Patent US2690558A successfully refreshed from Google Patents.
US2690558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio navigation system
Assignee: GTE Sylvania Inc
•
Filing: 1950-02-04
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Granted: 1954-09-28
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Expires: 1970-02-04
Abstract
No abstract record available.
Inventors
- 👤 Norman L Harvey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:07
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1562485A
Cited
US1495616A
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US1995285A
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US1976877A
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US2041855A
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US2198113A
Cited
US2413694A
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US2449174A
Cited
USRE23050E
Cited
US2497513A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-27 | 1958-03-29 | 1958-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-27 | 1962-03-29 | 1962-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-27 | 1966-03-29 | 1966-09-28 | $7700.00 | Window Closed / Lapsed |