US3695593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carburettor containing porous material e. g. foamed plastic
Assignee: Imperial Chemical Industries Ltd
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Filing: 1970-09-10
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Granted: 1972-10-03
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Expires: 1990-09-10
Abstract
Abstract A carburettor, particularly for use with a petrol driven internal combustion engine, having a porous member, means for supplying petrol to it via a metering orifice from a constant level reservoir, means whereby the vacuum produced by the engine draws air through the porous member to produce a petrol/air mixture and a shutter located close to the downstream face of the porous member and adapted to move across the said face so as to shield progressively a variable area thereof and thus concentrate the air flow through certain zones of the porous member. The carburettor should be cheaper to manufacture than conventional carburettors, with which its performance compares favorably.
Inventors
- 👤 Harvey Ernest Postlethwaite
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:58
CPC Classifications
F; F02; F02M; F02M17/00; F02M17/18; F02M17/26; F02M17/28; F02B; F02B1/00; F02B1/02; F02B1/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
22 words
A carburetor as claimed in claim 1 in which the porous member fills a section of the bore of the said passage.
Claim 2
Dependent Claim
51 words
A carburetor as claimed in claim 1 in which the shutter takes the form of a slide having at least one flat face, arranged so that its leading edge may be caused to traverse the bore of the passage from one edge to the other to provide the said progressive shielding.
Claim 3
Dependent Claim
37 words
A carburetor as claimed in claim 1 in which the axial distance between the shutter and the shielded face of the porous member is not more than one quarter of the maximum dimension of the shielded face.
Claim 4
Dependent Claim
24 words
A carburetor as claimed in claim 4 in which the shutter is located as close to the said shielded face as is mechanically convenient.
Claim 5
Dependent Claim
37 words
A carburetor as claimed in claim 1 in which an open cell foamed material; formed by foaming a liquid or molten material and causing it to solidify in the foamed condition, is used as the porous member.
Claim 6
Dependent Claim
20 words
A carburetor as claimed in claim 6 in which the material is selected from polymeric, metal and metallized foamed materials.
Claim 7
Dependent Claim
23 words
A carburetor as claimed in claim 1 in which the porous member comprises a packed mass of inert fibrous, filamentary or particulate material.
Claim 8
Dependent Claim
25 words
A carburetor as claimed in claim 1 in which the petrol supply means includes a metering orifice through which petrol passes to the porous member.
Claim 9
Dependent Claim
54 words
A carburetor as claimed in claim 1 which is provided with means whereby the petrol may be supplied to the porous member from a constant level reservoir, the level of which is maintainable at or slightly below the point at which petrol is introduced into the porous member when in its normal working position.
Claim 10
Dependent Claim
50 words
A carburetor as claimed in claim 1 in which a minor portion of the porous member is segregated from the rest and provided with its own petrol supply means, said minor portion being located in that part of the porous member which is last shielded during the said progressive shielding.
Claim 11
Dependent Claim
29 words
A carburetor as claimed in claim 11 in which the minor portion of the porous member has a lower porosity than that of the rest of the porous member.
Claim 12
Dependent Claim
19 words
In combination with a petrol-driven internal combustion engine including an inlet manifold, a carburetor as defined in claim 1.
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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) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |