US2812637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel air ratio regulation for combustion systems
Assignee: Phillips Petroleum Co
•
Filing: 1951-12-21
•
Granted: 1957-11-12
•
Expires: 1971-12-21
Abstract
No abstract record available.
Inventors
- 👤 Homer M Fox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:16
CPC Classifications
F; F23; F23R; F23R3/00; F23R3/02; F23R3/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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GB484289A
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US2193114A
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US2253809A
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CH212269A
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US2470184A
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US2404395A
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GB616622A
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US2651175A
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GB618644A
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US2655787A
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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) | 1960-11-11 | 1961-05-13 | 1961-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-11 | 1965-05-13 | 1965-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-11 | 1969-05-13 | 1969-11-12 | $7700.00 | Window Closed / Lapsed |