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:
Jan. 28, 2020
Filed:
Sep. 23, 2016
Applicant:
Macdermid Enthone Inc., Waterbury, CT (US);
Inventors:
Andreas Konigshofen, Leverkusen, DE;
Maik Winkler, Leipzig, DE;
Assignee:
MacDermid Enthone Inc., Waterbury, CT (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C25D 21/06 (2006.01); C25D 3/06 (2006.01); C25D 3/10 (2006.01); C25D 21/12 (2006.01);
U.S. Cl.
CPC ...
C25D 21/06 (2013.01); C25D 3/06 (2013.01); C25D 3/10 (2013.01); C25D 21/12 (2013.01);
Abstract
The invention relates to a method for the adjustment of the lightness L* of electrolytically deposited chromium-finishes on workpieces obtained by an electroplating bath comprising at least chromium(III)-ions and sulfur containing organic compounds, wherein the concentration of the sulfur containing organic compounds in the bath are adjusted by passing at least part of the bath composition through an activated carbon filter. Furthermore, the invention is directed to dark chrome coatings comprising a defined concentration gradient of deposited sulfur containing organic compounds.