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. 14, 1992
Filed:
Oct. 18, 1990
Applicant:
Inventor:
Don Dupree, Alta Loma, CA (US);
Assignee:
Optical Radiation Corporation, Azusa, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C25D / ; C25D / ; C25D / ; C25D / ;
U.S. Cl.
CPC ...
205 94 ; 204228 ; 204277 ; 204278 ; 204130 ;
Abstract
A low mist chromium plating system is disclosed which comprises a closed plating tank containing chromium plating solution preferably covered by a layer of mist suppressing foam. Nitrogen carrier gas is introduced into the plating tank above the plating solution and carries chromium mist to a series of aqueous traps. The first trap contains sodium bisulfite for reducing hexavalent chromium ions to trivalent chromium ions. The last trap contains 1,5-diphenylcarbohydrazide for indicating the presence of hexavalent chromium.