Patent US3250262A successfully refreshed from Google Patents.
US3250262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for controlling the air-fuel ratio of a four-stroke cycle engine
Assignee: Georgia Tech Research Institute
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Filing: 1963-05-31
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Granted: 1966-05-10
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Expires: 1983-05-31
Abstract
No abstract record available.
Inventors
- 👤 Robert L Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:28
CPC Classifications
F; F02; F02M; F02M69/00; F02M69/46; F02M69/467; F02D; F02D3/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
IN A METHOD OF CONTROLLING THE AIR-FUEL RATIO OF A COMBUSTIBLE MIXTURE OF AIR AND FUEL USED BY AN INTERNAL COMBUSTION ENGINE HAVING AN INTAKE MANIFOLD PRESSURE WHICH CHANGES AND A THROTTLE WHICH CHANGES ANGULAR POSITION DURING THE OPERATION OF SAID ENGINE, THE AIR AVAILABLE FOR SAID COMBUSTIBLE MIXTURE CHANGING IN QUANTITY DURING THE OPERATION OF SAID ENGINE AND THE SAID METHOD COMPRISING THE STEP OF VARYING THE QUANTITY OF FUEL USED TO OBTAIN A COMBUSTIBLE MIXTURE WITH THE ACTUAL QUANTITY OF AIR AVAILABLE IN RESPONSE TO A MECHANICALLY ESTABLISHED RELATIONSHIP BETWEEN INTAKE MANIFOLD PRESSURE AND THE ANGULAR POSITION OF SAID THROTTLE WHICH IS REPRESENTATIVE OF THE SAID ACTUAL QUANTITY OF AIR AVAILABLE WHEREBY THE RESULTING EFFECT ON THE FUEL ADDED FOR A GIVEN CHANGE IN THROTTLE VARIES WITH CHANGES IN MANIFOLD PRESSURE.
Claim 2
Dependent Claim
133 words
IN A METHOD OF CONTROLLING THE AIR-FUEL RATIO OF A COMBUSTIBLE MIXTURE OF AIR AND FUEL USED BY AN INTERNAL COMBUSTION ENGINE HAVING AN INTAKE MANIFOLD PRESSURE WHICH CHANGES AND A THROTTLE WHICH CHANGES ANGULAR POSITION DURING THE OPERATION OF SAID ENGINE, THE AIR AVAILABLE FOR SAID COMBUSTIBLE MIXTURE CHANGING IN QUANTITY DURING THE OPERATION OF SAID ENGINE AND THE SAID METHOD COMPRISING THE STEP OF VARYING THE QUANTITY OF FUEL USED TO OBTAIN A COMBUSTIBLE MIXTURE WITH THE ACTUAL QUANTITY OF AIR AVAILABLE IN RESPONSE TO A MECHANICALLY ESTABLISHED RELATIONSHIP BETWEEN INTAKE MANIFOLD PRESSURE AND THE ANGULAR POSITION OF SAID THROTTLE WHICH IS REPRESENTATIVE OF THE SAID ACTUAL QUANTITY OF AIR AVAILABLE WHEREBY THE RESULTING EFFECT ON THE FUEL ADDED FOR A GIVEN CHANGE IN THROTTLE VARIES WITH CHANGES IN MANIFOLD PRESSURE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-09 | 1969-11-08 | 1970-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-09 | 1973-11-08 | 1974-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-09 | 1977-11-08 | 1978-05-10 | $7700.00 | Window Closed / Lapsed |