Patents by Inventor Takahiro Nakazawa

Takahiro Nakazawa 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).

  • Piperidine compounds useful to treat cerebrovascular diseases
    Patent number: 5196439
    Abstract: A cyclic amine is defined by the formula: ##STR1## in which A is naphthyl, phenyl, quinolyl or alkyl, X is a group containing carbonyl, n is 2 or 3 and B is alkyl, halogen, phenyl or --YZ, Y being --O--, --CO-- or --NH--, Z being phenyl, naphthyl, pyridyl, alkyl or cycloalkyl. It is useful to treat mental symptoms associated with a cerebrovascular disease.
    Type: Grant
    Filed: January 24, 1992
    Date of Patent: March 23, 1993
    Assignee: Eisai Co., Ltd.
    Inventors: Hachiro Sugimoto, Takaharu Nakamura, Norio Karibe, Isao Saito, Kunizo Higurashi, Masahiro Yonaga, Takeru Kaneko, Takahiro Nakazawa, Masataka Ueno, Kiyomi Yamatsu, Kohshi Ueno, Masuhiro Ikeda
  • Cyclic amine derivatives
    Patent number: 4921863
    Abstract: Cyclic amine derivatives of the formula: ##STR1## or the pharmacologically acceptable salts thereof, wherein the symbols are as defined in the specification, as effective in relieving, curing or preventing mental symptoms due to cerebral vascular disorders.
    Type: Grant
    Filed: February 17, 1988
    Date of Patent: May 1, 1990
    Assignee: Eisai Co., Ltd.
    Inventors: Hachiro Sugimoto, Takaharu Nakamura, Norio Karibe, Isao Saito, Kunizou Higurashi, Masahiro Yonaga, Takeru Kaneko, Takahiro Nakazawa, Masataka Ueno, Kiyomi Yamatsu
  • Polypeptide
    Patent number: 4707468
    Abstract: A novel polypeptide is defined by the below shown formula and is useful as an analgesic. ##STR1## wherein R.sup.1 and R.sup.2 may be the same or different and each represents a hydrogen atom or a lower alkyl or lower alkenyl group, A represents a D-amino acid, Gly or Sar provided that when the D-amino acid is D-Cys, it is bonded with L-Cys or D-Cys in position 5 through a S--S bond to effect intramolecular ring closure, B represents L-Phe or D-Phe in which the benzene ring may be substituted or an .alpha.-N-alkyl derivative thereof, C represents an L-amino acid, D-Cys or an .alpha.-N-alkyl derivative thereof, D and E each represent an L- or D-basic amino acid or an .alpha.-N-alkyl derivative thereof, F represents a group of the formula --OR.sup.3 (in which R.sup.3 is H or a lower alkyl group), a group of the formula: ##STR2## (in which R.sup.4 and R.sup.5 are the same or different and each represents H or a lower alkyl group), a group of the formula: --G--OR.sup.
    Type: Grant
    Filed: November 8, 1985
    Date of Patent: November 17, 1987
    Assignee: Eisai Co., Ltd.
    Inventors: Hiroshi Yoshino, Yutaka Tsuchiya, Takeru Kaneko, Takahiro Nakazawa, Masuhiro Ikeda, Shin Araki, Kiyomi Yamatsu, Shinro Tachibana, Yoshihiro Arakawa
  • Analgesic peptide and process for the preparation thereof
    Patent number: 4551273
    Abstract: A novel peptide having the primary structure: N-Me-Tyr-Gly-Gly-Phe-Leu-Arg-Arg-D.Ile-Arg-Pro-Lys-D.Leu-Lys-Trp-NH.sub.2 (in which D.Ile and D.Leu represent a D-Ile and a D-Leu residue respectively, other abbreviations of amino acids represent each an L-amino acid residue and Me represents a methyl group), which exhibits a remarkable analgesic effect when administered peripherally. A process for the preparation thereof by a solid phase method is also disclosed.
    Type: Grant
    Filed: January 31, 1984
    Date of Patent: November 5, 1985
    Assignee: Eisai Co., Ltd.
    Inventors: Shinro Tachibana, Shizuko Ohya, Yoshihiro Arakawa, Takahiro Nakazawa, Takeru Kaneko, Masuhiro Ikeda, Kiyomi Yamatsu