US2426218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Instrument navigation system
Assignee: International Standard Electric Corp
•
Filing: 1942-03-23
•
Granted: 1947-08-26
•
Expires: 1962-03-23
Abstract
No abstract record available.
Inventors
- 👤 Jr Roy C Hopgood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:59
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/88; G01S13/91; G01S13/913; G01S1/00; G01S1/02; G01S13/02; G01S13/06; G01S13/42; G01S13/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE557257C
Cited
US2151549A
Cited
US2212110A
Cited
US2226860A
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US2134716A
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US2231929A
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US2280126A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-08-25 | 1951-02-24 | 1951-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-08-25 | 1955-02-24 | 1955-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-08-25 | 1959-02-24 | 1959-08-26 | $7700.00 | Window Closed / Lapsed |