Patents by Inventor Kohsaku Aoki

Kohsaku Aoki 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).

  • Composition for forming chromate coating
    Patent number: 4126490
    Abstract: Compositions for forming chromate coatings on zinc metal or zinc alloys typically contain water as a solvent with hexavalent chromium compounds therein as active ingredients. Such hexavalent chromium compounds are environmentally undesirable. An aqueous composition for forming a chromate coating on zinc metal or zinc alloys is provided which does not contain hexavalent chromium compounds. The composition contains a trivalent chromium compound, an alum and a vanadate.
    Type: Grant
    Filed: May 1, 1978
    Date of Patent: November 21, 1978
    Assignee: Caterpillar Mitsubishi Ltd.
    Inventor: Kohsaku Aoki