Patents by Inventor John Cooper Crowther

John Cooper Crowther 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).

  • Chromium electroplating
    Patent number: 4093521
    Abstract: Improved trivalent chromium electroplating baths containing from about 30 to about 150 parts per million of iron or nickel content, or from about 30 to about 150 parts per million of iron plus nickel with the nickel in an amount up to about 100 parts per million.
    Type: Grant
    Filed: June 28, 1977
    Date of Patent: June 6, 1978
    Inventors: Stanley Renton, John Cooper Crowther
  • Method of regenerating a chromium electroplating bath
    Patent number: 4038160
    Abstract: Trivalent chromium electroplating baths which have developed characteristic faults due to accumulation of trace metal contaminants are treated with just sufficient of a water soluble ferrocyanide to restore the bath to normal working order.
    Type: Grant
    Filed: July 2, 1976
    Date of Patent: July 26, 1977
    Assignee: Albright & Wilson Limited
    Inventors: John Cooper Crowther, Stanley Renton