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:
Nov. 16, 1993
Filed:
Apr. 12, 1991
Applicant:
Inventors:
Stanley T Hirozawa, Birmingham, MI (US);
David E Turcotte, Woodhaven, MI (US);
Assignee:
BASF Corporation, Parsippany, NJ (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09K / ; F28F / ;
U.S. Cl.
CPC ...
252 71 ; 252 75 ; 2523893 ; 422 14 ; 422 18 ;
Abstract
Non-corrosive anti-freeze solutions for automotive cooling systems include an anti-corrosive effective amount of a sodium silicate corrosion inhibitor, and sodium nitrate. The sodium silicate has an unusually low ratio of silica to sodium oxide of greater than 1.0 to about 2.4. This relatively low ratio of silica to sodium oxide prevents gelation from occurring while the synergistic combination of the sodium silicate and sodium nitrate maintains maximum anti-corrosive effectiveness of alcohol-based solutions containing the same.