Patent US2791746A successfully refreshed from Google Patents.
US2791746A
Expired / Lapsed
US
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High speed recorder
Assignee: California Institute Research Foundation
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Filing: 1952-10-24
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Granted: 1957-05-07
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Expires: 1972-10-24
Abstract
No abstract record available.
Inventors
- 👤 Ralph B Bowersox
- 👤 Chester G Hylkema
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:45
CPC Classifications
H; H03; H03M; H03M1/00; G; G01; G01D; G01D15/00; G01D15/06; G01R; G01R17/00; G01R17/02; G01R17/04; H03M1/12; H03M1/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-05-06 | 1960-11-05 | 1961-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-05-06 | 1964-11-05 | 1965-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-05-06 | 1968-11-05 | 1969-05-07 | $7700.00 | Window Closed / Lapsed |