Patents by Inventor Kouichi Takeuchi

Kouichi Takeuchi 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).

  • Patent number: 5475666
    Abstract: A recording device for recording information upon optically modulated overwritable magneto-optical recording medium including four magnetic layers first records DC "1" and then a test signal at high and low recording laser power levels upon a test track of the recording medium. The high and low recording laser power levels are successively modified to scan a two-dimensional region of the high and low recording laser power levels, and the optimal high and low recording laser power levels are determined on the basis of the reproduction signal levels corresponding to respective combination of high and low recording laser power levers. The reproduction signal levels are represented upon the .alpha.-K plane which is divided into six characteristic regions, The optimal combination of high and low recording laser power levels is determined as a representative point within the region of correct reproduction with a predetermined allowance.
    Type: Grant
    Filed: March 3, 1993
    Date of Patent: December 12, 1995
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Masaya Ito, Osamu Ito, Kouichi Yamada, Masayoshi Shimamoto, Yoshiki Nakajima, Kouichi Takeuchi, Kyousuke Yoshimoto
  • Patent number: 5019781
    Abstract: An impedance meter with improved measurement accuracy obtained by controlling the level of the signal source. The impedance meter comprises a signal source, feedback amplifier, synchronous detector, A/D and control logic. The source level is maintaind by the control logic at a predetermined value by measuring the output of a synchronous detector and intermittently adjusting the level of the source thereby compensating for variations in test object's impedance. Control logic algorithms employed include successive substitution, bisection and linear interpolation.
    Type: Grant
    Filed: October 25, 1990
    Date of Patent: May 28, 1991
    Assignee: Hewlett-Packard Company
    Inventors: Shigeru Tanimoto, Kouichi Takeuchi
  • Patent number: 4066707
    Abstract: Diphenols, alkyl ethers and aryl ethers of diphenols are produced by subjecting phenols, alkyl ethers and aryl ethers of phenols to oxidation with an organic per-acid in the presence of at least one member selected from the group consisting of acetyl acetone and acetonyl acetone as the catalyst.
    Type: Grant
    Filed: August 25, 1976
    Date of Patent: January 3, 1978
    Assignees: Agency of Industrial Science & Technology, Mitsui Toatsu Chemicals, Incorporated
    Inventors: Kiyoshi Nakatani, Juichi Imamura, Toshiyuki Ichikawa, Kouichi Takeuchi, Kenji Kotaka
  • Patent number: 4051513
    Abstract: A color image projecting apparatus having three cathode ray tubes which produce different respective color images and including two projecting lenses. A first primary color image reproduced on a first cathode ray tube is projected on a screen through a first projecting lens, and second and third primary color images reproduced on second and third cathode ray tubes, respectively, are synthesized by a dichroic mirror and then projected on the screen through a second projecting lens. In this case, the projecting axes of the first and second projecting lenses are arranged to converge two images passed therethrough on the screen.
    Type: Grant
    Filed: March 5, 1976
    Date of Patent: September 27, 1977
    Assignee: Sony Corporation
    Inventors: Kouichi Takeuchi, Norio Itoh, Kuniyoshi Koyama, Satoshi Shimada, Masami Himuro