Patents by Inventor Kouichi Matsunaga

Kouichi Matsunaga 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: 12249625
    Abstract: A silicon carbide semiconductor device has an active region and a termination structure portion disposed outside of the active region. The silicon carbide semiconductor device includes a semiconductor substrate of a second conductivity type, a first semiconductor layer of the second conductivity type, a second semiconductor layer of a first conductivity type, first semiconductor regions of the second conductivity type, second semiconductor regions of the first conductivity type, a gate insulating film, a gate electrode, a first electrode, and a second electrode. During bipolar operation, a smaller density among an electron density and a hole density of an end of the second semiconductor layer in the termination structure portion is at most 1×1015/cm3.
    Type: Grant
    Filed: November 30, 2021
    Date of Patent: March 11, 2025
    Assignees: FUJI ELECTRIC CO., LTD., MITSUBISHI ELECTRIC CORPORATION
    Inventors: Takeshi Tawara, Tomonori Mizushima, Shinichiro Matsunaga, Kensuke Takenaka, Manabu Takei, Hidekazu Tsuchida, Kouichi Murata, Akihiro Koyama, Koji Nakayama, Mitsuru Sometani, Yoshiyuki Yonezawa, Yuji Kiuchi
  • Patent number: 6069176
    Abstract: The present invention relates to phenylethanolamine compounds represented by general formula [I]: ##STR1## (where R.sub.1 represents hydrogen or halogen; R.sub.2 represents hydrogen, hydroxy, lower alkoxy, lower alkoxy substituted with one or two lower alkoxycarbonyl or carboxy groups, lower alkoxy substituted with lower alkylaminocarbonyl which may be substituted with lower alkoxy, lower alkoxy substituted with cyclic aminocarbonyl of 4 to 6 carbon atoms, lower alkoxycarbonyl or carboxy; R.sub.3 represents hydrogen, hydroxy, lower alkoxy or lower alkoxy substituted with one or two lower alkoxycarbonyl or carboxy groups; R.sub.2 and R.sub.3 may be bonded to each other to form methylenedioxy substituted with carboxy or lower alkoxycarbonyl; and m and n are 0 or 1), and their pharmacologically acceptable salts, which have a potent .beta.3 adrenergic stimulating effect and high .beta.3 adrenergic receptor selectivity, as well as to processes for their production and intermediates in their production.
    Type: Grant
    Filed: April 24, 1998
    Date of Patent: May 30, 2000
    Assignee: Mitsubishi-Tokyo Pharmaceuticals, Inc.
    Inventors: Susumu Tsuchiya, Nobuyuki Yasuda, Toshifumi Matsumoto, Kozo Hiratsuka, Hiroyuki Iizuka, Atsusi Hukuzaki, Kouichi Matsunaga
  • Patent number: 5849801
    Abstract: 4-amino-5-oxy-2,6,6-tri methyl-2-cycloheptene compounds represented by the following general formula: ##STR1## (wherein R.sup.1 and R.sup.2 each independently represent a hydrogen atom, an alkyl group which may have a substituent, or a phenyl group which may have a hydroxyl group, lower alkoxy group, amino group, nitro group, carboxyl group, lower alkoxycarbonyl group or halogen atom, or R.sup.1, R.sup.2 and the nitrogen atom together represent a saturated nitrogen heterocyclic group; R.sup.3 represents a hydrogen atom, a lower alkyl group or a lower aliphatic acyl group); and W represents an oxo group, oxime group or oxime ether group; and their pharmacologically acceptable salts and solvates.The 4-amino-5-oxy-2,6,6-trimethyl-2-cycloheptene compounds exhibit an effect against rat peripheral arterial occlusion models, spontaneous hypertensive rats and histamine-induced airway contraction models, and are thus useful as remedy for hypertension, peripheral arterial occlusion and bronchial asthma.
    Type: Grant
    Filed: July 30, 1997
    Date of Patent: December 15, 1998
    Assignee: Tokyo Tanabe Company Limited
    Inventors: Susumu Yokura, Masao Yajima, Kiyokazu Murakami, Kouichi Matsunaga