Patents by Inventor Takeo Ozeki

Takeo Ozeki 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: 8907767
    Abstract: Systems and techniques for reading radio frequency identification (RFID) tags and determining the distance between a reader and a tag being read. A plurality of interrogation signals are transmitted to an RFID tag, with signals at a first frequency being transmitted at a plurality of antenna polarizations and signals at a second frequency being transmitted at a plurality of antenna polarizations. The antenna polarizations are chosen such that return signals resulting from the signals and traveling along reflective paths will sum to zero. Return signals received from the tag are averaged, and phase shift information exhibited by the return signals is determined. The phase shift information for the return signals and frequency information for the interrogation signals is used to compute the distance between the reader and the tag.
    Type: Grant
    Filed: September 4, 2008
    Date of Patent: December 9, 2014
    Assignee: NCR Corporation
    Inventors: Takeo Ozeki, Yoshitaki Utsumi
  • Publication number: 20100052857
    Abstract: Systems and techniques for reading radio frequency identification (RFID) tags and determining the distance between a reader and a tag being read. A plurality of interrogation signals are transmitted to an RFID tag, with signals at a first frequency being transmitted at a plurality of antenna polarizations and signals at a second frequency being transmitted at a plurality of antenna polarizations. The antenna polarizations are chosen such that return signals resulting from the signals and traveling along reflective paths will sum to zero. Return signals received from the tag are averaged, and phase shift information exhibited by the return signals is determined. The phase shift information for the return signals and frequency information for the interrogation signals is used to compute the distance between the reader and the tag.
    Type: Application
    Filed: September 4, 2008
    Publication date: March 4, 2010
    Applicant: NCR Corporation
    Inventors: Takeo Ozeki, Yoshitaki Utsumi