Patents by Inventor Nami Ohgaya

Nami Ohgaya 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 producing an unsymmetrical diester of .alpha., .beta.-unsaturated dicarboxylic acid
    Patent number: 5523465
    Abstract: A process for producing a colorless unsymmetrical-diester of maleic acid, useful as a raw material of an emulsifier for emulsion polymerization and as a modifier for a polymer, which comprises:(1) reacting maleic anhydride with a monohydric alcohol in the presence of an inert organic solvent, in a molar ratio of 1:(1.0-1.2) to obtain maleic acid mono ester containing substantially no unreacted maleic anhydride, and(2) reacting said monoester with an alkenyl halide in the presence of a tertiary amine and water, in a molar ratio of said monoester:water of 1:(0.01-0.20).
    Type: Grant
    Filed: March 28, 1995
    Date of Patent: June 4, 1996
    Assignee: Sanyo Chemical Industries, Ltd.
    Inventors: Yoshimi Inden, Tadashi Yamauchi, Seiji Yamashita, Nami Ohgaya