Patents by Inventor Shinya Kitoh

Shinya Kitoh 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).

  • Ophthalmic composition
    Patent number: 5998488
    Abstract: In an ophthalmic solution comprising an antimicrobial preservative having a quaternary ammonium type cationic group, there are blended a cyclodextrin, EDTA or its salt, and boric acid and/or borax. The solution has an excellent antimicrobial activity and is effective for inhibiting the antimicrobial preservative from adsorbing to contact lenses. It can be instilled to eyes with contact lenses on.
    Type: Grant
    Filed: August 27, 1998
    Date of Patent: December 7, 1999
    Assignee: Lion Corporation
    Inventors: Takashi Shinohara, Yoshikazu Kubo, Shinya Kitoh
  • Self-hardenable material
    Patent number: 4959104
    Abstract: A self-hardenable material comprising a calcium phosphate having an atomic ratio of Ca/P of 1.4 to 1.6, a difficultly water-soluble inorganic fluoride, an organic or inorganic acid and water is provided. For example, when the hardenable material is frilled in the form of slurry or paste in a necessary part in vivo or in the dental cavity, it hardens within a short time to form a stable apatite type product.
    Type: Grant
    Filed: December 20, 1988
    Date of Patent: September 25, 1990
    Assignees: Mitsui Toatsu Chemicals, Inc., Lion Corporation
    Inventors: Shinji Iino, Minoru Oshima, Shinya Kitoh, Toshiaki Kobayashi
  • Dental adhesive composition
    Patent number: 4923400
    Abstract: A dental adhesive composition containing a compound having the formula (I): ##STR1##
    Type: Grant
    Filed: March 18, 1988
    Date of Patent: May 8, 1990
    Assignee: Lion Corporation
    Inventors: Kunitomo Suzuki, Takao Kiyohara, Shinya Kitoh
  • Dental filling material
    Patent number: 4394494
    Abstract: A dental filling material capable of forming a cured product with improved physical properties comprises a polymerizable monomer to be polymerized upon application, characterized in that the polymerizable monomer comprises a reaction product of two moles of a compound selected from the group consisting of hydroxyalkyl diacrylates and hydroxyalkyl dimethacrylates with on mole of an organic diisocyanate alone or in admixture with another polymerizable monomer. The reaction product may be bis(1,3-dimethacryloyloxy-2-propanetriyl)-N,N'-hexamethylene dicarbamate or bis(1,3-diacryloyloxy-2-propanetriyl)-N,N'-hexamethylene dicarbamate. The reaction product may be used in admixture with trimethylolpropane triacrylate and/or trimethacrylate and (mono-, di- or tri-)ethylene glycol diacrylate and/or dimethacrylate. The reaction product may also be used in admixture with bis-oxyethylenic bisphenol-A diacrylate and/or dimethacrylate and (mono-, di- or tri-)ethylene glycol diacrylate and/or dimethacrylate.
    Type: Grant
    Filed: June 22, 1981
    Date of Patent: July 19, 1983
    Assignee: Lion Corporation
    Inventors: Mikio Miyake, Shinya Kitoh, Satoshi Hayashi
  • N-(2-Hydroxy-3-methacryloyloxypropyl)-aminobenzoic acid derivatives and dental adhesive composition containing same
    Patent number: 4388421
    Abstract: Novel compounds used as polymerizable monomers in a dental adhesive composition, and having a general formula (1): ##STR1## wherein R.sup.2 is a carboxyl group and R.sup.3 is a hydrogen atom when R.sup.1 is a methyl group, and R.sup.2 is a hydroxyl group and R.sup.3 is a carboxyl group when R.sup.1 is a hydrogen atom, that is, N-methyl-N-(2-hydroxy-3-methacryloyloxypropyl)-m-aminobenzoic acid and 2-hydroxy-4-[(2-hydroxy-3-methacryloyloxypropyl)amino]benzoic acid are disclosed.
    Type: Grant
    Filed: December 14, 1981
    Date of Patent: June 14, 1983
    Assignee: Lion Corporation
    Inventors: Shin-ichi Suzuki, Shinya Kitoh, Haruhiko Toda, Moriaki Higo
  • 1-Methacryloxyethane-1,1-diphosphonic acid and its salts and dental adhesive composition containing same
    Patent number: 4383052
    Abstract: A novel compound, 1-methacryloxyethane-1,1-diphosphonic acid and its salts provide improved adhesion to tooth substances when used as a polymerizable monomer in a dental adhesive composition.
    Type: Grant
    Filed: December 14, 1981
    Date of Patent: May 10, 1983
    Assignee: Lion Corporation
    Inventors: Moriaki Higo, Yasuo Kikuchi, Shinya Kitoh, Shin-ichi Suzuki, Haruhiko Toda