Patents by Inventor Ryoshu Suzuki

Ryoshu Suzuki 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).

  • Semipermeable membrane
    Patent number: 4292417
    Abstract: A semipermeable membrane composed of a water-insoluble, cross-linked, membrane-forming polymer (hereinafter referred to as "polymer (II)") which is obtained by partially converting the hydroxyl groups of a polymer represented by the following formula (hereinafter referred to as "polymer (I)"): ##STR1## wherein R and R' are halogen, nitro, methyl or ethyl,X stands for a divalent group selected from methylene, ethylene, isopropylidene, ether (--O--), carbonyl (--CO--), sulfide (--S--), sulfoxide (--SO--) and sulfone (--SO.sub.2 --),l and m are integers of from 0 to 4, p is 0 or 1, andn is an integer of from 100 to 1000,to sulfuric acid groups or alkali metal, ammonium or nitrogen-containing basic organic compound salts thereof, and then cross-linking the "polymer (II)".
    Type: Grant
    Filed: September 20, 1979
    Date of Patent: September 29, 1981
    Assignee: Daicel Ltd.
    Inventors: Kiyoshi Ishii, Ryoshu Suzuki, Zenjiro Honda, Hitoshi Tsugaya
  • Semipermeable membrane of phenoxy resin containing sulfuric acid groups or salts thereof
    Patent number: 4200726
    Abstract: A semipermeable membrane composed of a water-insoluble, membrane-forming polymer (hereinafter referred to as "polymer (II)") which is obtained by partially converting the hydroxyl groups of a polymer represented by the following formula (hereinafter referred to as "polymer (I)"): ##STR1## wherein R and R' are halogen, nitro, methyl or ethyl, X stands for a divalent group selected from methylene, ethylene, isopropylidene, ether (--O--), carbonyl (--CO--), sulfide (--S--), sulfoxide (--SO--) and sulfone (--SO.sub.2 --), l and m are integers of from 0 to 4, p is 0 or 1, and n is an integer of from 100 to 1000,to sulfuric acid groups or alkali metal, ammonium or nitrogen-containing basic organic compound salts thereof.
    Type: Grant
    Filed: May 30, 1978
    Date of Patent: April 29, 1980
    Assignee: Daicel Ltd.
    Inventors: Kiyoshi Ishii, Ryoshu Suzuki, Zenjiro Honda, Hitoshi Tsugaya