Patent US2666199A successfully refreshed from Google Patents.
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
2026-10-23 13:41
CPC Classifications
G; G01; G01C; G01C19/00; G01C19/02; G01C19/44; G01C19/46; G01C19/48
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
NL33746C
Cited
US2165800A
Cited
US2362832A
Cited
US2412612A
Cited
US2446024A
Cited
US2437251A
Cited
US2555209A
Cited
US2511614A
Cited
US2484819A
Cited
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 |