Patent US4973666A successfully refreshed from Google Patents.
US2900499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio receiver having modulation indicator operated by automatic gain control bias and demodulated signal
Assignee: Individual
•
Filing: 1957-06-11
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Granted: 1959-08-18
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Expires: 1977-06-11
Abstract
No abstract record available.
Inventors
- 👤 Herman L Blasbalg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:38
CPC Classifications
H; H03; H03J; H03J3/00; H03J3/02; H03J3/12; H03J3/14
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) | 1962-08-17 | 1963-02-16 | 1963-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-17 | 1967-02-16 | 1967-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-17 | 1971-02-16 | 1971-08-18 | $7700.00 | Window Closed / Lapsed |