Patents by Inventor Leighton K. Derr

Leighton K. Derr 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).

  • Reaction products of DMT process residue and dipropylene glycol
    Patent number: 4346229
    Abstract: Described is a process for producing unique reaction products from DMT process residue. In the process of this invention DMT process residue is reacted with an excess of dipropylene glycol to give normally liquid, aromatic polyester polyols which are compatible with Freon 11 blowing agent and with glycerol and hence have outstanding utility in the production of blown polyurethane and polyisocyanurate-polyurethane foams.
    Type: Grant
    Filed: May 1, 1980
    Date of Patent: August 24, 1982
    Assignee: Hercules Incorporated
    Inventors: Leighton K. Derr, Lyle B. Hawkins, Marlene J. Jones