JAMES N TUTTLE
Broker in Harwichport, MA
License number
Massachusetts 52702
Issued Date
May 1, 1984
Expiration Date
Aug 29, 2000
Type
Salesperson
Address
Address
Harwichport, MA 02646
Professional information
Metal Coloring Process
US Patent:
5723183, Mar 3, 1998
Filed:
Sep 16, 1996
Appl. No.:
8/714550
Inventors:
Richard K. Williams - Minnetonka MN
David J. Halverson - Long Lake MN
James N. Tuttle - Harwich Port MA
David J. Halverson - Long Lake MN
James N. Tuttle - Harwich Port MA
Assignee:
Birchwood Laboratories, Inc. - Eden Prairie MN
International Classification:
B05D 138, B05D 300, C23C 2284
US Classification:
427409
Abstract:
The invention is the chemical composition and method for forming a chemical conversion coating on ferrous metal surfaces and subsequent coloring of said conversion coating through the application of a water-soluble dye. The conversion coating has an ordered crystalline structure composed of ferrous oxalate or other ferrous dicarboxylates. The conversion coating can be colored through the application of a water-soluble reactive dye which bonds with Fe (II) within the ferrous dicarboxylate matrix, bound to the dicarboxylate molecules, thereby becoming water insoluble and permanent. When sealed with an appropriate rust preventive top coat, the result is an attractive and protective finish of minimal thickness which can be applied through simple immersion process techniques. Said finish can serve as a final protective finish on a fabricated ferrous metal article and also affords a degree of lubricity for assembly, break-in purposes, or anti-galling protection and serves as an adhesive base for paint.