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:
Mar. 08, 2011
Filed:
Mar. 14, 2003
Olaf Graupner, Köfering, DE;
Matthias Mundt, Hamburg, DE;
Andrea Schütze, Hamburg, DE;
Jurgen Jacobus Johannes Louis, Hamburg, DE;
David Roy Kendall, Chester, GB;
Nigel Peter Tait, Chester, GB;
Olaf Graupner, Köfering, DE;
Matthias Mundt, Hamburg, DE;
Andrea Schütze, Hamburg, DE;
Jurgen Jacobus Johannes Louis, Hamburg, DE;
David Roy Kendall, Chester, GB;
Nigel Peter Tait, Chester, GB;
Shell Oil Company, Houston, TX (US);
Abstract
The use of an effective concentration of a hydrocarbyl amine wherein the hydrocarbyl moiety has a number average molecular weight in the range 140 to 255 as an additive in an unleaded gasoline composition is provided containing a major proportion of a gasoline suitable for use in a spark ignition engine, for reducing injector nozzle fouling in a direct injection spark ignition engine. A method of operating a direct injection spark ignition engine is also provided.