Patent DE320872C successfully refreshed from Google Patents.
US2440777A
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US
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Tridimensional radio direction indicator
Assignee: Unisys Corp
•
Filing: 1946-01-31
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Granted: 1948-05-04
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Expires: 1966-01-31
Abstract
No abstract record available.
Inventors
- 👤 Lyman Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:27
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB190413170A
Cited
US1844859A
Cited
FR812975A
Cited
US2174350A
Cited
US2151549A
Cited
US2199819A
Cited
US2254943A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-05-04 | 1951-11-03 | 1952-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-05-04 | 1955-11-03 | 1956-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-05-04 | 1959-11-03 | 1960-05-04 | $7700.00 | Window Closed / Lapsed |