Patents by Inventor Piet H. Isselmann

Piet H. Isselmann 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).

  • Accelerator for setting of cements
    Patent number: 4298392
    Abstract: The present disclosure relates to a class of additives for hydraulic cement which accelerate the setting of the cement. More particularly the present invention relates to an additive for Portland cement comprising a silica sol and one or more rhodanides and to cementitious compositions containing such additives.
    Type: Grant
    Filed: June 5, 1980
    Date of Patent: November 3, 1981
    Assignee: Akzona Incorporated
    Inventor: Piet H. Isselmann