US2939135A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aircraft proximity warning system with incorporated testing system
Assignee: Collins Radio Co
•
Filing: 1956-10-08
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Granted: 1960-05-31
•
Expires: 1976-10-08
Abstract
No abstract record available.
Inventors
- 👤 John F Beckerich
- 👤 Kenneth W Hannah
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:15
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/40; G01S7/4004; G01S7/4021; G01S13/00; G01S13/88; G01S13/93; G01S13/933
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2157122A
Cited
US2433681A
Cited
US2280109A
Cited
US2471888A
Cited
US2486197A
Cited
US2631278A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-31 | 1963-11-30 | 1964-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-31 | 1967-11-30 | 1968-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-31 | 1971-11-30 | 1972-05-31 | $7700.00 | Window Closed / Lapsed |