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. 17, 2001
Filed:
Aug. 24, 1999
Applicant:
Inventor:
Jiafu Fang, Spring, TX (US);
Assignee:
Pennzoil-Quaker State, Houston, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01N 2/726 ;
U.S. Cl.
CPC ...
G01N 2/726 ;
Abstract
A method and apparatus uses a flow injection technique for rapidly and accurately determining the level of one or more additives such as antioxidants and/or antiwear agents in a hydrocarbon fluid such as an engine oil. The hydrocarbon fluid is injected into a mobile phase using a microemulsion or organic solvent as the mobile phase and pumped through an electrochemical detection sensor. The electrochemical detention sensor accurately and quickly provides a sharp signal identifying the electroactive species in the hydrocarbon fluid.