Patents by Inventor Thomas C. Tesdahl

Thomas C. Tesdahl 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
  • Controlled foam detergent additive
    Patent number: 4230592
    Abstract: Liquid additive for caustic soda cleaning solutions. Provides surfactants, foam control, and scale control; and good wetting and emulsifying properties for improved cleaning and ease of rinsing.
    Type: Grant
    Filed: May 31, 1979
    Date of Patent: October 28, 1980
    Assignee: Chemed Corporation
    Inventors: Jack Miller, Thomas C. Tesdahl
  • Foam cleaner for food plants
    Patent number: 4228048
    Abstract: Liquid cleaning and bleaching concentrate which generates copious foam on dilution with water in a mechanical foam generator. Contains modified polyacrylic acid salt, sodium tripolyphosphate, sodium hydroxide, sodium silicate, sodium hypochlorite sodium alkane sulfonate, and (optionally) sodium polyacrylate.
    Type: Grant
    Filed: May 25, 1979
    Date of Patent: October 14, 1980
    Assignee: Chemed Corporation
    Inventor: Thomas C. Tesdahl