Patents by Inventor Albert N. Crawford

Albert N. Crawford 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 dispersions and method of preparing same
    Patent number: 4780147
    Abstract: Stable vermiculite dispersions which are substantially free of settling and a method of preparing same are provided. The dispersion are obtained by treating the vermiculite platelets of which the dispersion is comprised with citrate anion. The citrate anion functions as a swelling agent for the vermiculite and enhances the rate and extent of swelling in an aqueous medium. The swollen vermiculite is delaminated by shearing to provide the inventive dispersions, which comprise a suspension of the delaminated platelets and citrate anion.
    Type: Grant
    Filed: March 19, 1987
    Date of Patent: October 25, 1988
    Assignee: W. R. Grace & Co.
    Inventors: Chia-Chih Ou, Albert N. Crawford