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US2677058A
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Method and apparatus for controlling the frequency of high-frequency generating apparatus
Assignee: Cook Electric Co
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Filing: 1949-09-27
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Granted: 1954-04-27
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Expires: 1969-09-27
Abstract
No abstract record available.
Inventors
- 👤 Robert A Kirkman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:27
CPC Classifications
H; H03; H03J; H03J7/00; H03J7/02; H03J7/16; H03L; H03L7/00; H03L7/02; H03L7/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2476311A
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US2502456A
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US2452575A
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US2475074A
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US2474580A
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US2593463A
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US2562958A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-26 | 1957-10-26 | 1958-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-26 | 1961-10-26 | 1962-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-26 | 1965-10-26 | 1966-04-27 | $7700.00 | Window Closed / Lapsed |