Patents by Inventor Asumaru Nakamura

Asumaru Nakamura 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).

  • Patent number: 4938902
    Abstract: An aromatic imide polymer hollow filament having an excellent gas separating property is produced by a process comprising the steps of:(1) dissolving an aromatic imide copolymer comprising(A) 20 to 85 molar % of recurring units of the formula (I): ##STR1## (B) 10 to 35 molar % of recurring units of the formula (II): ##STR2## and (C) 5 to 55 molar % of recurring units of the formula (III): ##STR3## wherein R represents a divalent radical of the formula (IV) or (V): ##STR4## wherein R.sup.1 and R.sup.
    Type: Grant
    Filed: February 3, 1988
    Date of Patent: July 3, 1990
    Assignee: Director General of Agency of Industrial Science & Technology
    Inventors: Asumaru Nakamura, Yoshihiro Kusuki, Takashi Harada
  • Patent number: 4830640
    Abstract: An aromatic imide polymer hollow filament having an excellent gas separating property is produced by a process comprising the steps of:(1) dissolving an aromatic imide copolymer comprising (A) 20 to 85 molar % of recurring units of the formula (I): ##STR1## (B) 10 to 35 molar % of recurring units of the formula (II): ##STR2## and (C) 5 to 55 molar % of recurring units of the formula (III): ##STR3## wherein R represents a divalent radical of the formula (IV) or (V): ##STR4## and ##STR5## wherein R.sup.1 and R.sup.
    Type: Grant
    Filed: March 4, 1987
    Date of Patent: May 16, 1989
    Assignee: Agency of Industrial Science and Technology
    Inventors: Asumaru Nakamura, Yoshihiro Kusuki, Takashi Harada
  • Patent number: 4378324
    Abstract: A polyimide semipermeable membrane is prepared by the process comprising the steps of:preparing a solution of a polyimide material consisting essentially of at least one aromatic polyimide comprising at least 90 molar % of at least one recurring unit of the formula (I): ##STR1## wherein R represents a divalent aromatic radical, in a solvent consisting of at least one phenol compound in the state of a liquid or melt;forming a thin layer of the polyimide solution, and;coagulating the thin layer of the polyimide solution by bringing the thin layer into contact with a coagulating liquid to form a semipermeable membrane.
    Type: Grant
    Filed: July 23, 1980
    Date of Patent: March 29, 1983
    Assignee: Ube Industries, Ltd.
    Inventors: Hiroshi Makino, Yoshihiro Kusuki, Hiroshi Yoshida, Asumaru Nakamura