Patents by Inventor Frederik C. Blees

Frederik C. Blees 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 and apparatus for preparing concrete mortar
    Patent number: 4881819
    Abstract: The invention relates to a method and apparatus for preparing concrete mortar. In order to regulate the moisture content of the concrete mortar a sand sample is taken of the sand used. This sand sample is dried. The amount of water added to a concrete charge is regulated subject to the weight difference of the sand sample prior to and after drying.
    Type: Grant
    Filed: January 20, 1988
    Date of Patent: November 21, 1989
    Assignee: Deltracon Deventer B.V.
    Inventor: Frederik C. Blees