Patents by Inventor Jitsuo Kurokawa

Jitsuo Kurokawa 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).

  • Process for gas phase polymerization
    Patent number: 5446116
    Abstract: A fluidized bed-type polymerization apparatus has an upper blowing equipment installed at a definite height in the fluidized bed area. Through the equipment, a part of the circulating gas and a part, or the whole, of the fresh feed material is blown, thereby to prevent the formation of lumps of polymer in the fluidized bed portion, owing to improved intermixing at the upper portion of the fluidized bed, as well as efficient heat-removal at that portion.
    Type: Grant
    Filed: August 10, 1993
    Date of Patent: August 29, 1995
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Hiroyuki Ogawa, Hideo Kusakabe, Ikuhiro Tamaru, Yoshizumi Sasaki, Jitsuo Kurokawa
  • Liquid crystalline compounds having substituents
    Patent number: 4943386
    Abstract: A liquid crystalline compound represented by formula ##STR1## wherein R denotes an alkyl or alkoxy group having 1 to 20 carbon atoms,m and n are each 0 or 1, provided m and n are not 1 at the same time. ##STR2## X and Y each denote a hydrogen atom, a halogen atom or a nitro group, provided X and Y are not hydrogen atoms at the same time, andQ* denotes an optically active group having an asymmetric carbon atom and a linear or cyclic alkyl or alkenyl group which may be substituted by a halogen atom, or the like.
    Type: Grant
    Filed: October 4, 1988
    Date of Patent: July 24, 1990
    Assignees: Dainippon Ink & Chemicals, Inc., Kawamura Institute of Chemical Research
    Inventors: Sadao Takehara, Toru Fujisawa, Yoshi Arai, Jitsuo Kurokawa
  • Optically active carboxylic acid derivatives and liquid crystalline compositions comprising them
    Patent number: 4914224
    Abstract: An optically active carboxylic acid derivative represented by the general formula ##STR1## wherein R represents a normal alkyl group having 1 to 20 carbon atoms, m and n represent 0 or 1 but are not 1 at the same time, X represents a hydrogen or halogen atom, Y represents a hydrogen or fluorine atom, provided that when Y is a hydrogen atom, X is a halogen atom, and that when n is 0, Y is ahydrogen atom, and Q* represents an optically active alkyl or 1-alkoxyethyl group having an asymmetric carbon atom.
    Type: Grant
    Filed: January 28, 1987
    Date of Patent: April 3, 1990
    Assignees: Dainippon Ink and Chemicals, Inc., Kawamura Institute of Chemical Research
    Inventors: Tadao Shoji, Sadao Takehara, Toru Fujisawa, Masashi Osawa, Hiroshi Ogawa, Yoshi Arai, Jitsuo Kurokawa
  • Optically active carboxylic acid derivatives and liquid crystalline compositions comprising them
    Patent number: 4911862
    Abstract: An optically active carboxylic acid derivative represented by the general formula ##STR1## wherein R represents a normal alkyl group having 1 to 20 carbon atoms, m and n represent 0 or 1 but are not 1 at the same time, X represents a hydrogen or halogen atom, Y represents a hydrogen or fluorine atom, provided that when Y is a hydrogen atom, X is a halogen atom, and that when n is 0, Y is a hydrogen atom, and Q* represents an optically active alkyl or 1-alkoxyethyl group having an asymmetric carbon atom.
    Type: Grant
    Filed: June 23, 1988
    Date of Patent: March 27, 1990
    Assignees: Dainippon Ink and Chemicals, Inc., Kawamura Institute of Chemical Research
    Inventors: Tadao Shoji, Sadao Takehara, Toru Fujisawa, Masashi Osawa, Hiroshi Ogawa, Yoshi Arai, Jitsuo Kurokawa
  • Novel liquid crystalline compounds having substituents
    Patent number: 4828754
    Abstract: A liquid crystalline compound represented by formula ##STR1## wherein R denotes an alkyl or alkoxy group having 1 to 20 carbon atoms,m and n are each 0 or 1, provided m and n are not 1 at the same time. ##STR2## X and Y each denote a hydrogen atom, a halogen atom or a nitro group, provided X and Y are not hydrogen atoms at the same time, and Q* denotes an optically active group having an asymmetric carbon atom and a linear or cyclic alkyl or alkenyl group which may be substituted by a halogen atom, or the like.
    Type: Grant
    Filed: February 23, 1988
    Date of Patent: May 9, 1989
    Assignees: Dainippon Ink & Chemicals, Inc., Kawamura Institute of Chemical Res.
    Inventors: Sadao Takehara, Toru Fujisawa, Yoshi Arai, Jitsuo Kurokawa