 1982-09-29 | $7700.00 | Window Closed / Lapsed |