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:
Jul. 15, 1997
Filed:
Apr. 12, 1996
Applicant:
Inventors:
Brian W Mulshine, Carol Stream, IL (US);
Edward H Howell, III, Wheaton, IL (US);
Alan P Haag, Western Springs, IL (US);
Assignee:
Navistar International Transportation Corp., Chicago, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F01P / ;
U.S. Cl.
CPC ...
123 4115 ; 204404 ;
Abstract
An engine coolant additive sensor comprises two sections, each made of dissimilar metals which have a single point of contact therebetween. A closed circuit is formed through this point of contact and such point is placed into the engine coolant. When additives become depleted in the coolant, corrosion of one metal takes place breaking the closed circuit and creating an indication that coolant additive maintenance is required. Once maintenance is performed, the point of contact is reestablished, resetting the circuit.