Patents by Inventor Takashi Yamaji

Takashi Yamaji 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).

  • Polybenzoxazole resin and precursor thereof
    Patent number: 6114497
    Abstract: Polybenzoxazole precursors are used to prepare resins with good electrical characteristics and thermal characteristics as well as low water absorption.
    Type: Grant
    Filed: October 26, 1999
    Date of Patent: September 5, 2000
    Assignee: Sumitomo Bakelite Company Limited
    Inventors: Masahiro Tada, Mitsumoto Murayama, Takuya Hatao, Takashi Yamaji
  • Volume holographic memory apparatus having a reference beam and a signal beam with opposite intensity distributions
    Patent number: 6088321
    Abstract: A volume holographic memory-based optical information-recording/reproducing apparatus is capable of enhancing density of spatial multiple recording. A recording medium is mounted in the apparatus for recording a three-dimensional optical interference pattern formed by at least two coherent light beams as spatial changes in refractive index of the recording medium. A signal beam optical system supplies a coherent signal beam to the recording medium through a Fourier transform lens. A reference beam optical system supplies a coherent reference beam to the recording medium. The reference beam is caused to intersect with the signal beam within the recording medium and an angle of intersection between the reference beam and the signal beam is changed. Diffracted light of the reference beam diffracted from the recording medium is detected.
    Type: Grant
    Filed: March 23, 1999
    Date of Patent: July 11, 2000
    Assignee: Pioneer Electronic Corporation
    Inventors: Takashi Yamaji, Hideki Hatano, Satoru Tanaka
  • Volume holographic memory
    Patent number: 6049401
    Abstract: A volume holographic memory whose three-dimensional photosensitive body has exposed portions comprised only of continuous faces prevents recording of noise caused by scattered light at the time of light irradiation.
    Type: Grant
    Filed: October 5, 1998
    Date of Patent: April 11, 2000
    Assignee: Pioneer Electronic Corporation
    Inventors: Satoru Tanaka, Hideki Hatano, Takashi Yamaji
  • Liquid crystal light valve using non-monochromatic writing light
    Patent number: 5144463
    Abstract: A liquid crystal display unit uses a photoconductive type liquid crystal light valve. By using non-monochromatic light as the writing light, the light excitation can be induced near the surface layer of the photoconductive layer by light of a shorter wavelength and also on portions deep in the layer by light of a longer wavelength. Thus, it is possible to induce the light excitation effectively on the photoconductive layer even when it is thick.
    Type: Grant
    Filed: December 14, 1990
    Date of Patent: September 1, 1992
    Assignee: Pioneer Electronic Corporation
    Inventors: Hideki Hatano, Akira Yokoi, Masayuki Iwasaki, Takashi Yamaji
  • Photo-conductive liquid crystal light valve
    Patent number: 5009490
    Abstract: A photo-conductive liquid crystal display in which the liquid crystal light valve and the electroluminescence element are disposed integrally with each other. The photo-conductive liquid crystal light valve is arranged such that a pair of transparent electrodes are disposed on the outside of a lamination of a photo-conductive layer and a liquid crystal layer, and an electroluminescence element is disposed on the outside of the transparent electrode which is disposed on the writing side of the device.
    Type: Grant
    Filed: June 9, 1989
    Date of Patent: April 23, 1991
    Assignee: Pioneer Electronic Corp.
    Inventors: Tomomitsu Kouno, Hideki Hatano, Takashi Yamaji, Sakashi Ootaki, Masami Nishida