Patent US3747581A successfully refreshed from Google Patents.
US3747581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and means for reducing pollutants in exhaust from internal combustion engines
Assignee: Individual
•
Filing: 1971-02-17
•
Granted: 1973-07-24
•
Expires: 1991-02-17
Abstract
Abstract A portion of the contaminants in ICE exhausts has its origin in intake of fuel in droplet rather than vapor form. This invention provides two cooperating means of assuring evaporation of the fuel before intake. A venturi throat is provided in a passage after mixing of fuel with intake air in a conventional carburetor having a venturi throat. This second venturi throat provides a pressure reduction in the intake mixture following carburation which causes much of the fuel still in droplet form to evaporate. A low resistance catching filter or screen is placed in the path of the intake mixture after the second venturi throat such as to collect droplets there existing such as those which were too large to be evaporated by the pressure reduction at the pressure reduction throat. These droplets are collected and evaporated in a region of elevated temperature in close proximity to the cylinders while being reduced in volume to be evaporated by the second venturi evaporator.
Inventors
- 👤 R Kolb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:59
CPC Classifications
F; F02; F02M; F02M29/00; F02M29/04; F02M19/00; F02M19/08; F02M19/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
152 words
In an internal combustion engine having a carburetor including a fuel aspirating nozzle in a venturi and a throttle valve controlling mixture passage to a manifold connecting the carburetor to an input port of a cylinder, the improvement for evaporating input fuel comprising in combination, means for reducing the pressure after carburation of the air-fuel mixture without further fluid aspiration to enhance the evaporation of aspirated fuel portions in droplet form, including a Bernouilli constriction downstream from the carburetor, said constriction having an opening not substantially smaller than the opening in the carburetor venturi, and a droplet retaining filter device arranged across the manifold downstream from the minimum area of said constriction, said screen comprising a bag-like portion extending through said constriction and downstream therefrom a distance at least equal to the minimum diameter of the restruction and including a mounting flange radially extending from the upstream opening of said bag portion.
Claim 2
Dependent Claim
152 words
In an internal combustion engine having a carburetor including a fuel aspirating nozzle in a venturi and a throttle valve controlling mixture passage to a manifold connecting the carburetor to an input port of a cylinder, the improvement for evaporating input fuel comprising in combination, means for reducing the pressure after carburation of the air-fuel mixture without further fluid aspiration to enhance the evaporation of aspirated fuel portions in droplet form, including a Bernouilli constriction downstream from the carburetor, said constriction having an opening not substantially smaller than the opening in the carburetor venturi, and a droplet retaining filter device arranged across the manifold downstream from the minimum area of said constriction, said screen comprising a bag-like portion extending through said constriction and downstream therefrom a distance at least equal to the minimum diameter of the restruction and including a mounting flange radially extending from the upstream opening of said bag portion.
Claim 3
Dependent Claim
171 words
In an internal combustion engine having a carburetor including a fuel aspirating nozzle in a venturi and a throttle valve controlling mixture passage to a manifold connecting the carburetor to an input port of a cylinder, the improvement for evaporating input fuel comprising in combination, means for reducing the pressure after carburation of the air-fuel mixture without further fluid aspiration to enhance the evaporation of aspirated fuel portions in droplet form, including a Bernouilli constriction downstream from the carburetor, said constriction having an opening not substantially smaller than the opening in the carburetor venturi, said constriction comprising a tubular structure aligned with the fluid flow from the carburetor, said tubular structure having an exterior diameter substantially exceeding its interior diameter, and a droplet retaining filter device exteriorly attached to said tubular structure and extending downstream therefrom a distance at least equal to said interior diameter thereby to form a mixing chamber downstream from the Bernouilli constriction and upstream from the screen at least substantially equalling the volume within aid tubular structure.
Claim 4
Dependent Claim
171 words
In an internal combustion engine having a carburetor including a fuel aspirating nozzle in a venturi and a throttle valve controlling mixture passage to a manifold connecting the carburetor to an input port of a cylinder, the improvement for evaporating input fuel comprising in combination, means for reducing the pressure after carburation of the air-fuel mixture without further fluid aspiration to enhance the evaporation of aspirated fuel portions in droplet form, including a Bernouilli constriction downstream from the carburetor, said constriction having an opening not substantially smaller than the opening in the carburetor venturi, said constriction comprising a tubular structure aligned with the fluid flow from the carburetor, said tubular structure having an exterior diameter substantially exceeding its interior diameter, and a droplet retaining filter device exteriorly attached to said tubular structure and extending downstream therefrom a distance at least equal to said interior diameter thereby to form a mixing chamber downstream from the Bernouilli constriction and upstream from the screen at least substantially equalling the volume within aid tubular structure.
References Cited (Backward Citations)
FR741462A
Cited
US1311071A
Cited
US1315758A
Cited
US1007010A
Cited
US1282654A
Cited
US1260609A
Cited
US1394820A
Cited
US1530157A
Cited
US1462750A
Cited
US1515280A
Cited
DE755753C
Cited
FR969851A
Cited
US3414242A
Cited
US3393984A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |