Patents by Inventor Atushi Kakuta

Atushi Kakuta 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 non-linear optical device
    Patent number: 5101411
    Abstract: In a semiconductor laser wavelength conversion device comprising a semiconductor laser beam souce, a lens, a single crystal of a non-linear optical material and a filter, the non-linear optical material is represented by the general formula, A--(Cx)--B, where (Cx) is --(CH)--or --CH.dbd.CH--C(.dbd.CH)--, A and B are each atomic group comprising a .pi.-electron conjugated structure containing at least one electron withdrawing group or one electron donating group. The device can generate a second harmonic wave having an intensity of 4 or more stronger than that of urea and having a cutoff wavelength of 420 nm or less.
    Type: Grant
    Filed: September 28, 1990
    Date of Patent: March 31, 1992
    Assignee: Hitachi, Ltd.
    Inventors: Hiromu Terao, Kayo Ohno, Yuzo Ito, Masato Isogai, Tomoyuki Hamada, Yasuo Imanishi, Atushi Kakuta