US2533908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio signal detector
Assignee: Research Corp
•
Filing: 1947-11-25
•
Granted: 1950-12-12
•
Expires: 1967-11-25
Abstract
No abstract record available.
Inventors
- 👤 Donald H Andrews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:13
CPC Classifications
H; H03; H03D; H03D1/00; H03D1/08; H01; H01B; H01B1/00; Y; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/828
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2128750A
Cited
US2189122A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-11 | 1954-06-12 | 1954-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-11 | 1958-06-12 | 1958-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-11 | 1962-06-12 | 1962-12-12 | $7700.00 | Window Closed / Lapsed |