Patents by Inventor Ralph A. Larson

Ralph A. Larson 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).

  • Apparatus for providing a regenerant solution to a regenerable liquid treatment medium bed
    Patent number: 5363087
    Abstract: A liquid treatment apparatus or system having a liquid treatment medium bed which is regenerated by passing through it a solution formed by dissolving a solid in a liquid. An automatic control system initiates a regeneration cycle when necessary. Indicia are provided in association with the container containing the solid material such that an appropriate indicia will represent the amount of solid material in the container. By providing the control circuit with the indicia, the control circuit will record the amount of solid material remaining and initiate an alarm when the amount of solid material remaining is below a predetermined level.
    Type: Grant
    Filed: July 20, 1993
    Date of Patent: November 8, 1994
    Assignee: Ecowater Systems, Inc.
    Inventors: James Johannsen, Ralph A. Larson, Jeffrey A. Zimmerman