Patents by Inventor Keizo Hirase

Keizo Hirase 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).

  • Pyrrole compounds
    Patent number: 8933105
    Abstract: The present invention provides a compound having a superior acid secretion inhibitory effect and showing an antiulcer activity, which is represented by the formula (I) wherein R1 is an optionally substituted cyclic group, R2 is a substituent, R3 is an optionally substituted alkyl group, an acyl group, an optionally substituted hydroxy group, an optionally substituted amino group, a halogen atom, a cyano group or a nitro group, R4 and R5 are each a hydrogen atom, an optionally substituted alkyl group, an acyl group, an optionally substituted hydroxy group, an optionally substituted amino group, a halogen atom, a cyano group or a nitro group, R6 and R6? are each a hydrogen atom or an alkyl group, and n is an integer of 0-3, or a salt thereof.
    Type: Grant
    Filed: February 26, 2008
    Date of Patent: January 13, 2015
    Assignee: Takeda Pharmaceutical Company Limited
    Inventors: Masahiro Kajino, Haruyuki Nishida, Yasuyoshi Arikawa, Keizo Hirase, Koji Ono
  • 5-Membered heterocyclic compound
    Patent number: 8334301
    Abstract: Provided is a compound having a superior acid secretion suppressive action, which shows an antiulcer activity and the like.
    Type: Grant
    Filed: September 24, 2008
    Date of Patent: December 18, 2012
    Assignee: Takeda Pharmaceutical Company Limited
    Inventors: Haruyuki Nishida, Yasuyoshi Arikawa, Keizo Hirase
  • 5-MEMBERED HETEROCYCLIC COMPOUND
    Publication number: 20100210696
    Abstract: Provided is a compound having a superior acid secretion suppressive action, which shows an antiulcer activity and the like.
    Type: Application
    Filed: September 24, 2008
    Publication date: August 19, 2010
    Applicant: TAKEDA PHARMACEUTICAL COMPANY LIMITED
    Inventors: Haruyuki Nishida, Yasuyoshi Arikawa, Keizo Hirase
  • 5-Membered heterocyclic compound
    Publication number: 20090156642
    Abstract: The present invention provides 5-membered heterocycle compounds represented by the following general formula (I): The present compounds have a superior acid secretion inhibitory effect, and shows an antiulcer activity and the like.
    Type: Application
    Filed: September 24, 2008
    Publication date: June 18, 2009
    Applicant: Takeda Pharmaceutical Company Limited
    Inventors: Haruyuki Nishida, Yasuyoshi Arikawa, Keizo Hirase
  • Pyrrole compounds
    Publication number: 20080262042
    Abstract: The present invention provides a compound having a superior acid secretion inhibitory effect and showing an antiulcer activity, which is represented by the formula (I) wherein R1 is an optionally substituted cyclic group, R2 is a substituent, R3 is an optionally substituted alkyl group, an acyl group, an optionally substituted hydroxy group, an optionally substituted amino group, a halogen atom, a cyano group or a nitro group, R4 and R5 are each a hydrogen atom, an optionally substituted alkyl group, an acyl group, an optionally substituted hydroxy group, an optionally substituted amino group, a halogen atom, a cyano group or a nitro group, R6 and R6? are each a hydrogen atom or an alkyl group, and n is an integer of 0-3, or a salt thereof.
    Type: Application
    Filed: February 26, 2008
    Publication date: October 23, 2008
    Applicant: Takeda Pharmaceutical Company Limited
    Inventors: Masahiro Kajino, Haruyuki Nishida, Yasuyoshi Arikawa, Keizo Hirase, Koji Ono