US2490061A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio-wire communication system
Assignee: United Airlines Inc
•
Filing: 1947-07-31
•
Granted: 1949-12-06
•
Expires: 1967-07-31
Abstract
No abstract record available.
Inventors
- 👤 Evan A Jensen
- 👤 Kenneth J Rhead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:40
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/14; H04B7/15; H04B7/185; H04B7/18502; H04B7/24; H04B7/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2064907A
Cited
US2429607A
Cited
US2289485A
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US2421017A
Cited
US2393291A
Cited
US2398741A
Cited
US2407417A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-05 | 1953-06-06 | 1953-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-05 | 1957-06-06 | 1957-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-05 | 1961-06-06 | 1961-12-06 | $7700.00 | Window Closed / Lapsed |