US2431659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel economizer
Assignee: WILLIAM STEELL JACKSON AND SON
•
Filing: 1942-02-04
•
Granted: 1947-11-25
•
Expires: 1962-02-04
Abstract
No abstract record available.
Inventors
- 👤 Frank R Flounders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:29
CPC Classifications
F; F02; F02M; F02M19/00; F02M19/12; F02M19/122
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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GB420609A
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US2090246A
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US2104649A
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US2197925A
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US2179788A
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US2193738A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-11-24 | 1951-05-26 | 1951-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-11-24 | 1955-05-26 | 1955-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-11-24 | 1959-05-26 | 1959-11-25 | $7700.00 | Window Closed / Lapsed |