Patent US2504975A successfully refreshed from Google Patents.
US2504975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio pulse type distance measuring system
Assignee: STC PLC
•
Filing: 1944-03-13
•
Granted: 1950-04-25
•
Expires: 1964-03-13
Abstract
No abstract record available.
Inventors
- 👤 Donald D Grieg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:17
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/74; G01S13/76; G01S13/78; G01S1/00; G01S1/02; G01S1/08; G01S1/20
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1765585A
Cited
GB469417A
Cited
US2165690A
Cited
US2208349A
Cited
US2134716A
Cited
US2250708A
Cited
US2404527A
Cited
US2287174A
Cited
US2391411A
Cited
US2421248A
Cited
US2359447A
Cited
US2419571A
Cited
US2412111A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-04-24 | 1953-10-24 | 1954-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-24 | 1957-10-24 | 1958-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-24 | 1961-10-24 | 1962-04-25 | $7700.00 | Window Closed / Lapsed |