US2490660A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio direction finder
Assignee: H G KOENIG
•
Filing: 1946-11-04
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Granted: 1949-12-06
•
Expires: 1966-11-04
Abstract
No abstract record available.
Inventors
- 👤 Joseph G Speer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:22
CPC Classifications
G; G01; G01S; G01S3/00; G01S3/02; G01S3/14; G01S3/38; G01S3/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1915328A
Cited
US2138966A
Cited
US2257757A
Cited
US2276235A
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US2356922A
Cited
US2423337A
Cited
US2368921A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-05 | 1953-06-06 | 1953-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-05 | 1957-06-06 | 1957-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-05 | 1961-06-06 | 1961-12-06 | $7700.00 | Window Closed / Lapsed |