Patents by Inventor David E. Allberry

David E. Allberry 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).

  • Preparing monoalkenyl aromatic monomer-maleic half ester copolymer
    Patent number: 5237024
    Abstract: A process which comprises reacting maleic anhydride and a primary or secondary C.sub.1 -C.sub.18 alcohol to form a maleic half ester, and then polymerizing the half ester and monoalkenyl aromatic monomer in ester solvent in the presence of a catalyst to form a solution of monoalkenyl aromatic monomer-maleic half ester copolymer having a weight average molecular weight of at least 110,000 Daltons. After formation of the copolymer, the reaction solution is neutralized to form a mixture of an alkaline salt solution of the copolymer and solvent and then the solvent is removed from the mixture.
    Type: Grant
    Filed: June 11, 1992
    Date of Patent: August 17, 1993
    Assignee: Monsanto Company
    Inventors: David E. Allberry, Kang I. Lee