Patents by Inventor Hirotsugu Tomizawa

Hirotsugu Tomizawa 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).

  • Position detector
    Patent number: 6469696
    Abstract: There is provided a position detector including a member having a surface and a plurality of vertically and horizontally arranged antennas; a controller for sequentially driving the vertically arranged antennas in vertical positive and vertical negative directions, and for sequentially driving the horizontally arranged antennas in horizontal positive and horizontal negative directions so that the antennas sequentially radiate radio waves; a receiver for receiving the sequentially radiated radio waves on the surface of the member; and a detector for detecting the position of the receiver on the surface of the member based on the levels of the received radio waves.
    Type: Grant
    Filed: October 12, 1999
    Date of Patent: October 22, 2002
    Assignee: Sega Enterprises, Ltd.
    Inventors: Yoshifumi Ishimura, Hirotsugu Tomizawa
  • Information display system for electronically reading a book
    Patent number: 6297812
    Abstract: An information display system having a housing with a location for receiving a document such as a book is provided. A location detection circuit is mounted on the housing adjacent the document and can determine any subjective selection of a location on the document. The document can have a plurality of indicia. When such indicia is selected, a control circuit can retrieve the information from a read only memory and appropriately display the information in an audible or visual manner.
    Type: Grant
    Filed: December 16, 1999
    Date of Patent: October 2, 2001
    Assignee: Sega Enterprises, Ltd.
    Inventors: Makoto Ohara, Hirotsugu Tomizawa, Shinichirou Sugiura
  • Information display system for electronically reading a book
    Patent number: 6052117
    Abstract: An information display system having a housing with a location for receiving a document such as a book is provided. A location detection circuit is mounted on the housing adjacent the document and can determine any subjective selection of a location on the document. The document can have a plurality of indicia. When such indicia is selected, a control circuit can retrieve the information from a read only memory and appropriately display the information in an audible or visual manner.
    Type: Grant
    Filed: April 27, 1995
    Date of Patent: April 18, 2000
    Assignee: Sega Enterprises, Ltd.
    Inventors: Makoto Ohara, Hirotsugu Tomizawa, Shinichirou Sugiura
  • Information display system for electronically reading a book
    Patent number: 5485176
    Abstract: An information display system having a housing with a location for receiving a document such as a book is provided. A location detection circuit is mounted on the housing adjacent the document and can determine any subjective selection of a location on the document. The document can have a plurality of indicia. When such indicia is selected, a control circuit can retrieve the information from a read only memory and appropriately display the information in an audible or visual manner.
    Type: Grant
    Filed: June 23, 1994
    Date of Patent: January 16, 1996
    Assignee: Kabushiki Kaisha Sega Enterprises
    Inventors: Makoto Ohara, Hirotsugu Tomizawa, Shinichirou Sugiura
  • Air action toy system
    Patent number: 5092808
    Abstract: There is disclosed an action toy system comprising a base, an air blower, and unit toys connected with holes formed in the surface of the base. The blower blows air into the unit toys through the base and the holes to cause the toys to perform action.
    Type: Grant
    Filed: March 20, 1991
    Date of Patent: March 3, 1992
    Assignee: Sega Enterprises, Ltd.
    Inventors: Akira Takasaka, Eiji Takuma, Hirotsugu Tomizawa