US2981833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound powered radio transmitter
Assignee: Individual
•
Filing: 1955-03-17
•
Granted: 1961-04-25
•
Expires: 1975-03-17
Abstract
No abstract record available.
Inventors
- 👤 Jr George W Bryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:21
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/02; H04B1/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1448583A
Cited
US1441029A
Cited
US2409058A
Cited
US2482148A
Cited
US2486776A
Cited
US2676273A
Cited
US2777057A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |