US2547028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direction finding system
Assignee: STC PLC
•
Filing: 1946-02-14
•
Granted: 1951-04-03
•
Expires: 1966-02-14
Abstract
No abstract record available.
Inventors
- 👤 Lester L Libby
- 👤 Cole Eugene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:28
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2266038A
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US2238129A
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US2274546A
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US2408414A
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US2408039A
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US2400641A
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US2422073A
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US2406858A
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US2450014A
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US2443718A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-02 | 1954-10-02 | 1955-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-02 | 1958-10-02 | 1959-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-02 | 1962-10-02 | 1963-04-03 | $7700.00 | Window Closed / Lapsed |