Patent US2991374A successfully refreshed from Google Patents.
US2991374A
Expired / Lapsed
US
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Electrical memory system utilizing free charge storage
Assignee: US Philips Corp
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Filing: 1956-12-03
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Granted: 1961-07-04
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Expires: 1976-12-03
Abstract
No abstract record available.
Inventors
- 👤 Miranda Heine Andries Rodri De
- 👤 Tulp Theodorus Joannes
- 👤 Zwijse Wilhelmus Antoniu Marie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:49
CPC Classifications
G; G11; G11C; G11C19/00; G11C19/02; G11C19/04; G11C19/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-03 | 1965-01-02 | 1965-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-03 | 1969-01-02 | 1969-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-03 | 1973-01-02 | 1973-07-04 | $7700.00 | Window Closed / Lapsed |