Patents by Inventor Ryouji Nakajima

Ryouji Nakajima 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).

  • Electronic key, electronic locking apparatus, electronic security system, and key administering server
    Patent number: 7543755
    Abstract: An electronic security system is provided with an electronic key and an electronic locking apparatus. The electronic key includes an identification data registry for storing one or more identification data for locking and unlocking. The electronic locking apparatus includes a key data registry for storing a key data having a predetermined relationship with an identification data of an electronic key corresponding to the electronic locking apparatus. The system includes with a reader/writer for reading and writing the identification data in and from the identification data registry. This system ensures an improved convenience by making a single key compatible with a plurality of objects.
    Type: Grant
    Filed: December 27, 2002
    Date of Patent: June 9, 2009
    Assignee: Panasonic Electric Works Co., Ltd.
    Inventors: Kenji Doi, Takashi Nishiyama, Ryouji Nakajima, Masaru Hashimoto, Kenshi Suzuki, Yoshiko Tsuji, Tokuhisa Nishimura
  • Non-invasive brain function examination
    Patent number: 6669651
    Abstract: A brain function examining apparatus and others for performing an examination of a brain function by detecting a pupillary size of a subject's pupil are provided. The brain function examining apparatus includes a light source for illuminating the pupil, a pupillary detector for detecting the pupillary size, an index calculator for calculating, based on the pupillary size detected by the pupillary detector, a subject index indicative of a characteristic of the pupil, a database for storing a base index indicative of a characteristic of the pupil that can be used as reference, and an output unit for outputting the subject index, calculated by the index calculator, and the base index stored in the database.
    Type: Grant
    Filed: October 23, 2000
    Date of Patent: December 30, 2003
    Assignee: Matsushita Electric Works, Ltd.
    Inventors: Shogo Fukushima, Kenshi Suzuki, Shuji Murakami, Ryouji Nakajima, Ichiro Fukumoto, Hisashi Uchiyama
  • Electronic key, electronic locking apparatus, electronic security system, and key administering server
    Publication number: 20030122651
    Abstract: An electronic security system is provided with an electronic key and an electronic locking apparatus. The electronic key includes an identification data registry for storing one or more identification data for locking and unlocking. The electronic locking apparatus includes a key data registry for storing a key data having a predetermined relationship with an identification data of an electronic key corresponding to the electronic locking apparatus. The system is provided with a reader/writer for reading and writing the identification data in and from the identification data registry. This system ensures an improved convenience by making a single key compatible with a plurality of objects.
    Type: Application
    Filed: December 27, 2002
    Publication date: July 3, 2003
    Applicant: Matsushita Electric Works, Ltd.
    Inventors: Kenji Doi, Takashi Nishiyama, Ryouji Nakajima, Masaru Hashimoto, Kenshi Suzuki, Yoshiko Tsuji, Tokuhisa Nishimura