Patent US2864393A successfully refreshed from Google Patents.
US2864393A
Expired / Lapsed
US
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Pressure ratio senser
Assignee: MARQUARDT AIRCRAFT Co
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Filing: 1953-08-31
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Granted: 1958-12-16
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Expires: 1973-08-31
Abstract
No abstract record available.
Inventors
- 👤 John A Drake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:37
CPC Classifications
G; G01; G01L; G01L15/00; G01L11/00; G01L11/004; G01L11/006; Y; Y10; Y10T; Y10T137/00; Y10T137/2278
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2223712A
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US2512790A
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US2592176A
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US2629569A
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US2671620A
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US2592569A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-15 | 1962-06-16 | 1962-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-15 | 1966-06-16 | 1966-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-15 | 1970-06-16 | 1970-12-16 | $7700.00 | Window Closed / Lapsed |