Patent US4447272A successfully refreshed from Google Patents.
Patent US3575388A successfully refreshed from Google Patents.
US3575388A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealed carburetor
Assignee: Gulf Research and Development Co
•
Filing: 1968-08-16
•
Granted: 1971-04-20
•
Expires: 1988-08-16
Abstract
Abstract The invention comprises a carburetor having a controller in the fuel line feeding the main carburetor venturi to seal the fuel system against evaporative losses. The controller comprises two diaphragm operated valves arranged in cascade series. A throttleactuated pump is also provided to operate the diaphragms to open the valves simultaneously and quickly for fast acceleration.
Inventors
- 👤 John Scarr Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:16
CPC Classifications
F; F02; F02M; F02M7/00; F02M7/06; F02M7/08; F02M17/00; F02M17/02; F02M17/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
209 words
In combination, a carburetor comprising a main air passageway having a venturi portion, means to supply fuel under pressure to said venturi portion, controller means interposed in said fuel supply means, said controller means comprising a pair of fuel chambers each defined by flexible diaphragm means, a pair of operating chambers each associated with one of said fuel chambers and each defined by one of said flexible diaphragm means, passageway means interconnecting said first and second fuel chambers, first valve means operable by a first of said flexible diaphragm means interconnecting said fuel supply means with said first fuel chamber, second valve means operable by said second flexible diaphragm means to control the flow of fuel from said first fuel chamber to said second fuel chamber via said passageway means, whereby changes in air flow through said venturi portion will affect cascade operation of said first and second flexible diaphragm means to flow fuel from said fuel supply means via said first and second fuel chambers into said venturi portion, and pump means for selectively and simultaneously supplying pressurized fluid to both of said first and second operating chambers to simultaneously operate said first and second flexible diaphragm means to thereby simultaneously open said first and second valve means.
Claim 2
Dependent Claim
209 words
In combination, a carburetor comprising a main air passageway having a venturi portion, means to supply fuel under pressure to said venturi portion, controller means interposed in said fuel supply means, said controller means comprising a pair of fuel chambers each defined by flexible diaphragm means, a pair of operating chambers each associated with one of said fuel chambers and each defined by one of said flexible diaphragm means, passageway means interconnecting said first and second fuel chambers, first valve means operable by a first of said flexible diaphragm means interconnecting said fuel supply means with said first fuel chamber, second valve means operable by said second flexible diaphragm means to control the flow of fuel from said first fuel chamber to said second fuel chamber via said passageway means, whereby changes in air flow through said venturi portion will affect cascade operation of said first and second flexible diaphragm means to flow fuel from said fuel supply means via said first and second fuel chambers into said venturi portion, and pump means for selectively and simultaneously supplying pressurized fluid to both of said first and second operating chambers to simultaneously operate said first and second flexible diaphragm means to thereby simultaneously open said first and second valve means.
Claim 3
Dependent Claim
74 words
The combination of claim 1, said carburetor comprising a throttle plate mounted on an operating pin and positioned in said carburetor main air passageway, means interconnecting said throttle plate operating pin and operating means of said pump means, whereby operation of said throttle plate to rapidly increase the rate of air flow through said carburetor main air passageway will cause simultaneous actuation of said pump means to supply pressurized fluid to said operating chambers.
Claim 4
Dependent Claim
55 words
The combinatIon of claim 1, said pressurized fluid from said pump means comprising air, and said pump means further comprising means to supply air at substantially atmospheric pressure to said operating chambers at times other than when said pump means are operated to override the normal cascade operation of said first and second valve means.
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) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |