Patents Assigned to Kanto Chemical Co., Ltd.
  • Positive resist quaternary ammonium hydroxide containing developer with cationic and nonionic surfactant
    Patent number: 4914006
    Abstract: A positive resist developer comprising a solution containing a quaternary ammonium hydroxide, a cationic surfactant and a nonionic surfactant.
    Type: Grant
    Filed: April 4, 1988
    Date of Patent: April 3, 1990
    Assignees: Kabushiki Kaisha Toshiba, Kanto Chemical Co., Ltd.
    Inventors: Tiharu Kato, Kazuyuki Saito, Norio Ishikawa, Kiyoto Mori
  • Colorless liquid crystalline compounds
    Patent number: 4694098
    Abstract: A colorless liquid crystalline compound having at least one 6-membered ring and non-cyclic end groups in the molecular skeleton, said 6-membered ring containing two or more carbon atoms, at least one of which is directly bonded to a methylene group of a non-cyclic group having an alkoxy group at another end has a wide mesomorphic range. When said colorless liquid crystalline compound is mixed with a liquid crystal composition, the resulting mixture also has an enlarged mesomorphic range and in almost all cases has a reduced viscosity.
    Type: Grant
    Filed: August 2, 1985
    Date of Patent: September 15, 1987
    Assignees: Hitachi, Ltd., Kanto Chemical Co., Ltd.
    Inventors: Yoichi Hirai, Tsunenori Fujii, Kaoru Koto, Kenji Suzuki, Masahiro Yoshida, Hisashi Okawa, Yoshiaki Okabe, Teruo Kitamura, Hisao Yokokura, Shintaroo Hattori, Akio Mukoh, Mikio Sato