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. 29, 1985
Filed:
Jun. 27, 1983
Applicant:
Inventor:
Delbert A Nauman, Indianapolis, IN (US);
Assignee:
AT&T Technologies, Inc., New York, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01N / ;
U.S. Cl.
CPC ...
204 / ; 204400 ;
Abstract
A method of producing a high color contrast between nickel and/or copper or their various alloys and a noble metal or noble metal alloy such as in electrical contacts having a nickel or copper base with an overlay of a noble metal or a noble metal alloy bonded to the surface of the base. By making the contact one electrode in an aqueous solution of a readily soluable ionizable solute and impressing a low AC voltage across the solution, a reaction occurs which makes the base of the electrical contact easily visually distinguishable from the metal overlay.