Patents by Inventor Akihiro Tasaka

Akihiro Tasaka 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).

  • Patent number: 5792780
    Abstract: The present invention provides an azole compound represented by the formula (I): ##STR1## , wherein Ar is an optionally-substituted phenyl group; R.sup.1 and R.sup.2 are, the same or different, a hydrogen atom or a lower alkyl group, or R.sup.1 and R.sup.2 may combine together to form a lower alkylene group; R.sup.3 is a hydrogen atom or an acyl group; Y is a nitrogen atom or a methine group; and A is an optionally-substituted saturated cyclic amide group bonded through a first nitrogen atom, or a salt thereof, which is useful for prevention and therapy of fungal infections of mammals as antifungal agent.
    Type: Grant
    Filed: May 1, 1996
    Date of Patent: August 11, 1998
    Assignee: Takeda Chemical Industries, Ltd.
    Inventors: Katsumi Itoh, Kenji Okonogi, Akihiro Tasaka
  • Patent number: 5677464
    Abstract: A compound of the formula (V): ##STR1## wherein Ar' is a halogenated phenyl group, R is a hydrocarbon residue having a functional group at the .alpha.-carbon, R.sup.3' is an optionally substituted aliphatic or aromatic hydrocarbon residue or an optionally substituted aromatic heterocyclic group, Y and Z are, the same or different, a nitrogen atom or a methine group optionally substituted with a lower alkyl group, and (R) and (S) represent configurations, which is an optically active intermediate for production of optically active triazole compounds (I): ##STR2## wherein the symbols have the same meanings as defined above, and methods of preparing the compounds (V) and (I).
    Type: Grant
    Filed: May 30, 1995
    Date of Patent: October 14, 1997
    Assignee: Takeda Chemical Industries, Ltd.
    Inventors: Katsumi Itoh, Akihiro Tasaka, Hiroshi Hosono
  • Patent number: 5545652
    Abstract: The present invention provides an azole compound represented by the formula (I): ##STR1## wherein Ar is an optionally-substituted phenyl group; R.sup.1 and R.sup.2 are, the same or different, a hydrogen atom or a lower alkyl group, or R.sup.1 and R.sup.2 may combine together to form a lower alkylene group; R.sup.3 is a hydrogen atom or an acyl group; Y is a nitrogen atom or a methine group; and A is an optionally-substituted saturated cyclic amide group bonded through a first nitrogen atom, or a salt thereof, which is useful for prevention and therapy of fungal infections of mammals as antifungal agent.
    Type: Grant
    Filed: September 23, 1994
    Date of Patent: August 13, 1996
    Assignee: Takeda Chemical Industries, Ltd.
    Inventors: Katsumi Itoh, Kenji Okonogi, Akihiro Tasaka
  • Patent number: 5389663
    Abstract: An azole compound represented by the formula (I): ##STR1## wherein X is a nitrogen atom; Ar is a phenyl group substituted by halogen or a halogenated C.sub.1-4 alkyl group; R.sup.1 and R.sup.2 independently are a hydrogen atom or a lower alkyl group, or R.sup.1 and R.sup.2 may combine together to form a lower alkylene group; n denotes an integer of 0 to 2; and R.sup.7 is a hydrogen atom, a hydroxyl group which may be optionally acylated by an acyl group selected from acetyl, propionyl, butyryl, isobutyryl, phenylacetyl and benzoyl, or may form a bond together with R.sup.1 ; or a salt thereof.
    Type: Grant
    Filed: November 24, 1993
    Date of Patent: February 14, 1995
    Assignee: Takeda Chemical Industries, Ltd.
    Inventors: Katsumi Itoh, Kenji Okonogi, Akihiro Tasaka
  • Patent number: 5008454
    Abstract: Novel compounds having the formula:R.sup.1 --OCH.sub.2 CH.sub.2 CH.sub.2 O--(CH.sub.2).sub.n --R.sup.2wherein R.sup.1 stands for a higher alkyl group; R.sup.2 stands for a primary to tertiary amino group or a quaternary ammonium group; and n denotes an integer of 3 to 10; and salts thereof, have excellent anti-tumor action and therefore are useful as anti-tumor agents.
    Type: Grant
    Filed: March 12, 1990
    Date of Patent: April 16, 1991
    Assignee: Takeda Chemical Industries, Ltd.
    Inventors: Keizo Inoue, Hiroaki Nomura, Akihiro Tasaka