US3474451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Loop antenna circuit coupling multiple transmitters
Assignee: WILLIAM E ABEL
•
Filing: 1969-01-07
•
Granted: 1969-10-21
•
Expires: 1989-01-07
Abstract
No abstract record available.
Inventors
- 👤 William E Abel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:59
CPC Classifications
G; G09; G09B; G09B5/00; G09B5/08; G09B5/12; H; H04; H04B; H04B5/00; H04B5/20; H04B5/24; H04B5/26; H04B5/266; H04J; H04J1/00; H04J1/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2567431A
Cited
US3118144A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-20 | 1973-04-21 | 1973-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-20 | 1977-04-21 | 1977-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-20 | 1981-04-21 | 1981-10-21 | $7700.00 | Window Closed / Lapsed |