US2685643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual-diversity receiving system
Assignee: Individual
•
Filing: 1948-12-08
•
Granted: 1954-08-03
•
Expires: 1968-12-08
Abstract
No abstract record available.
Inventors
- 👤 Fisk Bert
- 👤 Charles L Spencer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:23
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/02; H04B7/04; H04B7/08; H04B7/0802; H04B7/0817; H04B7/082
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2494309A
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US2545214A
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US2515668A
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US2515055A
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US2495826A
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US2555557A
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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) | 1957-08-02 | 1958-02-01 | 1958-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-02 | 1962-02-01 | 1962-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-02 | 1966-02-01 | 1966-08-03 | $7700.00 | Window Closed / Lapsed |