Patents Assigned to Kobe Natural Products & Chemicals Co., Ltd.
  • Patent number: 5443940
    Abstract: Disclosed herein is an optical recording material containing a photochromic compound which is expressed in the following general formula (I): ##STR1## where A represents an oxygen atom or a substituted or unsubstituted nitrogen atom, R.sub.1 represents an alkoxy group, R.sub.2 to R.sub.5 represent substituents such as a hydrogen atom, a halogen atom, a hydroxy group, a substituted or unsubstituted alkyl group and the like respectively, and B represents a substituted or unsubstituted thiophene ring, benzothiophene ring, pyrrole ring or indole ring.
    Type: Grant
    Filed: April 14, 1993
    Date of Patent: August 22, 1995
    Assignees: Sanyo Electric Co., Ltd., Kobe Natural Products & Chemicals Co., Ltd.
    Inventors: Fumio Tatezono, Toshio Harada, Masahiro Irie, Meguru Ohara