US2604529A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selsyn apparatus for navigational systems
Assignee: Individual
•
Filing: 1949-04-11
•
Granted: 1952-07-22
•
Expires: 1969-04-11
Abstract
No abstract record available.
Inventors
- 👤 Llewellyn G Duggar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:23
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1972889A
Cited
US2027528A
Cited
US2127415A
Cited
US2361956A
Cited
US2299083A
Cited
US2433860A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-07-22 | 1956-01-21 | 1956-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-22 | 1960-01-21 | 1960-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-22 | 1964-01-21 | 1964-07-22 | $7700.00 | Window Closed / Lapsed |