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:
Jun. 28, 2005
Filed:
Aug. 22, 2002
Joseph Pierre Heremans, Troy, MI (US);
Su-chee Simon Wang, Troy, MI (US);
Thaddeus Schroeder, Rochester Hills, MI (US);
Louis L. Nagy, Warren, MI (US);
Joseph Pierre Heremans, Troy, MI (US);
Su-Chee Simon Wang, Troy, MI (US);
Thaddeus Schroeder, Rochester Hills, MI (US);
Louis L. Nagy, Warren, MI (US);
Delphi Technologies, Inc., Troy, MI (US);
Abstract
A method by which contaminant (soot) content in Diesel engine oil is determined using electrical conductivity measurements of the Diesel oil at a high frequency, or by which contaminant (soot and/or water and/or anitfreeze) content is determined using the ratio of electrical conductivity measurements of the Diesel oil at a high frequency to the electrical conductivity measurements of the Diesel oil at a low frequency. Both the conductivity ratio and the high frequency conductivity are essentially independent of the brand of oil. High frequency is defined to be above 2 MHz whereas low frequency is defined to be D.C. to about 1 kHz.