US2563998A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direction finding apparatus
Assignee: Individual
•
Filing: 1946-03-01
•
Granted: 1951-08-14
•
Expires: 1966-03-01
Abstract
No abstract record available.
Inventors
- 👤 Donald D Foster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 07:10
CPC Classifications
G; G01; G01S; G01S3/00; G01S3/02; G01S3/14; G01S3/58; G01S13/00; G01S13/02; G01S13/06; G01S13/42; G01S13/422
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2169742A
Cited
US2160093A
Cited
US2215785A
Cited
US2231929A
Cited
US2302902A
Cited
US2326662A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-08-13 | 1955-02-12 | 1955-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-13 | 1959-02-12 | 1959-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-13 | 1963-02-12 | 1963-08-14 | $7700.00 | Window Closed / Lapsed |