Patents by Inventor Yasuhiko Yokowo

Yasuhiko Yokowo 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).

  • Organic nonlinear optical material
    Patent number: 5225577
    Abstract: An organic nonlinear optical material comprising a 4-nitrophenylaminoacetaldehyde acetal of the following formula (I): ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 each represent a hydrogen atom, or a linear or branched alkyl group having 1 to 6 carbon atoms, and R.sub.4 represents a hydrogen atom, a linear or branched alkyl group having 1 to 6 carbon atoms, a linear or branched alkoxy group having 1 to 6 carbon atoms, a hydroxyl group, a nitro group or a halogen atom.
    Type: Grant
    Filed: February 24, 1992
    Date of Patent: July 6, 1993
    Assignees: Naoya Ogata, Seizo Miyata, Ube Industries, Ltd., Research Development
    Inventors: Naoya Ogata, Yasuhiko Yokowo
  • Organic nonlinear optical material
    Patent number: 5112906
    Abstract: Disclosed are an organic nonlinear optical material comprising a 4-nitrophenylaminoacetaldehyde acetal represented by the following general formula: ##STR1## and a polymeric organic nonlinear optical material comprising an acetalized polyvinyl alcohol having the above-mentioned 4-nitrophenylaminoacetaldehyde acetal as the side chain.
    Type: Grant
    Filed: April 5, 1990
    Date of Patent: May 12, 1992
    Assignees: Naoya Ogata, Seizo Miyata, Ube Industries Ltd., Research Development Corporation of Japan
    Inventors: Naoya Ogata, Yasuhiko Yokowo