Patents by Inventor Takuji Ishikawa

Takuji Ishikawa 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).

  • Novel fluorine-containing polymer, resist composition prepared from same and novel fluorine-containing monomer
    Publication number: 20040191680
    Abstract: There is provided a fluorine-containing copolymer having an aliphatic monocyclic structure in the polymer trunk chain which has a number average molecular weight of from 500 to 1,000,000 and is represented by the formula (Ma):
    Type: Application
    Filed: April 2, 2004
    Publication date: September 30, 2004
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Takayuki Araki, Takuji Ishikawa, Meiten Koh
  • Novel fluorine-containing polymer having acid-reactive group and chemically amplifying type photoresist composition prepared from same
    Publication number: 20030152864
    Abstract: There is provided a novel fluorine-containing polymer having an acid-reactive group which has a high transparency against energy rays (radioactive rays) in a vacuum ultraviolet region (157 nm), and further there are provided a material for fluorine-containing base polymer prepared from the polymer and suitable for a photoresist and a chemically amplifying type resist composition obtained therefrom.
    Type: Application
    Filed: October 3, 2002
    Publication date: August 14, 2003
    Applicant: Daikin Industries, Ltd.
    Inventors: Takayuki Araki, Meiten Koh, Yoshito Tanaka, Takuji Ishikawa, Hirokazu Aoyama, Tetsuo Shimizu
  • Process for producing fluoroionomer, method for purification and concentration of the ionomer, and method of film formation
    Publication number: 20030023015
    Abstract: The present invention provides a process for producing a fluorinated ionomer, comprising copolymerizing, in the presence of a polymerization initiator, (i) a compound represented by Formula (I) (M)1/LOSO2CFY(CF2)mO(CFXCF2O)nCF═CF2  (I)
    Type: Application
    Filed: August 14, 2002
    Publication date: January 30, 2003
    Inventors: Masayoshi Tatemoto, Tadashi Ino, Kenji Ishii, Takuji Ishikawa, Takuya Arase
  • Radiotelephone system adapted to read a credit card
    Patent number: 4845740
    Abstract: A radio phone equipment for credit card is adapted to transfer part or a whole of credit card or charge card information read by a card reader as well as a dial number dialed by a key pad to a mobile telecommunication switching office by means of a modem and a transmitter/receiver, and in case of said credit card or charge card being valid, switching, on the basis of a designation on a voice channel transmitted from said mobile telecommunication switching office, or transmitting and receiving frequency to said voice channel to construct a speech channel, and furthermore detecting on-hook of a handset produced upon finishing talking to reset the equipment.
    Type: Grant
    Filed: December 5, 1988
    Date of Patent: July 4, 1989
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Katsumi Tokuyama, Kanji Arai, Takuji Ishikawa, Haruhiko Akiyama