Patents by Inventor Meguru Ohara

Meguru Ohara 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).

  • Optical material
    Patent number: 5622812
    Abstract: An optical material contains a photochromic compound which is expressed in the following general formula (I): ##STR1## where A represents an oxygen atom, a nitrogen atom, or a substituted nitrogen atom, B represents a thiophene ring, benzothiophene ring, pyrrole ring or indole ring, R.sub.1 represents a methyl group, an alkoxy group or a perfluoroalkyl group, R.sub.2 to R.sub.7 represent a hydrogen atom, a halogen atom, a hydroxy group, an alkyl group and the like respectively. This photochromic compound may be bonded with a polymer as a side chain in the position of A.
    Type: Grant
    Filed: March 6, 1995
    Date of Patent: April 22, 1997
    Assignees: Sanyo Electric Co., Ltd., Masahiro Irie, Kobe Natural Products
    Inventors: Fumio Tatezono, Toshio Harada, Masahiro Irie, Meguru Ohara
  • Optical recording material and optical recording medium employing the same
    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