Patents by Inventor Kenji Hatanaka

Kenji Hatanaka 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).

  • Patent number: 6410612
    Abstract: A denture rebase is provided, which includes: (a) an acrylic resin; (b) a fluoro(meth)acrylate having the formula (I): CH2═C(R1)COO—R2—Rf  (I) wherein R1 represents a hydrogen atom or a methyl group; R2 represents an alkylene group; Rf represents a perfluoro alkyl group; R2+Rf has 4 to 10 carbon atoms in total, and wherein at least 50% of all atoms bonded to said carbon atoms constituting R2+Rf are fluorine atoms; (c) a polyfinctional (meth)acrylate; and (d) a polymerization initiator. The denture rebase is free from the serious problems associated with conventional denture rebases. The denture rebase resists discoloration and staining, and it is resistant to the absorption of odorous substances and water. It has good contamination resistance, and its cured product is tough.
    Type: Grant
    Filed: March 3, 2000
    Date of Patent: June 25, 2002
    Assignee: Kuraray Co., Ltd.
    Inventor: Kenji Hatanaka
  • Publication number: 20020016417
    Abstract: A fitting composition capable of fitting a body-worn tool to be used in contact with skin, such as spectacles, a hearing aid, and an artificial limb, suitably to the body shape of individual wearer and thereby realizing the function of the body-worn tool in a steady state, as well as providing an excellent wear-feeling, a body-worn tool produced using the same, and a method of producing the same. The fitting composition for body-worn tools to be used in contact with skin including (a) a thermoplastic block copolymer having at least one polymer block (A) mainly composed of an aromatic vinyl compound and at least one elastic polymer block (B); (b) a (meth)acrylic monomer; and (c) a polymerization initiator.
    Type: Application
    Filed: June 21, 2001
    Publication date: February 7, 2002
    Applicant: KURARAY CO., LTD
    Inventors: Satoshi Yamaguchi, Junichi Yamauchi, Kenji Hatanaka, Mizuho Maeda, Eiichi Masuhara
  • Patent number: 6133343
    Abstract: A cured product of a resinous composition for dental use is neither stained nor discolored while used in the mouth for long periods of time. In addition, the cured product of the composition is not discolored with hot water, and its impact strength is high. The composition is easy to handle, and its storage stability is good. The composition comprises (a) an impact-resistant resinous complex composed of a (meth)acrylic polymer and core-shell structured polymer particles having at least one hard polymer layer, at least one soft polymer layer and an outermost hard polymer layer, wherein the impact-resistant resinous complex contains ionic components in an amount not larger than 0.05% by weight of the resinous composition, (b) (meth)acrylate monomer, and (c) a polymerization initiator.
    Type: Grant
    Filed: March 31, 1998
    Date of Patent: October 17, 2000
    Assignee: Kuraray Co., Ltd.
    Inventors: Kenji Hatanaka, Satoshi Yamaguchi, Mitsuo Otani
  • Patent number: 5451245
    Abstract: Acicular magnetic iron particles comprising acicular iron substrate particles having first layer consisting of at least one of hydrous oxides and anhydrous oxides of aluminum and zirconium and mixtures thereof and second layer consisting of hydrous oxides and anhydrous oxides of aluminum and mixtures thereof coated on the surfaces of the particles are produced by coating the surfaces of hydrated iron oxide particles as substrate with at least one of aluminum compounds and zirconium compounds, then heating the coated substrate particles to convert to hematite particles, thereafter coating the surfaces of the resultant hematite substrate particles with at least one of aluminum compounds, and then reducing under heat the coated hematite particles.
    Type: Grant
    Filed: March 4, 1994
    Date of Patent: September 19, 1995
    Assignee: Ishihara Sangyo Kaisha, Ltd.
    Inventors: Eiji Nomura, Toshihiko Kawamura, Kenji Hatanaka, Nariaki Moriyama
  • Patent number: 5034138
    Abstract: A method and apparatus for producing activated mineral water. Material water is pressurized by a pump and passed through a plurality of columns connected in series and filled with inorganic substances, so that the pressurized water is brought into contact with the inorganic substances while passing through the pipes. The water discharged from the pipes is aerated. The abovementioned cycle may be repeated a plurality of times.
    Type: Grant
    Filed: December 27, 1990
    Date of Patent: July 23, 1991
    Assignee: Shinki Sangyo Co., Ltd.
    Inventors: Kenji Hatanaka, Kanji Nakatani
  • Patent number: 4782806
    Abstract: A fuel injection system and method for injecting fuel into a chamber in an air intake manifold which is connected to plurality of engine cylinders by a plurality of branch passages. The fuel injection system controls separately an amount of fuel injected from an injector to each engine cylinder with configurations of the respective branch passages taken into account. That is to say, in the fuel injection system, at least one fuel injector is disposed so as to inject fuel into the chamber, timing of suction stroke of each engine cylinder is determined, and the amount of fuel supplied to each cylinder is set on the basis of the dimensions of the branch passage from the position of the fuel injector to a corresponding cylinder, and the amount of fuel injected through the fuel injector for each cylinder is calculated on the basis of the amount of fuel to be actually distributed to each cylinder.
    Type: Grant
    Filed: June 17, 1987
    Date of Patent: November 8, 1988
    Assignee: Nissan Motor Company, Limited
    Inventor: Kenji Hatanaka