US2821704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Navigation system
Assignee: Individual
•
Filing: 1945-11-30
•
Granted: 1958-01-28
•
Expires: 1965-11-30
Abstract
No abstract record available.
Inventors
- 👤 Marcus D O'day
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:33
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/88; G01S13/91; G01S13/913; G01S1/00; G01S1/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2169374A
Cited
US2288196A
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US2405238A
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US2406953A
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US2420408A
Cited
US2403626A
Cited
US2408048A
Cited
US2515332A
Cited
US2433381A
Cited
US2480123A
Cited
US2470787A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-27 | 1961-07-29 | 1962-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-27 | 1965-07-29 | 1966-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-27 | 1969-07-29 | 1970-01-28 | $7700.00 | Window Closed / Lapsed |