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:
Sep. 16, 1986
Filed:
Feb. 25, 1985
Applicant:
Inventors:
Ryuiji Kojima, Tokyo, JP;
Naomi Suzuki, Tokyo, JP;
Yokichi Sato, Tokyo, JP;
Tsuneo Saito, Kanagawa, JP;
Assignee:
Parker Chemical Company, Madison Heights, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C23C / ;
U.S. Cl.
CPC ...
148 / ;
Abstract
A process for controlling the zinc or zinc and nickel content of a zinc phosphate conversion coating solution employs the addition of EDTA and titration with calcium ion using a calcium ion electrode. Preferably to a second sample is added EDTA and a thioglycolate and the same titration conducted to obtain the concentration of nickel ion for direct control purposes.