Patents by Inventor Ken Ueda

Ken Ueda 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).

  • Positron computed tomograph device
    Patent number: 4575868
    Abstract: A positron-computed tomograph device is enabled to suppress the noise component of data for attenuation correction by continuing measurement of the relative angle between a gamma ray source for attenuation correction and detector pair out of a plurality of detectors thereby determining whether or not, at a given moment, the gamma ray source is present within the zone of measurement allocated for a specific detector pair which has detected coincidence and, when the determination ascertains that the source is not present in the aforementioned zone of measurement, avoiding measurement of coincidence or preventing data on coincidence from being stored in a memory.
    Type: Grant
    Filed: September 9, 1983
    Date of Patent: March 11, 1986
    Assignees: Agency of Industrial Science & Technology, Ministry of International Trade & Industry
    Inventors: Ken Ueda, Kenichi Okajima, Katsumi Takami
  • Compositions for solid writing materials and writing implements
    Patent number: 4212676
    Abstract: This invention relates to solid writing materials capable of giving writings, drawings or markings which are readily erasable with a dry eraser such as a blackboard eraser, dry fabric, etc.This invention provides compositions for such solid writing materials comprising (i) an emulsifiable polyethylene wax, (ii) a liquid organic compound substantially incompatible with the component (i) and having a specified boiling point and viscosity, (iii) an organic solvent capable of dissolving or uniformly dispersing the components (i) and (ii) and having a specified boiling point and (iv) a pigment.
    Type: Grant
    Filed: February 13, 1979
    Date of Patent: July 15, 1980
    Assignee: Sakura Color Products Corporation
    Inventor: Ken Ueda
  • Scintillator for a gamma ray camera
    Patent number: 4145609
    Abstract: A scintillator for a gamma ray camera constituted by a crystal of NaI (Tl) having a surface roughness of less than 400 grit and a thickness of less than approximately 9 mm.
    Type: Grant
    Filed: November 22, 1976
    Date of Patent: March 20, 1979
    Assignee: Hitachi Medical Corporation
    Inventors: Katsumi Takami, Ken Ueda, Fumio Kawaguchi, Teruichi Tomura, Kenji Ishimatsu
  • Scintillator for gamma ray camera
    Patent number: 4090081
    Abstract: A scintillator for a gamma ray camera includes a pair of crystals mechanically pressed together. The surfaces of the crystals are roughened so as to form a photo-diffuser for the light generated as a result of scintillation.
    Type: Grant
    Filed: July 28, 1976
    Date of Patent: May 16, 1978
    Assignee: Hitachi Medical Corporation
    Inventors: Katsumi Takami, Ken Ueda, Fumio Kawaguchi, Teruichi Tomura, Kenji Ishimatsu