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. 07, 2015
Filed:
Jun. 06, 2008
Stephen Arrowsmith, Didcot, GB;
Christopher J. Booth, Reading, GB;
Aubrey L. Burrows, Diss, GB;
Paul Wilson, Abingdon, GB;
Neal J. Milne, Ramsbury, GB;
Lin Wangkan, Bridgewater, NJ (US);
Jacob Emert, Brooklyn, NY (US);
Laurent Chambard, Englewood, NJ (US);
Stephen Arrowsmith, Didcot, GB;
Christopher J. Booth, Reading, GB;
Aubrey L. Burrows, Diss, GB;
Paul Wilson, Abingdon, GB;
Neal J. Milne, Ramsbury, GB;
Lin Wangkan, Bridgewater, NJ (US);
Jacob Emert, Brooklyn, NY (US);
Laurent Chambard, Englewood, NJ (US);
Abstract
Para-alkylated substituted diphenylamines are made by catalytically alkylating diphenylamine with a branched-chain alkene, such as propene, oligomer mixture in which the oligomer present in the greatest percentage has 15-24 carbon atoms. The alkylated diphenylamines are useful crankcase lubricant additives such as for reducing piston deposits and engine sludge.