US2425330A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode-ray system with bright and dark marker indications
Assignee: Sperry Gyroscope Co Inc
•
Filing: 1943-06-22
•
Granted: 1947-08-12
•
Expires: 1963-06-22
Abstract
No abstract record available.
Inventors
- 👤 David E Kenyon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:07
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/04; G01S7/06; G01S7/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2227197A
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US2137262A
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US2285043A
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US2227492A
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US2121359A
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US2255485A
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US2255484A
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US2313967A
Cited
US2275460A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-08-11 | 1951-02-10 | 1951-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-08-11 | 1955-02-10 | 1955-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-08-11 | 1959-02-10 | 1959-08-12 | $7700.00 | Window Closed / Lapsed |