Patents by Inventor Michael Askren

Michael Askren 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).

  • Aluminum based phosphate final rinse
    Patent number: 5128211
    Abstract: A final rinse for a phosphatized metal surface includes a phosphoric acid solution including aluminum chlorohydrate. The aluminum chlorohydrate solution is applied at a concentration of about 100 to about 1500 ppm at a pH of 3 to about 4.5. The pH is obtained by controlling the concentration of the phosphoric acid. This is preferably used to coat previously phosphatized metal surfaces such as iron, steel, aluminum and galvanize.
    Type: Grant
    Filed: February 28, 1991
    Date of Patent: July 7, 1992
    Assignee: Diversey Corporation
    Inventors: Thomas C. Tesdahl, Charles Ficker, Michael Askren