Patents by Inventor Minehiko Yamamura

Minehiko Yamamura 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 preparing a naphthalene derivative
    Patent number: 5066825
    Abstract: A novel process for preparing a naphthalene derivative of the formula: ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6 and R.sup.7 are a lower alkyl group, and an intermediate thereof is disclosed. Said naphthalene derivative (I) and a pharmaceutically acceptable salt thereof are useful as a hypolipidemic agent.
    Type: Grant
    Filed: November 16, 1989
    Date of Patent: November 19, 1991
    Assignee: Tanabe Seiyaku Co., Ltd.
    Inventors: Takashi Suzuki, Minehiko Yamamura, Shinichi Yamada
  • Purification of penicillin derivative
    Patent number: 4313875
    Abstract: Crude 6-[D-2-(D-2-amino-3-N-methylcarbamoyl-propionamido)-2-p-hydroxyphenylaceta mido]penicillanic acid can be purified by the steps of:(A) contacting an aqueous solution of 6-[D-2-(D-2-amino-3-N-methylcarbamoyl-propionamido)-2-p-hydroxyphenylaceta mido]-penicillanic acid with a nonpolar, macroporous styrenedivinylbenzyl copolymer adsorption resin to adsorb 6-[D-2-(D-2-amino-3-N-methylcarbamoyl-propionamido)-2-p-hydroxyphenylaceta mido]penicillanic acid on the resin,(B) eluting the adsorbed 6-[D-2-(D-2-amino-3-N-methylcarbamoyl-propionamido)-2-p-hydroxyphenylaceta mido]penicillanic acid with water or a mixture of water and a water-miscible organic solvent,and then(C) isolating pure 6-[D-2-(D-2-amino-3-N-methylcarbamoyl-propionamido)-2-p-hydroxyphenylaceta mido]penicillanic acid from the eluates.
    Type: Grant
    Filed: August 27, 1980
    Date of Patent: February 2, 1982
    Assignee: Tanabe Seiyaku Co., Ltd.
    Inventors: Etsumi Nakamura, Takashi Suzuki, Tadasu Yanagida, Minehiko Yamamura