US2631277A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flight hazard warning system
Assignee: Hughes Tool Co
•
Filing: 1947-09-02
•
Granted: 1953-03-10
•
Expires: 1967-09-02
Abstract
No abstract record available.
Inventors
- 👤 Skoller Marvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:00
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/08; G01S13/10; G01S13/18
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1794690A
Cited
US2216575A
Cited
US2266410A
Cited
US2225046A
Cited
US2406316A
Cited
US2433681A
Cited
US2403755A
Cited
US2457393A
Cited
US2455673A
Cited
US2462856A
Cited
US2416088A
Cited
US2403527A
Cited
US2422134A
Cited
US2499349A
Cited
US2495780A
Cited
US2476301A
Cited
US2436672A
Cited
US2468083A
Cited
US2477567A
Cited
US2489202A
Cited
US2490268A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-09 | 1956-09-08 | 1957-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-09 | 1960-09-08 | 1961-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-09 | 1964-09-08 | 1965-03-10 | $7700.00 | Window Closed / Lapsed |