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:
May. 22, 1984
Filed:
Jul. 28, 1982
Warren H McMullen, East Brunswick, NJ (US);
Hyman Chessin, Brick Township, Ocean County, NJ (US);
Denise Siracusa, Staten Island, NY (US);
M&T Chemicals Inc., Woodbridge, NJ (US);
Abstract
Nickel and/or zinc contamination can be handled by increasing the bath's level of tolerance to nickel and zinc, thereby eliminating the need to use precipitants. The instant invention relates to the use in a trivalent chromium bath contaminated with zinc and/or nickel, or an effective amount of a compound represented by the formula R-S, where S is selected from the group consisting of sulfinates, sulfonates, and the acids and soluble salts thereof, and R is either an aliphatic group having from 1 to 6 carbons, or an aromatic or heterocyclic group having up to 12 carbons. Preferably R is an unsaturated hydrocarbon and contains carbon to carbon unsaturation alpha or beta to the sulfur atom.