Patents by Inventor Douglas Coulthard

Douglas Coulthard 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).

  • Elastomeric blends
    Patent number: 3943192
    Abstract: In the blending of a polymer of chloroprene with a lesser proportion of a diene/nitrile rubbery copolymer, a composition of much improved processing, as for example ease of handling on a mill and uniformity of mixing, is obtained when the nitrile copolymer is selected as a copolymer of about 55-80 mole % of a 2-alkyl butadiene-1,3 and about 20-45 mole % of an acrylic nitrile.
    Type: Grant
    Filed: August 20, 1973
    Date of Patent: March 9, 1976
    Assignee: Polysar Limited
    Inventor: Douglas Coulthard