Patents by Inventor Ryo Yamanishi

Ryo Yamanishi 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).

  • Polyenepolycarboxylic acids, derivatives thereof with respect to carboxyl groups, or salts of these
    Patent number: 6372943
    Abstract: Polyenepolycarboxylic acids represented by the following formula (1); (wherein n represents an integer of 0 to 5 and m represents an integer of 1 or 2, provided m is 1 when n is 0), or derivatives thereof at their carboxyl group(s) or their salts. The above compounds originate from natural products and are capable of exhibiting excellent dispersing ability.
    Type: Grant
    Filed: October 30, 2000
    Date of Patent: April 16, 2002
    Assignee: Fujisawa Pharmaceutical Co., Ltd.
    Inventors: Shinobu Kasuga, Toshihito Kakiuchi, Ryo Yamanishi, Kazuki Okada
  • Crystal of depsipeptide derivative and process for producing the same
    Patent number: 6346603
    Abstract: Crystals of a depsipeptide derivative of formula (IV): having an antiparasitic activity and methods for producing such crystals. Such crystals include crystals (I), (II) and (III) that have particular physicochemical properties or characteristics, such as excellent filtration properties during crystallization, great fluidity, good specific volume. As a consequence, such crystals have improved handling ability during production resulting in enhanced production efficiency and increased crystal yield. Methods are also provided for producing such crystals.
    Type: Grant
    Filed: May 8, 2000
    Date of Patent: February 12, 2002
    Assignee: Fujisawa Pharmaceutical Co., Ltd.
    Inventors: Atsushi Yamamura, Ryo Yamanishi, Muneharu Ikushima
  • Process for producing depsipeptide derivatives and novel intermediates therefor
    Patent number: 6235875
    Abstract: An industrially excellent alternative process for producing cyclodepsipeptide derivatives, as represented in formula (1), having an excellent vermicidal activity as an animal and human anthelmintic, wherein R1 represents hydrogen or a hydroxyl-protective group; R2 represents a carboxyl group optionally protected; R3, R4, R7 and R8 represent each a lower alkyl, aryl or (un)substituted aralkyl; and R5, R6, R9 and R10 represent each a lower alkyl.
    Type: Grant
    Filed: April 6, 1999
    Date of Patent: May 22, 2001
    Assignee: Fujisawa Pharmaceutical Co., Ltd.
    Inventors: Ryo Yamanishi, Masaru Ohgaki
  • Depsipeptide derivative, process for production thereof, and novel intermediate therefor
    Patent number: 5856436
    Abstract: A novel industrial process for producing an anthelmintic depsipeptide derivative represented by structural formula (I), which is excellent in the yield etc.
    Type: Grant
    Filed: December 29, 1997
    Date of Patent: January 5, 1999
    Assignee: Fujisawa Pharmaceutical Co., Ltd.
    Inventors: Hitoshi Nishiyama, Masaru Ohgaki, Ryo Yamanishi
  • Cyclodepsipeptide compound
    Patent number: 5646244
    Abstract: A compound of the formula: ##STR1## wherein A is benzyl group which has suitable substituent (s), A.sup.a, B and D are each lower alkyl,C is hydrogen or lower alkyl,or a salt thereof.The compound or its salt of the present invention has excellent parasiticidal activities as parasiticides (anthelmintics) for animals and human bodies.
    Type: Grant
    Filed: March 6, 1996
    Date of Patent: July 8, 1997
    Assignee: Fujisawa Pharmaceutical Co., Ltd.
    Inventors: Hitoshi Nishiyama, Masaru Ohgaki, Ryo Yamanishi, Toshihiko Hara
  • Depsipeptide derivatives, production thereof and use thereof
    Patent number: 5514773
    Abstract: wherein A is benzyl group which has suitable substituent(s) or phenyl group which may have suitable substituent(s),A.sup.a is benzyl group which may have suitable substituent(s) or phenyl group which may have suitable substituent(s),B and D are each lower alkyl,C is hydrogen or lower alkyl,and a pharmaceutically acceptable salt thereof. The compound or a salt thereof of the present invention has excellent parasiticidal activities as an anthelmintic agent for animals and human bodies.
    Type: Grant
    Filed: September 12, 1994
    Date of Patent: May 7, 1996
    Assignee: Fujisawa Pharmaceutical Co., Ltd.
    Inventors: Hitoshi Nishiyama, Masaru Ohgaki, Ryo Yamanishi, Toshihiko Hara