Patents by Inventor John Robert Dunn

John Robert Dunn 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).

  • Vulcanizable elastomeric compositions
    Patent number: 4020039
    Abstract: Improved vulcanizable elastomeric compositions are provided which contain a vulcanization co-agent, the improvements being found in, separately or in combination, the scorch time and compression set and in the stress-strain and aging properties of the vulcanizates thereof.
    Type: Grant
    Filed: February 28, 1975
    Date of Patent: April 26, 1977
    Assignee: Polysar Limited
    Inventors: John Robert Dunn, Douglas Currie Coulthard