Patents by Inventor Adrian R. Armstrong

Adrian R. Armstrong 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).

  • Chlorinated terpolymers of ethylene
    Patent number: 4972026
    Abstract: A chlorinated terpolymer of a precursor terpolymer containing 3-20 weight percent acrylic acid or methacrylic acid, 3-20 weight percent vinyl acetate and 60-90 weight percent ethylene contains 20-60 weight percent chlorine and has a Brookfield viscosity of about 150-600 cP when measured at 25.degree. C. in xylene solution at a concentration of 25% by weight chlorinated terolymer. The chlorinated terpolymer contains 20-60 and preferably 25-55 weight percent chlorine.
    Type: Grant
    Filed: November 25, 1988
    Date of Patent: November 20, 1990
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Adrian R. Armstrong, James W. Dawes