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. 11, 2006
Filed:
Nov. 26, 2003
Hugo Camenzind, Bern, CH;
Paul Dubs, Cham, CH;
Roger Martin, Rheinfelden, CH;
David Eliezer Chasan, Teaneck, NJ (US);
Gunnar Demme, Mahopac, NY (US);
James Robbins, Satsuma, AL (US);
Hugo Camenzind, Bern, CH;
Paul Dubs, Cham, CH;
Roger Martin, Rheinfelden, CH;
David Eliezer Chasan, Teaneck, NJ (US);
Gunnar Demme, Mahopac, NY (US);
James Robbins, Satsuma, AL (US);
Ciba Specialty Chemicals Corp., Tarrytown, NY (US);
Abstract
The invention relates to liquid sulphur-containing antioxidants and to compositions comprising them. The novel lubricant compositions comprise the reaction product of a selected group of 5-tert-butyl-4-hydroxy-3-methyl(or tert-butyl)phenyl substituted carboxylic acid esters with thiodiethylene glycol and a mono-hydroxy alcohol with a carbon chain length higher than 4 C-atoms. The novel lubricant compositions are highly resistant to oxidative degradation and are capable of reducing the negative effects of deposits, such as black sludge, in motor combustion engines, particularly spark ignition internal combustion engines.