Patents by Inventor John Charles Davidtz

John Charles Davidtz 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).

  • Vermiculite products produced by exfoliation pulverization and calcination
    Patent number: 3953357
    Abstract: A process for the preparation of vermiculite particles having enhanced properties which comprises exfoliating crude vermiculite without substantially changing its structural strength, pulverizing the exfoliated particles and subjecting them to a heat treatment so as to cause at least partial calcination.
    Type: Grant
    Filed: March 14, 1974
    Date of Patent: April 27, 1976
    Assignee: Mandoval Vermiculite (Proprietary) Limited
    Inventors: Ian Preston, John Charles Davidtz