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. 04, 1976
Filed:
Jun. 24, 1975
Jacob Hyner, Waterbury, CT (US);
Stephen Gradowski, Torrington, CT (US);
Whyco Chromium Co., Inc., Thomaston, CT (US);
Abstract
The present invention provides a method of improving the corrosion resistance of a ferrous metal substrate by providing a non-ferrous corrosion resistant plated undercoating by steps of sequentially plating onto the substrate a first layer of copper of about 0.00015 to 0.0005 inches in thickness, a layer of zinc of about 0.0002 to 0.0005 inches in thickness and a second layer of copper of about 0.00015 to 0.0005 inches in thickness and, optionally, multiples of such zinc and copper layers, and thereafter subjecting the plated substrate to a thermal treatment sufficient to effect partial diffusion at the respective interfaces of each of the layers of copper and zinc to provide zones of non-homogeneous copper-zinc alloy of infinitely variable linear distribution of copper and zinc.