Patent US3475685A successfully refreshed from Google Patents.
US3475685A
Expired / Lapsed
US
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Interrogating apparatus for determining optimum frequency for radio communication
Assignee: EMI Cossor Electronics Ltd
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Filing: 1965-06-14
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Granted: 1969-10-28
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Expires: 1985-06-14
Abstract
No abstract record available.
Inventors
- 👤 Dennis H Covill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:56
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/02; H04B7/10; H04B17/00; H04B17/20; H04B17/23; H04B17/30; H04B17/309; H04B17/346
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) | 1972-10-27 | 1973-04-28 | 1973-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-27 | 1977-04-28 | 1977-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-27 | 1981-04-28 | 1981-10-28 | $7700.00 | Window Closed / Lapsed |