US2666199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio direction maintaining system
Assignee: Unisys Corp
•
Filing: 1950-05-09
•
Granted: 1954-01-12
•
Expires: 1970-05-09
Abstract
No abstract record available.
Inventors
- 👤 Robert F Rothschild
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:56
CPC Classifications
G; G01; G01C; G01C19/00; G01C19/02; G01C19/44; G01C19/46; G01C19/48
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
NL33746C
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US2165800A
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US2362832A
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US2412612A
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US2446024A
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US2437251A
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US2555209A
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US2511614A
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US2484819A
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US2517612A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-11 | 1957-07-13 | 1958-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-11 | 1961-07-13 | 1962-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-11 | 1965-07-13 | 1966-01-12 | $7700.00 | Window Closed / Lapsed |