Patent US2786140A successfully refreshed from Google Patents.
US2786140A
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Apparatus for frequency interpolation
Assignee: General Radio Co
•
Filing: 1952-08-22
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Granted: 1957-03-19
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Expires: 1972-08-22
Abstract
No abstract record available.
Inventors
- 👤 Frank D Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:25
CPC Classifications
H; H03; H03L; H03L7/00; H03L7/06; H03L7/16; G; G01; G01R; G01R23/00
Claims Analysis
Total Claims: 0
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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) | 1960-03-18 | 1960-09-17 | 1961-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-18 | 1964-09-17 | 1965-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-18 | 1968-09-17 | 1969-03-19 | $7700.00 | Window Closed / Lapsed |