Patents by Inventor Tadashi Narita

Tadashi Narita 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).

  • Method for anionic homopolymerization of .alpha.-trifluoromethylacrylate
    Patent number: 4613657
    Abstract: A methanol-insoluble homopolymer of an .alpha.-trifluoromethylacrylate, which has either an alkyl group or a fluorine-containing alkyl group in the ester radical, is formed at good yields in an organic aprotic solvent by using an alkali metal alkoxide, e.g. lithium t-butoxide, as anionic polymerization catalyst.
    Type: Grant
    Filed: February 6, 1986
    Date of Patent: September 23, 1986
    Assignee: Central Glass Company, Limited
    Inventors: Tadashi Narita, Tokio Hagiwara, Hiroshi Hamana
  • Novel Fredericamycin A derivatives
    Patent number: 4584377
    Abstract: Disclosed herein are Fredericamycin A derivatives, each, represented by the following general formula (I): ##STR1## wherein R means a hydrogen atom or acyl group, A denotes ##STR2## and dotted bonds are optional, with a proviso that when A is ##STR3## or the dotted bonds are contained, R is other than hydrogen atom. They have excellent antibacterial and antitumor activities and at the same time, are extremely stable compared with Fredericamycin A.
    Type: Grant
    Filed: August 9, 1984
    Date of Patent: April 22, 1986
    Assignee: SS Pharmaceutical Co., Ltd.
    Inventors: Koichi Yokoi, Hiroshi Hasegawa, Tadashi Narita, Takemitsu Asaoka, Kenichi Kukita, Seiji Ishizeki, Toshiaki Nakashima