Patents by Inventor Harold J. Harwood

Harold J. Harwood 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).

  • Process for production of copolymers of maleic anhydride and an alkyl vinyl ether in a sterically hindered monoether solvent
    Patent number: 4992517
    Abstract: What is described herein is a process for making copolymers of maleic anhydride and a C.sub.1 -C.sub.8 alkyl vinyl ether. In this process, a reactor is precharged with a solution of maleic anhydride in a sterically hindered monoether solvent and the alkyl vinyl ether monomer is fed thereto. Copolymerization is effected in the presence of a free radical initiator. A pumpable slurry of the copolymer in the reaction medium is formed upon polymerization, from which a copolymer product which is substantially a benzene-free powder is obtained.
    Type: Grant
    Filed: April 19, 1989
    Date of Patent: February 12, 1991
    Assignee: GAF Chemicals Corporation
    Inventors: Mohammed Tazi, Harold J. Harwood