Patents by Inventor Keith A. Callander

Keith A. Callander 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).

  • Synthetic clay
    Patent number: 5026744
    Abstract: A nontacky, shock absorbing rubber composition suitable for replacing the natural clay used in horseshoe pits to absorb the energy of a thrown horseshoe, said composition comprising butyl rubber, crosslinked butyl rubber, cellulose fibre, particulate filler and plasticizer.
    Type: Grant
    Filed: January 17, 1989
    Date of Patent: June 25, 1991
    Assignee: Polysar Limited
    Inventor: Keith A. Callander
  • Process for preparing curable compounds
    Patent number: 4433077
    Abstract: A process is provided for the production of soft compounds which are curable by heat to rubbery elastomers which process comprises mixing in a trough type blade mixer a butadiene-acrylonitrile polymer, filler, tackifying resin, plasticizer, a polymerizable monomer and an organic peroxidic compound. The soft compounds may be used as gunnable or spreadable compounds or for gasketing or jointing purposes and cured in situ.
    Type: Grant
    Filed: August 23, 1982
    Date of Patent: February 21, 1984
    Assignee: Polysar Limited
    Inventor: Keith A. Callander