Patents by Inventor Kuniyuki Nakayama

Kuniyuki Nakayama 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).

  • Modulation-demodulation apparatus and wireless communication apparatus
    Patent number: 7406301
    Abstract: A modulation-demodulation apparatus of a relatively simple arrangement is able to prevent a bad influence caused due to interference between two local oscillators and a portable wireless communication apparatus uses this modulation-demodulation apparatus. In a modulation-demodulation apparatus using a local oscillator (105) for use in direct conversion type of a receiving system and a local oscillator (104) for use with a transmitting system, a ratio (C/D) between a reception frequency and an oscillation frequency of the reception local oscillator (105) and a ratio (A/B) between a transmission frequency and an oscillation frequency of the transmission local oscillator are made different from each other.
    Type: Grant
    Filed: April 30, 2003
    Date of Patent: July 29, 2008
    Assignees: Sony Ericsson Mobil Communicatons Japan, Inc., Asahi Kasei EMD Corporation
    Inventors: Masaaki Kasahara, Shinji Miya, Kuniyuki Nakayama
  • Modulation-demodulation apparatus and wireless communication apparatus
    Publication number: 20040033785
    Abstract: A modulation-demodulation apparatus of a relatively simple arrangement is able to prevent a bad influence caused due to interference between two local oscillators and a portable wireless communication apparatus uses this modulation-demodulation apparatus. In a modulation-demodulation apparatus using a local oscillator (105) for use in direct conversion type of a receiving system and a local oscillator (104) for use with a transmitting system, a ratio (C/D) between a reception frequency and an oscillation frequency of the reception local oscillator (105) and a ratio (A/B) between a transmission frequency and an oscillation frequency of the transmission local oscillator are made different from each other.
    Type: Application
    Filed: April 30, 2003
    Publication date: February 19, 2004
    Inventors: Masaaki Kasahara, Shinji Miya, Kuniyuki Nakayama
  • Method for producing microporous separator for electrochemical cell
    Patent number: 4098930
    Abstract: A method for producing a microporous separator for an electrochemical cell comprises dissolving a copolymer of acrylonitrile into N,N-dimethylformamide, impregnating an acid- and/or alkali-resistant fibrous web with the resultant solution, and thereafter dipping the impregnated web into an aqueous coagulating bath, whereby the copolymer deposits on and between the web fibers to form a microporous matrix. The aqueous coagulating bath is selected from the group consisting of water at a temperature of 15.degree. C or below and aqueous solutions of a water-soluble acid solute, basic solute, or netural solute at a concentration of one mol / 1 or above. This method yields products having low maximum pore radii and yet low electric resistances.
    Type: Grant
    Filed: November 22, 1976
    Date of Patent: July 4, 1978
    Assignee: The Fujikawa Cable Works, Ltd.
    Inventors: Shiro Nakayama, Kuniyuki Nakayama, Ikuo Nakaya