Patents by Inventor Youichi Ushiyama

Youichi Ushiyama 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).

  • Colored contact lens and method for producing the same
    Patent number: 5708049
    Abstract: A contact lens colored with a poly(meth)acrylate-combined metallophthalocyanine compound represented by the following formula (I): ##STR1## wherein M represents a metal atom to which phthalocyanine can coordinate, R represents a halogen atom, m is an integer of 0 to 4, R.sup.1 represents a hydrogen atom or a methyl group, and A represents a hydrogen atom, a C.sub.1-12 alkyl group, a hydroxyC.sub.1-12 alkyl group or a glycerol group. The colored contact lens has sufficiently high fastness, so that the lens undergoes neither color change nor color fading even when it is sterilized by boiling.
    Type: Grant
    Filed: February 7, 1996
    Date of Patent: January 13, 1998
    Assignee: Seiko Epson Corporation
    Inventors: Hiroshi Katagiri, Tadao Kojima, Youichi Ushiyama