Patents by Inventor Kazuhiro Oonishi

Kazuhiro Oonishi 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).

  • Publication number: 20110227187
    Abstract: The present invention provides a Schottky barrier semiconductor device having a semiconductor substrate 101, a low-concentration semiconductor layer 102, trenches 103 formed in the low-concentration semiconductor layer 102 and extending to the semiconductor substrate 101, and a mesa portion 102a formed between the trenches 103. This provides a high durability against a surge or transient voltage.
    Type: Application
    Filed: May 24, 2011
    Publication date: September 22, 2011
    Applicant: Panasonic Corporation
    Inventor: Kazuhiro Oonishi
  • Patent number: 8018020
    Abstract: The invention provides a Schottky barrier diode in which a forward voltage is low, a backward leakage current is small, and a withstanding voltage of an element is high, by improving both the forward voltage VF and the backward leakage current IR. A Schottky barrier diode of the invention includes a semiconductor substrate whose surface is provided with a semiconductor layer of first conduction type, a plurality of semiconductor layers of second conduction type provided as junction barriers at a predetermined depth from the surface of the semiconductor layer of first conduction type, an annular shape guard ring comprised of a semiconductor layer of second conduction type to surround the semiconductor layer of second conduction type on the surface of the semiconductor layer of first conduction type, and a metal layer disposed so as to contact the semiconductor layer of first conduction type and the semiconductor layer of second conduction type.
    Type: Grant
    Filed: August 29, 2008
    Date of Patent: September 13, 2011
    Assignee: Panasonic Corporation
    Inventor: Kazuhiro Oonishi
  • Publication number: 20090057807
    Abstract: The invention provides a Schottky barrier diode in which a forward voltage is low, a backward leakage current is small, and a withstanding voltage of an element is high, by improving both the forward voltage VF and the backward leakage current IR. A Schottky barrier diode of the invention includes a semiconductor substrate whose surface is provided with a semiconductor layer of first conduction type, a plurality of semiconductor layers of second conduction type provided as junction barriers at a predetermined depth from the surface of the semiconductor layer of first conduction type, an annular shape guard ring comprised of a semiconductor layer of second conduction type to surround the semiconductor layer of second conduction type on the surface of the semiconductor layer of first conduction type, and a metal layer disposed so as to contact the semiconductor layer of first conduction type and the semiconductor layer of second conduction type.
    Type: Application
    Filed: August 29, 2008
    Publication date: March 5, 2009
    Inventor: Kazuhiro Oonishi
  • Publication number: 20080083966
    Abstract: The present invention provides a Schottky barrier semiconductor device having a semiconductor substrate 101, a low-concentration semiconductor layer 102, trenches 103 formed in the low-concentration semiconductor layer 102 and extending to the semiconductor substrate 101, and a mesa portion 102a formed between the trenches 103. This provides a high durability against a surge or transient voltage.
    Type: Application
    Filed: July 23, 2007
    Publication date: April 10, 2008
    Applicant: Matsushita Electric Industrial Co., Ltd.
    Inventor: Kazuhiro Oonishi
  • Patent number: 6479689
    Abstract: A method for continuously producing a dialkyl carbonate and a diol, comprising: (1) continuously feeding a cyclic carbonate and an aliphatic monohydric alcohol to a continuous multi-stage distillation column, and continuously effecting a transesterification between the cyclic carbonate and the aliphatic monohydric alcohol in the presence of a transesterification catalyst in the distillation column, while continuously withdrawing a low boiling point mixture in a gaseous form containing the produced dialkyl carbonate and the unreacted aliphatic monohydric alcohol from an upper portion of the distillation column and continuously withdrawing a high boiling point mixture in a liquid form containing the produced diol and the unreacted cyclic carbonate from a lower portion of the distillation column, and (2) continuously feeding the high boiling point mixture withdrawn from the lower portion of the distillation column to a continuous etherification reactor, to thereby effect a continuous etherification reaction betw
    Type: Grant
    Filed: June 11, 2001
    Date of Patent: November 12, 2002
    Assignee: Asahi Kasei Kabushiki Kaisha
    Inventors: Masahiro Tojo, Kazuhiro Oonishi
  • Patent number: 6346638
    Abstract: A method for continuously producing a (A) dialkyl carbonate and a (B) diol, comprising continuously feeding a cyclic carbonate and an aliphatic monohydric alcohol to a continuous multi-stage distillation column to thereby effect a transesterification therebetween, thereby continuously producing a dialkyl carbonate and a diol, while continuously withdrawing a low boiling point mixture containing the produced dialkyl carbonate (A) in a gaseous form from an upper portion of the distillation column and continuously withdrawing a high boiling point mixture containing the produced diol (B) in a liquid form from a lower portion of the distillation column, wherein the transesterification is performed under conditions wherein: (a) the reaction pressure of the column bottom is 5×104 Pa or less; (b) the reaction temperature of the column bottom is in the range of from −20° C. to less than 60° C.; and (c) the distillation column has an F-factor in the range of from 0.2 to 5.
    Type: Grant
    Filed: November 6, 2000
    Date of Patent: February 12, 2002
    Assignee: Asahi Kasel Kabushiki Kaisha
    Inventors: Masahiro Tojo, Kazuhiro Oonishi
  • Patent number: 6262210
    Abstract: A process for producing aromatic carbonates, which comprises transesterifying, in the presence of a metal-containing catalyst, a starting material selected from a dialkyl carbonate, an alkyl aryl carbonate and a mixture thereof with a reactant selected from an aromatic monohydroxy compound, an alkyl aryl carbonate and a mixture thereof, characterized in that: at least one type of catalyst-containing liquid is taken out, wherein the catalyst-containing liquid is selected from a portion of a high boiling point reaction mixture obtained by the above transesterification and containing the desired aromatic carbonate and the metal-containing catalyst, and a portion of a liquid catalyst fraction obtained by separating the desired aromatic carbonate from the high boiling point reaction mixture, wherein each portion contains (A) high boiling point substance having a boiling point higher than the boiling point of the produced aromatic carbonate and (B) the metal-containing catalyst; (C) a functional substance capable o
    Type: Grant
    Filed: December 15, 1999
    Date of Patent: July 17, 2001
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Masahiro Tojo, Kazuhiro Oonishi, Kyosuke Komiya