Patents by Inventor Keisuke Asai

Keisuke Asai 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).

  • Publication number: 20040084654
    Abstract: This invention relates to a radiation detection device for detecting ionizing beam discharges such as gamma rays, x-rays, electron beams, charged particle beams and neutral particle beams. Specifically, it relates to a radiation detection device which can measure radiations which exist for a very short time (of the order of subnanoseconds or less) from the appearance of photoemission to extinction.
    Type: Application
    Filed: July 29, 2002
    Publication date: May 6, 2004
    Inventors: Kengo Shibuya, Masanori Koshimizu, Yuko Takeoka, Keisuke Asai
  • Patent number: 6716927
    Abstract: Amines having an unsaturated bond can be introduced into the organic layer of organic-inorganic laminar perovskite compounds comprising a metal halide and an organic amine, and the organic layer can be polymerized by applying external energy such as by irradiating with UV light or radiation. In this way, the quantum well structure is stabilized. The organic-inorganic laminar perovskite polymer compound is produced by cross-linking unsaturated bonds of an organic-inorganic laminar perovskite compound represented by the general formula (RNH3)2MX4 (in the formula, R is a hydrocarbon group having an unsaturated bond, X is a halogen or mixture of same, M is Group IVa metal, Eu, Cd, Cu, Fe, Mn or Pd). R is represented by CH3(CH2)nC≡C—C≡CCH2 (n=2-14). It is preferred that M is Pb, and X is a bromine atom.
    Type: Grant
    Filed: July 29, 2002
    Date of Patent: April 6, 2004
    Assignee: Japan Science and Technology Agency
    Inventors: Yuko Takeoka, Keisuke Asai
  • Publication number: 20030235513
    Abstract: The present invention provides an optical oxygen concentration measurement method and optical oxygen concentration measuring sensor wherein a light-absorbing dye-molecule layer whose absorption spectrum varies depending on the bonding with oxygen molecules is combined with a light-emitting layer, and the oxygen concentration of the ambient fluid can be measured. The light-absorbing layer 4 laminated to an oxygen-quenching light-emitting layer 3 is a film comprising a cobalt-porphyrin complex (CoP) or other light-absorbing dye molecule 7 whose absorption spectrum varies depending on the bonding with oxygen molecules. When the degree of overlap with the light emission spectrum or excitation (absorption) spectrum of the light-emitting layer 3 varies as a result of a variation in the absorption spectrum possessed by the light-absorbing layer 4, the light intensity of output light varies in accordance with the degree of overlap, and the oxygen concentration of the ambient fluid can be measured.
    Type: Application
    Filed: June 12, 2003
    Publication date: December 25, 2003
    Applicant: NATIONAL AEROSPACE LABORATORY OF JAPAN
    Inventors: Keisuke Asai, Hiroyuki Nishide, Ichiro Okura
  • Publication number: 20030175511
    Abstract: An oxygen-quenching luminophore constituting part of a pressure-sensitive luminophore is directly bonded by a covalent bond to an organic polymer compound having trimethylsilyl groups, so the luminophore molecules are retained in the polymer and free aggregation is inhibited when the organic solvent is evaporated. It is therefore possible to prevent light response from being reduced by the aggregation of the luminophore molecules during evaporation of the organic solvent, which is a drawback of forming films from conventional mixed-type pressure-sensitive paints. A thin-film sensor with uniform characteristics can be formed by spraying or application from a pressure-sensitive paint obtained by mixing a functional polymer with a solvent. In addition, a coating solution that has high reproducibility and is suitable for spraying or application can be obtained merely by dissolving the functional polymer as a single component in a suitable solvent.
    Type: Application
    Filed: March 13, 2003
    Publication date: September 18, 2003
    Applicant: NATIONAL AEROSPACE LABORATORY
    Inventors: Keisuke Asai, Hiroyuki Nishide
  • Publication number: 20030096902
    Abstract: It is an object of this invention to increase the stability of the quantum well structure of laminar perovskite compounds having excellent optical characteristics and possible applications in light emitting elements.
    Type: Application
    Filed: July 29, 2002
    Publication date: May 22, 2003
    Inventors: Yuko Takeoka, Keisuke Asai
  • Patent number: D411814
    Type: Grant
    Filed: August 18, 1998
    Date of Patent: July 6, 1999
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Shinri Chibuka, Youji Hayashi, Masashi Shimada, Keisuke Asai