Patents by Inventor Michiya Kawana
Michiya Kawana 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).
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Patent number: 9993394Abstract: Provided is a dental restorative composition that has good handling properties when in the form of a paste having yet to be cured and that has light diffusion ability and transparency when in the form of a cured product. The dental restorative composition includes a polymerizable monomer, a polymerization initiator, an inorganic filler (C) having an average particle diameter of 0.1 to 1 ?m, an organic-inorganic composite filler (D) having an average particle diameter of 1 ?m or more and less than 10 ?m, and an organic-inorganic composite filler (E) having an average particle diameter of 10 to 50 ?m. An absolute value of a difference between a refractive index (Cd) of the inorganic filler (C) and a refractive index (Ad) of a polymer of the polymerizable monomer is 0.01 or less, an absolute value of a difference between the refractive index (Ad) and one of a refractive index (Dd) of the organic-inorganic composite filler (D) and a refractive index (Ed) of the organic-inorganic composite filler (E) is 0.Type: GrantFiled: February 17, 2015Date of Patent: June 12, 2018Assignee: KURARAY NORITAKE DENTAL INC.Inventors: Hirotaka Kita, Michiya Kawana, Eiichi Terakawa
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Publication number: 20170049665Abstract: Provided is a dental restorative composition that has good handling properties when in the form of a paste having yet to be cured and that has light diffusion ability and transparency when in the form of a cured product. The dental restorative composition includes a polymerizable monomer, a polymerization initiator, an inorganic filler (C) having an average particle diameter of 0.1 to 1 ?m, an organic-inorganic composite filler (D) having an average particle diameter of 1 ?m or more and less than 10 ?m, and an organic-inorganic composite filler (E) having an average particle diameter of 10 to 50 ?m. An absolute value of a difference between a refractive index (Cd) of the inorganic filler (C) and a refractive index (Ad) of a polymer of the polymerizable monomer is 0.01 or less, an absolute value of a difference between the refractive index (Ad) and one of a refractive index (Dd) of the organic-inorganic composite filler (D) and a refractive index (Ed) of the organic-inorganic composite filler (E) is 0.Type: ApplicationFiled: February 17, 2015Publication date: February 23, 2017Applicant: KURARAY NORITAKE DENTAL INC.Inventors: Hirotaka KITA, Michiya KAWANA, Eiichi TERAKAWA
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Patent number: 9089482Abstract: The present invention provides a dental mill blank having excellent mechanical strength and having gloss retention high enough to maintain the gloss similar to that of natural teeth in an oral cavity for a long period of time. The present invention is a dental mill blank made of a cured product of a curable composition containing: a polymerizable monomer (A); and a spherical inorganic filler (B) having an average primary particle size of not less than 0.1 ?m and less than 1 ?m.Type: GrantFiled: September 30, 2011Date of Patent: July 28, 2015Assignee: KURARAY NORITAKE DENTAL INC.Inventors: Yusuke Takahata, Michiya Kawana
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Patent number: 8703840Abstract: The present invention provides a dental adhesive material kit having excellent bond durability. The present invention is represented by a dental adhesive material kit containing a dental aqueous adhesive composition (A) and a multi-part type dental nonaqueous curable composition (B). The dental aqueous adhesive composition (A) contains a polymerizable monomer (a) having an acidic group, an aliphatic polymerizable monomer (b) having no acidic group, water (c), and an amine-based reducing agent (d1) containing no sulfur atom. The multi-part type dental nonaqueous curable composition (B) contains an aliphatic polymerizable monomer (b) having no acidic group, an aromatic polymerizable monomer (e) having no acidic group, a powdery water-soluble reducing compound (f) containing a sulfur atom, an organic peroxide (g), and an amine-based reducing agent (d2) containing no sulfur atom.Type: GrantFiled: March 25, 2011Date of Patent: April 22, 2014Assignee: Kuraray Noritake Dental Inc.Inventors: Michiya Kawana, Hidemi Nakayama, Mitsuru Takei, Kenji Suzuki, Ai Hinamoto
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Publication number: 20130172441Abstract: The present invention provides a dental mill blank having excellent mechanical strength and having gloss retention high enough to maintain the gloss similar to that of natural teeth in an oral cavity for a long period of time. The present invention is a dental mill blank made of a cured product of a curable composition containing: a polymerizable monomer (A); and a spherical inorganic filler (B) having an average primary particle size of not less than 0.1 ?m and less than 1 ?m.Type: ApplicationFiled: September 30, 2011Publication date: July 4, 2013Applicant: KURARAY NORITAKE DENTAL INC.Inventors: Yusuke Takahata, Michiya Kawana
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Publication number: 20120202913Abstract: The present invention provides a dental adhesive material kit having excellent bond durability. The present invention is represented by a dental adhesive material kit containing a dental aqueous adhesive composition (A) and a multi-part type dental nonaqueous curable composition (B). The dental aqueous adhesive composition (A) contains a polymerizable monomer (a) having an acidic group, an aliphatic polymerizable monomer (b) having no acidic group, water (c), and an amine-based reducing agent (d1) containing no sulfur atom. The multi-part type dental nonaqueous curable composition (B) contains an aliphatic polymerizable monomer (b) having no acidic group, an aromatic polymerizable monomer (e) having no acidic group, a powdery water-soluble reducing compound (f) containing a sulfur atom, an organic peroxide (g), and an amine-based reducing agent (d2) containing no sulfur atom.Type: ApplicationFiled: March 25, 2011Publication date: August 9, 2012Applicant: KURARAY MEDICAL INC.Inventors: Michiya Kawana, Hidemi Nakayama, Mitsuru Takei, Kenji Suzuki, Ai Hinamoto