Patent US2577751A successfully refreshed from Google Patents.
US2577751A
Expired / Lapsed
US
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Remote supervisory radio signaling system
Assignee: Farnsworth Research Corp
•
Filing: 1945-03-24
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Granted: 1951-12-11
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Expires: 1965-03-24
Abstract
No abstract record available.
Inventors
- 👤 William S Halstead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:12
CPC Classifications
G; G08; G08G; G08G1/00; G08G1/09; G08G1/0962; G08G1/0967; G08G1/096708; G08G1/096716; B; B61; B61L; B61L15/00; B61L15/009; G08G1/096733; G08G1/096758; G08G1/096766; G08G1/096775
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-10 | 1955-06-11 | 1955-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-10 | 1959-06-11 | 1959-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-10 | 1963-06-11 | 1963-12-11 | $7700.00 | Window Closed / Lapsed |