Patents by Inventor Yasuhiko Hirabayashi

Yasuhiko Hirabayashi 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).

  • Method for regenerating inorganic porous particles, method for purifying water, and continuous water purification device
    Patent number: 6660165
    Abstract: The present invention is to provide a method for regenerating inorganic porous particles, a method for purifying water and a continuous water purification device, which can be easily applied as a recycling system of water in special environments such as space environment, by safely removing impurities contained in water and water vapor with a usage of a compact facility without using any chemicals. The method for regenerating inorganic porous particles is characterized in that adsorbed products such as ammonia and/or amines, are reduced by heating to 100-200° C. under a reduced pressure of 10 Pa or less. The method for purifying water and the continuous water purification device are characterized in that a dense membrane having cationic groups and/or a composite membrane in which a hydrophilic membrane is layered on a surface of a hydrophobic porous membrane is used as a permeable membrane are used as a permeable membrane.
    Type: Grant
    Filed: October 30, 2000
    Date of Patent: December 9, 2003
    Assignees: Japan, represented by Director General of Forestry and Forest Products Research Institute Forestry Agency, Ministry of Argriculture Forestry and Fisheries, The National Space Development Agency of Japan, The Japan Space Forum
    Inventors: Yasuhiko Hirabayashi, Nobukazu Onishi
  • Process for producing wood adsorbents for mercury ions by graft polymerization of acrolein onto xanthated wood meal followed by conversion to thiosemicarbazone
    Patent number: 4258136
    Abstract: A novel wood adsorbent for mercury ions is provided by the process of this invention. The process comprises xanthating an alkali wood meal, impregnating the xanthated wood meal with a solution of a peroxide, graft copolymerizing the product with acrolein in gas phase, and converting acrolein aldehyde groups on the resulting graft copolymer to thiosemicarbazone to obtain the novel wood adsorbent for mercury ion. The novel wood adsorbent has a great adsorbing capacity for mercury ion.
    Type: Grant
    Filed: March 2, 1979
    Date of Patent: March 24, 1981
    Assignee: Forestry and Forest Products Research Institute, Ministry of Agriculture, Forestry and Fisheries
    Inventors: Yasuhiko Hirabayashi, Toshihiro Murayama