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. 25, 1986
Filed:
Feb. 01, 1985
Applicant:
Inventors:
Ernest L Yeakey, Austin, TX (US);
George P Speranza, Austin, TX (US);
Carol A Triebel, Austin, TX (US);
David R McCoy, Austin, TX (US);
Assignee:
Texaco, Inc., White Plains, NY (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C09K / ;
U.S. Cl.
CPC ...
252 76 ; 252 73 ; 252 79 ; 252 82 ; 25217418 ; 252180 ; 252396 ; 562595 ;
Abstract
The use of methylene azelaic acid having the formula CH.sub.2 .dbd.C--[(CH.sub.2).sub.3 --COOH].sub.2 or an alkali metal salt thereof in glycol and water based automotive antifreeze formulations is described. Unlike natural dicarboxylic acids such as sebacic acid, methylene azelaic acid does not form a precipitate and drop out of solution, rendering the antifreeze unprotected against corrosion. The methylene azelaic acid component should be present in an amount of from 1.5 to 4.5 wt. % based on the glycol component.