Patents by Inventor Poppe de Rook

Poppe de Rook 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).

  • Process for preparing frost resistant concrete
    Patent number: 4057526
    Abstract: A process is provided for making frost resistant cement products having improved 28 day compressive strengths wherein a gas is included in the product by substantially uniformly dispersing hollow gas filled synthetic polymeric spheres in the cement mixture prior to setting thereof. The invention also provides a frost resistant cement product having from about 0.01 to about 0.1% by weight based on the weight of cement of synthetic polymer spheres filled with air and having a diameter of from about 10 to about 100 .mu.m substantially uniformly dispersed therein.
    Type: Grant
    Filed: May 6, 1976
    Date of Patent: November 8, 1977
    Assignee: Akzo N.V.
    Inventor: Poppe de Rook