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. 20, 2004
Filed:
Nov. 01, 2000
David Roy Kendall, Chester, GB;
Shell Oil Company, Houston, TX (US);
Abstract
The invention provides an additive concentrate which comprises an oil soluble hydrocarbyl poly(oxyalkylene) aminocarbamate having a number average molecular weight (M ) in the range 600 to 10,000 having at least one basic nitrogen atom wherein said hydrocarbyl group contains 1-30 carbon atoms, and an oil soluble hydrocarbyl amine of formula R—NH wherein R represents a group R′ or a group R′—CH —, wherein R′ represents a hydrocarbyl group having a number average molecular weight (M )in the range 750 to 6,000; a gasoline composition containing such additive concentrate; and its preparation; and a method of operating a spark-ignition engine using such gasoline composition.