Patents by Inventor Douglas Cameron Edwards

Douglas Cameron Edwards 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).

  • Mineral oil compositions with an isobutylene polymer containing bound 2,6-di-t-butyl phenol groups
    Patent number: 4101434
    Abstract: Mineral oil compositions of improved characteristics comprise a major proportion of a mineral oil and a minor proportion of an isobutylene polymer containing bound 2,6-di-t-butyl phenol groups.
    Type: Grant
    Filed: April 20, 1977
    Date of Patent: July 18, 1978
    Assignee: Polysar Limited
    Inventors: Douglas Cameron Edwards, John Walker
  • Particulate oil-black masterbatch
    Patent number: 4026933
    Abstract: Synthetic rubber-black-plasticizer masterbatches are prepared in a particulate form, in contrast with their normal massed form, by a process which involves halogenating the rubber-black masterbatch after coagulation, but before addition of the plasticizer.
    Type: Grant
    Filed: February 9, 1976
    Date of Patent: May 31, 1977
    Assignee: Polysar Limited
    Inventors: Douglas Cameron Edwards, Erhardt Fischer