Patents by Inventor Hans C. Killingstad

Hans C. Killingstad 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).

  • Patent number: 8051861
    Abstract: A cleaning system includes a supply of purified water, a supply of cleaning agent, a mixing junction, and a distributor. The mixing junction is configured to combine a flow of the purified water and a flow of the cleaning agent and output a flow of cleaning liquid comprising the flows of the purified water and the cleaning agent. The distributor includes an output through which the cleaning liquid can be discharged. In a method of cleaning a surface, flows of purified water and cleaning agent are provided. The flow of purified water and the flow of cleaning agent are mixed to form a flow of cleaning liquid. The flow of cleaning liquid is then discharged to the surface.
    Type: Grant
    Filed: January 13, 2006
    Date of Patent: November 8, 2011
    Assignee: Tennant Company
    Inventors: Bruce F. Field, Hans C. Killingstad