Patent US2426089A successfully refreshed from Google Patents.
US2426089A
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US
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Operation indicator for airplane engines
Assignee: Individual
•
Filing: 1944-11-14
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Granted: 1947-08-19
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Expires: 1964-11-14
Abstract
No abstract record available.
Inventors
- 👤 Jr Walter H Fitzgerald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:50
CPC Classifications
F; F01; F01D; F01D21/00; F02; F02C; F02C7/00; F02C7/20; B; B60; B60G; B60G2204/00; B60G2204/10; B60G2204/11; B60G2204/40; B60G2204/41; B60G2400/00; B60G2400/60; B60G2400/61; B60G2400/80; B60G2400/82; B60G2400/821
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US996170A
Cited
US1057261A
Cited
US2095142A
Cited
AT145371B
Cited
GB500247A
Cited
US2248653A
Cited
US2167533A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-08-18 | 1951-02-17 | 1951-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-08-18 | 1955-02-17 | 1955-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-08-18 | 1959-02-17 | 1959-08-19 | $7700.00 | Window Closed / Lapsed |