Patents by Inventor Richard F. Zuendt

Richard F. Zuendt 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).

  • Non-chromate conversion coatings
    Patent number: 4225350
    Abstract: Improved color, brightness and corrosion resistance are imparted to metal surfaces such as zinc plated surfaces, by treatment with a non-toxic solution comprised of sulfuric acid, hydrogen peroxide, a silicate and at least one cationic triarylmethane dye. Certain organophosphorus compound additives further enhance the corrosion resistance.
    Type: Grant
    Filed: June 4, 1979
    Date of Patent: September 30, 1980
    Assignee: Dart Industries Inc.
    Inventors: John L. H. Allan, Philip D. Readio, Ajay M. Bengali, Richard F. Zuendt
  • Non-chromate conversion coatings
    Patent number: 4225351
    Abstract: Improved brightness and corrosion resistance are imparted to metal surfaces such as zinc plated surfaces, by treatment with a non-toxic solution comprised of sulfuric acid, hydrogen peroxide, a silicate, certain primary organophosphorus compound promoters and at least one secondary promoter selected from ascorbic acid, boric acid, gluconic acid, glycolic acid, tartaric acid and salts of said acids.
    Type: Grant
    Filed: June 4, 1979
    Date of Patent: September 30, 1980
    Assignee: Dart Industries Inc.
    Inventors: Richard F. Zuendt, Ajay M. Bengali, Philip D. Readio, John L. H. Allan
  • Non-chromate conversion coatings
    Patent number: 4222779
    Abstract: Improved brightness and corrosion resistance are imparted to metal surfaces such as zinc plated surfaces, by treatment with a non-toxic solution comprised of sulfuric acid, hydrogen peroxide and a silicate. Certain organophosphorus and organonitrogen compound additives further enhance the corrosion resistance.
    Type: Grant
    Filed: June 4, 1979
    Date of Patent: September 16, 1980
    Assignee: Dart Industries Inc.
    Inventors: Ajay M. Bengali, Richard F. Zuendt, John L. H. Allan, Philip D. Readio