Patent US2990182A successfully refreshed from Google Patents.
US2990182A
Expired / Lapsed
US
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Recording and reproducing apparatus for a helicoid recording surface
Assignee: Individual
•
Filing: 1957-06-25
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Granted: 1961-06-27
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Expires: 1977-06-25
Abstract
No abstract record available.
Inventors
- 👤 Cailliot Serge Leon Louis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:10
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/20; G11B23/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US794592A
Cited
AT37160B
Cited
US1121239A
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US2265879A
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US2262732A
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US2396563A
Cited
US2498746A
Cited
US2430283A
Cited
US2499421A
Cited
US2513423A
Cited
GB699700A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-26 | 1964-12-26 | 1965-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-26 | 1968-12-26 | 1969-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-26 | 1972-12-26 | 1973-06-27 | $7700.00 | Window Closed / Lapsed |