Patents by Inventor Duane W. Sampson

Duane W. Sampson 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).

  • Method of cleaning scale and stains in water systems and related equipment
    Patent number: 5492629
    Abstract: A method for removing scale and stains from the interior surfaces of a water-containing system having a reservoir, auxiliary equipment and piping, without having to drain the water from the system. The use of inhibited mineral acid allows the water to be circulated throughout the entire system, cleaning all interior surfaces without damaging them. Once scale and stains are removed, the water is neutralized.
    Type: Grant
    Filed: October 12, 1993
    Date of Patent: February 20, 1996
    Assignee: H.E.R.C. Products Incorporated
    Inventors: Jerome H. Ludwig, Duane W. Sampson