Patents by Inventor David Calder Chalmers

David Calder Chalmers 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).

  • Halogenated polyacrylate elastomers
    Patent number: 4069180
    Abstract: Polyacrylate elastomers are prepared by polymerizing a mixture of an acrylate monomer and a diolefin such as isoprene to yield a polymer containing carbon-to-carbon unsaturation and this polymer is then treated with bromine to yield a bromine containing acrylate polymer which is curable with zinc oxide, zinc oxide and sulphur or sulphur and alkali metal salts of fatty acids.
    Type: Grant
    Filed: July 30, 1975
    Date of Patent: January 17, 1978
    Assignee: Polysar Limited
    Inventor: David Calder Chalmers