Patents by Inventor Takayasu Nihira

Takayasu Nihira 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).

  • Diaminobenzene derivatives and polyimides prepared therefrom
    Patent number: 5861534
    Abstract: A diaminobenzene derivative of the formula (I): ##STR1## wherein each of P and Q which may be the same or different from each other, is a single bond, or a bivalent organic group selected from the group consisting of --O--, --COO-- and --CONH--, R.sub.1 is a C.sub.2-22 straight chain alkylene group, and R.sub.2 is a cyclic group selected from the group consisting of an aromatic ring, an aliphatic ring, a heterocyclic ring and substituted forms of such rings.
    Type: Grant
    Filed: September 10, 1996
    Date of Patent: January 19, 1999
    Assignee: Nissan Chemical Industries, Ltd.
    Inventors: Takayasu Nihira, Yoshio Miyamoto, Hideyuki Endo, Toyohiko Abe
  • Diaminobenzene derivatives and polyimides prepared therefrom
    Patent number: 5665856
    Abstract: A diaminobenzene derivative of the formula (I): ##STR1## wherein each of P and Q which may be the same or different from each other, is a single bond, or a bivalent organic group selected from the group consisting of --O--, --COO-- and --CONH--, R.sub.1 is a C.sub.2-22 straight chain alkylene group, and R.sub.2 is a cyclic group selected from the group consisting of an aromatic ring, an aliphatic ring, a heterocyclic ring and substituted forms of such rings.
    Type: Grant
    Filed: April 25, 1995
    Date of Patent: September 9, 1997
    Assignee: Nissan Chemical Industries, Ltd.
    Inventors: Takayasu Nihira, Yoshio Miyamoto, Hideyuki Endo, Toyohiko Abe
  • Liquid crystal alignment film
    Patent number: 5608033
    Abstract: A liquid crystal alignment film made of a polyimide which has, on its side chain, a benzene or biphenyl ring substituted by a monovalent substituent having a positive value as the .sigma.p value under Hammett's rule.
    Type: Grant
    Filed: May 5, 1995
    Date of Patent: March 4, 1997
    Assignee: Nissan Chemical Industries, Ltd.
    Inventors: Takayasu Nihira, Yoshio Miyamoto, Hideyuki Endo, Toyohiko Abe