Patents by Inventor James M. Vigar

James M. Vigar has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Electrodeposition of chromium and its alloys
    Patent number: 4502927
    Abstract: A trivalent chromium electroplating solution containing trivalent chromium ions, a complexant, a buffer and an organic compound having a --C.dbd.S group or a --C--S-- group. The complexant is selected to give the chromium complex a stability constant, K.sub.1, in the range 10.sup.8 <K.sub.1 <10.sup.12 M.sup.-1.
    Type: Grant
    Filed: November 1, 1982
    Date of Patent: March 5, 1985
    Assignee: International Business Machines Corporation
    Inventors: Donald J. Barclay, William M. Morgan, James M. Vigar
  • Bath and process for the electrodeposition of chromium
    Patent number: 4472250
    Abstract: A trivalent chromium electroplating solution containing trivalent chromium ions, a complexant, a buffer and thiocyanate ions. The thiocyanate is of a molar concentration which is lower than the molar concentration of the chromium ions, and the chromium ion concentration being lower than 0.1 M. The stability constant, K.sub.1, of the solution's chromium complex is in the range 10.sup.8 <K.sub.1 <10.sup.12 M.sup.-1.
    Type: Grant
    Filed: November 1, 1982
    Date of Patent: September 18, 1984
    Assignee: International Business Machines Corporation
    Inventors: Donald J. Barclay, William M. Morgan, James M. Vigar
  • Trivalent chromium electroplating baths
    Patent number: 4448649
    Abstract: A trivalent chromium electroplating solution containing trivalent chromium ions, a complexant, a buffer and a sulphur species selected from sulphites and dithionites, the complexant being selected to impart a stability constant, K.sub.1, to the chromium complex which is in the range 10.sup.6 <K.sub.1 <10.sup.12 M.sup.-1. The chromium ion molar concentration is lower than 0.01M. The complexant is selected from aspartic acid, iminodiacetic acid, nitrilotriacetic acid, 5-sulphosalicylic acid or citric acid.
    Type: Grant
    Filed: November 1, 1982
    Date of Patent: May 15, 1984
    Assignee: International Business Machines Corporation
    Inventors: Donald J. Barclay, William M. Morgan, James M. Vigar
  • Trivalent chromium electroplating baths
    Patent number: 4448648
    Abstract: A trivalent chromium electroplating solution containing trivalent chromium ions, a complexant, a buffer and a sulphur species having S--O or S--S bonds. The complexant is selected to give the chromium complex a stability constant, K.sub.1, in the range 10.sup.6 <K.sub.1 <10.sup.12 M.sup.-1.
    Type: Grant
    Filed: November 1, 1982
    Date of Patent: May 15, 1984
    Assignee: International Business Machines Corporation
    Inventors: Donald J. Barclay, William M. Morgan, James M. Vigar
  • Method of brightening electrodeposited chromium
    Patent number: 4196062
    Abstract: A method for brightening an electroplated chromium deposit wherein the deposited chromium is contacted with a solution having a constituent capable of forming complexes with chromium hydroxide species and of detaching the complexes so formed from the surface of an electroplated deposit. Preferably the solution is an alkaline ferricyanide solution or a solution of sodium dichromate in sulphuric acid.
    Type: Grant
    Filed: November 20, 1978
    Date of Patent: April 1, 1980
    Assignee: International Business Machines Corporation
    Inventors: Donald J. Barclay, James M. Vigar