US3147440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cross-modulation detector means tuned to local oscillator frequency
Assignee: Hrb-Singer Inc
•
Filing: 1959-02-17
•
Granted: 1964-09-01
•
Expires: 1979-02-17
Abstract
No abstract record available.
Inventors
- 👤 Rufus R C Benton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:33
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/06; H04B1/10; H04B1/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1678163A
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US1998119A
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US2293628A
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US2606285A
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US2719223A
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US2891147A
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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) | 1967-09-01 | 1968-03-02 | 1968-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-01 | 1972-03-02 | 1972-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-01 | 1976-03-02 | 1976-09-01 | $7700.00 | Window Closed / Lapsed |