Patents by Inventor Athuro Sekiyama

Athuro Sekiyama 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).

  • Cemented plastic lens
    Patent number: 5253111
    Abstract: A cemented plastic lens is formed of two plastic lenses made of dissimilar synthetic resin materials having different coefficients of thermal expansion. The lenses have mating surfaces that have macroscopically the same curvature, and the mating surfaces are bonded together with a soft adhesive that is capable of elastic deformation by itself in a hardened state and that has the ability to attenuate the stress that will develop at the cemented interface due to the thermal expansion mismatch.
    Type: Grant
    Filed: October 24, 1991
    Date of Patent: October 12, 1993
    Assignee: Asahi Kogaku Kogyo K.K.
    Inventors: Toru Chiba, Athuro Sekiyama, Mitsuo Gacho