Patents by Inventor Yasumichi Yamakoshi

Yasumichi Yamakoshi 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).

  • Electrolysis of aqueous alkali metal halide solution
    Patent number: 4209367
    Abstract: An electrolytic cell having anode and cathode chambers separated by a cation exchange membrane comprising a fluorocarbon polymer containing pendant carboxylic acid or salt groups of the formula ##STR1## wherein R is a group containing perfluoroalkyl or perfluoroalkoxy having 1 to 5 carbon atoms and M is hydrogen, an alkali or alkaline earth metal or ammonium as a surface stratum on the cathode side of the membrane.
    Type: Grant
    Filed: March 30, 1977
    Date of Patent: June 24, 1980
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Maomi Seko, Yasumichi Yamakoshi, Hirotsugu Miyauchi, Kyoji Kimoto, Toshioki Hane, Mitsunobu Fukumoto, Itaru Watanabe, Sakae Tsushima
  • Cation exchange membrane preparation and use thereof
    Patent number: 4151053
    Abstract: Cation exchange membrane comprising a fluorocarbon polymer characterized by the presence of pendant carboxylic acid groups of the formula -- OCF.sub.2 COOH -- and derivatives thereof.
    Type: Grant
    Filed: March 17, 1978
    Date of Patent: April 24, 1979
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Naomi Seko, Yasumichi Yamakoshi, Hirotsugu Miyauchi, Mitsunobu Fukumoto, Kyoji Kimoto, Itaru Watanabe, Toshioki Hane, Sakae Tsushima
  • Method for preparation of cation exchange membranes
    Patent number: 4126589
    Abstract: A fluorocarbon polymer membrane having pendant sulfonamide groups is first treated with anion radicals and then hydrolyzed for conversion into a cation exchange membrane having carboxylic groups and sulfonic acid groups.
    Type: Grant
    Filed: November 14, 1977
    Date of Patent: November 21, 1978
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Masato Hamada, Maomi Seko, Yasumichi Yamakoshi, Hirotsugu Miyauchi, Fumihiko Yamamoto
  • Process for electrolysis of aqueous alkali metal halide solution
    Patent number: 4123336
    Abstract: An aqueous alkali metal halide solution is electrolyzed in an electrolytic cell using a cation exchange membrane which is a fluorocarbon polymer containing sulfonic acid groups and at least one cation exchange group which is less acidic than the sulfonic acid group with higher proportion of the latter in surface stratum on the cathode side of the membrane than in the entire membrane, while controling proton concentration in the anolyte at not higher than critical proton concentration at which no substantial amount of protons in the anolyte penetrate into the membrane.This invention relates to a process for electrolysis of an aqueous alkali metal halide solution using a cation exchange membrane comprising a fluorocarbon polymer containing sulfonic acid groups and at least one cation exchange group with weaker acidity than the sulfonic acid group.
    Type: Grant
    Filed: March 25, 1977
    Date of Patent: October 31, 1978
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Maomi Seko, Yasumichi Yamakoshi, Hirotsugu Miyauchi, Kyoji Kimoto, Yoshinori Masuda
  • Process for production of perfluorocarbon type cation exchange membrane
    Patent number: 4093568
    Abstract: A perfluorocarbon type cation exchange membrane prepared by treatment with an oxidizing agent of a cation exchange membrane containing perfluorocarbon polymers having specific pendant N-sulfonamide groups has improved electrochemical characteristics when used as a membrane in electrolysis of aqueous alkali halide solution.
    Type: Grant
    Filed: November 2, 1976
    Date of Patent: June 6, 1978
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Maomi Seko, Yasumichi Yamakoshi, Hirotsugu Miyauchi, Mitsunobu Fukumoto, Kyoji Kimoto, Itaru Watanabe, Shigeo Yokoyama
  • Reinforced ion-exchange membrane
    Patent number: 4072793
    Abstract: A leno-woven fabric of a specific construction is found to effectively reinforce an ion-exchange membrane at a scarce density of reinforcing yarns to improve electrochemical property of the reinforced ion-exchange membrane.
    Type: Grant
    Filed: July 15, 1976
    Date of Patent: February 7, 1978
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Itaru Watanabe, Yasumichi Yamakoshi, Hirotsugu Miyauchi, Sakae Tsushima, Mitsunobu Fukumoto