Patents by Inventor Mitsuyuki Ohno

Mitsuyuki Ohno 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).

  • Process for producing polyamides with lactam or urea solvent and CaCl.sub.2
    Patent number: 4172938
    Abstract: An aromatic polyamide having a high degree of polymerization is produced by polymerizing(A) a mixture of an aromatic diamine of the formula (1):H.sub.2 N--Ar.sub.1 --NH.sub.2 (1)and an aromatic dicarboxylic acid dihalide of the formula (2):XOC--Ar.sub.2 --COX (2)(b) a mixture of the aromatic diamine of the formula (1), the aromatic dicarboxylic acid dihalide of the formula (2) and a hydrogen halide salt of an aromatic amino carboxylic acid halide of the formula (3):XH.multidot.H.sub.2 N--Ar.sub.3 --COX (3)or(C) the hydrogen halide salt of the aromatic amino carboxylic acid halide of the formula (3) alone,Wherein Ar.sub.1, Ar.sub.2 and Ar.sub.
    Type: Grant
    Filed: June 13, 1977
    Date of Patent: October 30, 1979
    Assignee: Teijin Limited
    Inventors: Hiroshi Mera, Yasuo Nakagawa, Masahiro Yamaguchi, Mitsuyuki Ohno