Patents by Inventor Lloyd E. Steinke

Lloyd E. Steinke 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).

  • Concrete mixing drum cleaning method and apparatus
    Patent number: 5244498
    Abstract: The present invention relates to a method of retarding the set of residual concrete in a concrete holding vessel comprising uniformly directing an aqueous solution containing an effective amount of a set retarding agent against the residual concrete on the inner surface of said concrete holding vessel with sufficient pressure to retard concrete set with less than about 3 gallons of aqueous solution per every 10 lbs. of residual concrete. The present invention also relates to an apparatus which utilizes a minimal amount of wash water.
    Type: Grant
    Filed: April 9, 1991
    Date of Patent: September 14, 1993
    Assignee: W. R. Grace & Co. of Canada Ltd.
    Inventor: Lloyd E. Steinke