Patent US2977578A successfully refreshed from Google Patents.
US2977578A
Expired / Lapsed
US
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Controlled circuits for interim storage systems
Assignee: Individual
•
Filing: 1957-11-29
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Granted: 1961-03-28
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Expires: 1977-11-29
Abstract
No abstract record available.
Inventors
- 👤 Howard L Daniels
- 👤 Curtis W Fritze
- 👤 Rolland R Ritter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:37
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2625607A
Cited
US2760063A
Cited
US2817829A
Cited
US2793344A
Cited
US2817072A
Cited
US2827623A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-27 | 1964-09-26 | 1965-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-27 | 1968-09-26 | 1969-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-27 | 1972-09-26 | 1973-03-28 | $7700.00 | Window Closed / Lapsed |