Patents by Inventor Maki Tokai

Maki Tokai 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: 7410987
    Abstract: A method of treating pain or pruritis comprising administering to a patient in need thereof a pharmaceutically effective amount of a ? opioid receptor agonist of the formula wherein R is an alkyl having an amino group as a substituent; and R1 is acyl.
    Type: Grant
    Filed: May 15, 2006
    Date of Patent: August 12, 2008
    Assignee: Santen Pharmaceutical Co., Ltd.
    Inventors: Maki Tokai, Takahiro Honda, Masashi Niwa, Yaeko Osumi, Ken-ichi Fujimura, Shin-ichi Kohno
  • Patent number: 7112598
    Abstract: A compound or a salt thereof having the following formula wherein R1 is acyl, R2 is hydrogen, halogen, unsubstituted alkyl or alkyl substituted by halogen; R3 is halogen or alkoxy; R4 is cycloalkyl, unsubstituted alkyl or alkyl substituted by cycloalkyl, aryl or hydroxyl or an ester thereof or alkoxy; R5 is hydroxyl or an ester thereof, alkoxy or alkoxyalkyl; or R4 and R5 are bonded with each other to form a pyrrolidine ring substituted by hydroxyl or an ester thereof, alkoxy or alkoxyalkyl; R6 is hydroxyl or an ester thereof, alkoxy, alkoxyalkoxy, alkoxyalkoxyalkoxy, mercapto or alkylthio; and A1 and A2, are the same or different, and are alkylene, provided that (i) when R4 and R5 are bonded to each other to form the pyrrolidine ring substituted by hydroxyl or an ester thereof, R2 is halogen; (ii) when R4 and R5 are bonded to each other to form the pyrrolidine ring substituted by alkoxyalkyl, R2 is hydrogen; (iii) when R6 is hydroxyl or an ester thereof, R4 is isopropyl.
    Type: Grant
    Filed: March 28, 2003
    Date of Patent: September 26, 2006
    Assignee: Santen Pharmaceutical Co., Ltd.
    Inventors: Maki Tokai, Takahiro Honda, Masashi Niwa, Yaeko Osumi, Ken-ichi Fujimura, Shin-ichi Kohno
  • Publication number: 20060205796
    Abstract: A method of treating pain or pruritis comprising administering to a patient in need thereof a pharmaceutically effective amount of a ? opioid receptor agonist of the formula wherein R is an alkyl having an amino group as a substituent; and R1 is acyl.
    Type: Application
    Filed: May 15, 2006
    Publication date: September 14, 2006
    Applicant: SANTEN PHARMACEUTICAL CO., LTD.
    Inventors: Maki Tokai, Takahiro Honda, Masashi Niwa, Yaeko Osumi, Ken-ichi Fujimura, Shin-ichi kohno
  • Publication number: 20050113430
    Abstract: The present invention provides ? opioid receptor agonists comprising 2-phenylbenzothiazoline derivatives. The present invention relates to ? opioid receptor agonists comprising compounds or salts thereof having the chemical structure represented by the general formula [I]. Namely, it is important for exhibition of the ? opioid receptor agonist actions to have an alkyl group having an amino group at a phenyl group of 2-phenylbenzothiazoline as a substituent and to have an acyl group at a nitrogen atom of 2-phenylbenzothiazoline, wherein R is alkyl having the amino group as the substituent; and R1 is acyl.
    Type: Application
    Filed: March 28, 2003
    Publication date: May 26, 2005
    Applicant: Santen Pharmaceutical Co., LTD
    Inventors: Maki Tokai, Takahiro Honda, Yaeko Osumi, Ken-ichi Fujimura