Patent US2480829A successfully refreshed from Google Patents.
US2480829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio direction indicating apparatus
Assignee: Research Corp
•
Filing: 1942-01-29
•
Granted: 1949-09-06
•
Expires: 1962-01-29
Abstract
No abstract record available.
Inventors
- 👤 Wilmer L Barrow
- 👤 Daniel S Pensyl
- 👤 Walter W Mieher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:26
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/66; G01S13/68; G01S1/00; G01S1/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1844859A
Cited
US1862119A
Cited
US1961598A
Cited
DE550515C
Cited
US2063534A
Cited
US2206923A
Cited
US2235826A
Cited
US2176469A
Cited
US2238129A
Cited
US2206683A
Cited
US2257319A
Cited
US2254943A
Cited
US2156297A
Cited
US2231929A
Cited
US2257757A
Cited
GB526658A
Cited
US2208378A
Cited
US2277464A
Cited
US2412702A
Cited
US2424193A
Cited
US2410657A
Cited
US2396044A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-09-05 | 1953-03-07 | 1953-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-09-05 | 1957-03-07 | 1957-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-09-05 | 1961-03-07 | 1961-09-06 | $7700.00 | Window Closed / Lapsed |