Patents by Inventor Robert E. Hefner, Sr.

Robert E. Hefner, Sr. 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).

  • Polyoxazoline modified unsaturated polyesteramides
    Patent number: 4485220
    Abstract: A modified unsaturated polyester (polyesteramide) is the reaction product of a diacid or anhydride (such as maleic anhydride), a polyahl (such as an aliphatic glycol), and an effective amount of a poly[(alkionylimino)alkylene] (such as poly[(propionylimino)ethylene], otherwise known as poly(2-ethyl-2-oxazoline)) wherein at least one of the diacid or anhydride, and the polyahl, have addition polymerizable unsaturation. The modified polyesters of the invention have improved physical properties compared to similar polyesters prepared without the poly[(alkionylimino)alkylene].
    Type: Grant
    Filed: December 23, 1982
    Date of Patent: November 27, 1984
    Assignee: The Dow Chemical Company
    Inventors: Robert E. Hefner, Jr., Robert E. Hefner, Sr.