The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 02, 1996
Filed:
Apr. 26, 1994
Leonard B Graiff, Houston, TX (US);
Robert P Aiello, Cypress, TX (US);
H Dale Millay, Houston, TX (US);
Michael J Riley, Houston, TX (US);
Kevin W Poindexter, Katy, TX (US);
Shell Oil Company, Houston, TX (US);
Abstract
Intake valve deposits in port fuel injected engines are reduced by using a fuel containing a mixture of (a) an oil soluble polyamine selected from (i) an aliphatic alkylene polyamine containing at least one olefinic polymer chain attached to a nitrogen and/or carbon atom of the alkylene radical(s) connecting the amino nitrogen atoms and said polyamine having a number average molecular weight in the range of from about 600 to about 10,000, (ii) a Mannich polyamine comprising the condensation product of a high molecular weight sulfur-free alkyl-substituted hydroxyaromatic compound wherein the alkyl group has a number average molecular weight from about 600 to about 10,000, an amine which contains an amino group having at least one active hydrogen atom, and an aldehyde, wherein the respective molar ratio of reactants is 1:0.1-10:0.1-10, or (iii) mixtures of (i) and (ii) and (b) an oil soluble hydrocarbyl poly(oxyalkylene)aminocarbamate having a number average molecular weight in the range of from about 600 to about 10,000 having at least one basic nitrogen atom wherein the hydrocarbyl group contains from 1 to about 30 carbons atoms, and wherein the mixture is present in an amount of 5-1000 ppmw basis the fuel and the weight ratio of component (a) to component (b) ranges from about 3:1 to about 1:2. The fuels are also compatible with carburetor and throttle body injected engines.