Patents by Inventor Masatsune Okuma

Masatsune Okuma 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).

  • Calcium carbonate scale inhibitor having organophosphonate, water soluble acrylic or maleic copolymer and citric acid
    Patent number: 5259985
    Abstract: A scale inhibitor for a calcium-type scale, which includes ingredients of:(a) an organophosphonic acid or its salt having an scale inhibiting activity;(b) a water-soluble acrylic acid-type or maleic acid-type polymer constituted by at least two kinds of monomer unit composed of a vinyl monomer having a carboxyl group or another polar group; and(c) citric acid or its salt.
    Type: Grant
    Filed: August 26, 1991
    Date of Patent: November 9, 1993
    Assignee: Katayama Chemical, Incorporated
    Inventors: Keisho Nakanishi, Masatsune Okuma, Sakae Katayama, deceased
  • Scale inhibitor
    Patent number: 4814406
    Abstract: A scale inhibitor containing as its active component a copolymer comprising acrylic acid, methacrylic acid and a C.sub.1-8 alkyl ester of (meth)acrylic acid, the copolymer being(a) about 1:4 to about 4:1 in the copolymerization mole ratio of acrylic acid to methacrylic acid,(b) about 2:1 to about 40:1 in the copolymerization mole ratio of a total amount of acrylic acid and methacrylic acid to the C.sub.1-8 alkyl ester of (meth) acrylic acid, and(c) about 500 to about 15,000 in average molecular weight.
    Type: Grant
    Filed: February 18, 1987
    Date of Patent: March 21, 1989
    Assignee: Katayama Chemical Works Ltd.
    Inventors: Sakae Katayama, Tadahiko Asano, Masatsune Okuma, Keisyo Nakanishi