US2500200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple channel radio-frequency receiver
Assignee: Decca Record Co Ltd
•
Filing: 1945-08-27
•
Granted: 1950-03-14
•
Expires: 1965-08-27
Abstract
No abstract record available.
Inventors
- 👤 William J O'brien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:56
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02; G01S1/08; G01S1/20; G01S1/30; G01R; G01R25/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE546000C
Cited
US1957519A
Cited
US2151081A
Cited
US2144203A
Cited
US2198113A
Cited
US2318248A
Cited
US2408773A
Cited
US2335265A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-13 | 1953-09-12 | 1954-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-13 | 1957-09-12 | 1958-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-13 | 1961-09-12 | 1962-03-14 | $7700.00 | Window Closed / Lapsed |