Patent US4300494A successfully refreshed from Google Patents.
US4300494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal insulated intake ports
Assignee: Shell USA Inc
•
Filing: 1979-09-26
•
Granted: 1981-11-17
•
Expires: 1999-09-26
Abstract
Abstract Reduced fuel consumption of spark ignition reciprocating internal combustion engines is achieved by coating the intake port area of the engine with a thermally insulating material.
Inventors
- 👤 Leonard B. Graiff
- 👤 Earl J. Haury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:49
CPC Classifications
F; F02; F02B; F02B77/00; F02B77/11; F02B1/00; F02B1/02; F02B1/04; F02B75/00; F02B75/02; F02B2075/022; F02B2075/027
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
122 words
In a spark ignition reciprocating internal combustion engine for use with gasoline fuels said engine having an intake port area extending between an intake manifold and an intake valve, said valve disrupting flow of a fuel air mixture into a combustion chamber; the improvement which comprises having a substantial portion of the surface of said intake port area coated with a thermal insulating material for reducing transfer of heat to the fuel/air mixture which traverses said intake port area during operation of said engine, said insulating material consisting essentially of one of the group of polyphenylene sulfide alone and polyphenylene sulfide in combination with synthetic resinous polymeric materials having in their chemical structure at least one element selected from fluorine and silicon.
Claim 2
Dependent Claim
122 words
In a spark ignition reciprocating internal combustion engine for use with gasoline fuels said engine having an intake port area extending between an intake manifold and an intake valve, said valve disrupting flow of a fuel air mixture into a combustion chamber; the improvement which comprises having a substantial portion of the surface of said intake port area coated with a thermal insulating material for reducing transfer of heat to the fuel/air mixture which traverses said intake port area during operation of said engine, said insulating material consisting essentially of one of the group of polyphenylene sulfide alone and polyphenylene sulfide in combination with synthetic resinous polymeric materials having in their chemical structure at least one element selected from fluorine and silicon.
Claim 3
Dependent Claim
26 words
A spark ignition engine as in claim 1 wherein the engine has a plurality of combustion chambers and a plurality of thermally insulated intake port areas.
Claim 4
Dependent Claim
25 words
A spark ignition engine as in claim 1 wherein the insulating material has a thermal conductance of from about 30 B.T.U./hr/sq.ft/°F. to about 5000 B.T.U./hr/sq.ft/°F.
Claim 5
Dependent Claim
26 words
A spark ignition engine as in claim 1 wherein the insulating material has a thermal conductance of from about 50 BTU hr/sq.ft/°F. to about 1000 BTU/hr/sq.ft/°F.
Claim 6
Dependent Claim
28 words
A spark ignition engine as in claim 1 wherein the insulating material which contains fluorine in its chemical structure is selected from polytetrafluoroethylene and fluorinated ethylene propylene copolymer.
Claim 7
Dependent Claim
29 words
A spark ignition engine as in claim 1 wherein the insulating material which contains silicon in its chemical structure is selected from silicone homopolymers and copolymers and polysiloxane resins.
Claim 8
Independent Claim
80 words
A method for reducing the fuel consumption of gasoline fueled spark ignition engine having an intake port area extending between an intake manifold and an intake valve comprising coating a substantial portion of the surfaces of said intake port area with a thermally insulating material consisting essentially of one of the group of polyphenylene sulfide alone and polyphenylene sulfide in combination with synthetic resinous polymeric materials having in their chemical structure at least one element selected from fluorine, and silicon.
Claim 9
Independent Claim
80 words
A method for reducing the fuel consumption of gasoline fueled spark ignition engine having an intake port area extending between an intake manifold and an intake valve comprising coating a substantial portion of the surfaces of said intake port area with a thermally insulating material consisting essentially of one of the group of polyphenylene sulfide alone and polyphenylene sulfide in combination with synthetic resinous polymeric materials having in their chemical structure at least one element selected from fluorine, and silicon.
Claim 10
Dependent Claim
24 words
A method as in claim 7 wherein said insulating material has a thermal conductance from about 30 BTU/hr/sq.ft/° F. to about 5000 BTU/hr/sq.ft/° F.
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) | 1984-11-16 | 1985-05-18 | 1985-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-16 | 1989-05-18 | 1989-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-16 | 1993-05-18 | 1993-11-17 | $7700.00 | Window Closed / Lapsed |