Patents by Inventor Eiichi Terakawa
Eiichi Terakawa 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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Patent number: 9675527Abstract: The present invention provides a dental color tone adjustment material kit that has improved properties in terms of surface drying and of discoloration after curing and that enables adjustment to a desired color tone. The present invention relates to a dental color tone adjustment material kit including: a primer composition (A) including an acid group-containing polymerizable monomer (a) and a volatile organic solvent (b); and a dental color tone adjustment material B including a polymerizable monomer (d), a polymerization initiator (e), particle aggregates (f) that are chain aggregates of ultrafine filler particles having an average primary particle diameter of 1 to 50 nm, titanium dioxide (g), and a pigment (h). The monomer (a) accounts for 0.05 to 45 weight % of the primer composition (A), and the organic solvent (b) accounts for 55 to 99.95 weight % of the primer composition (A).Type: GrantFiled: October 28, 2014Date of Patent: June 13, 2017Assignee: KURARAY NORITAKE DENTAL INC.Inventors: Hirotaka Kita, Eiichi Terakawa, Mizuko Oshita
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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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Publication number: 20160250107Abstract: The present invention provides a dental color tone adjustment material kit that has improved properties in terms of surface drying and of discoloration after curing and that enables adjustment to a desired color tone. The present invention relates to a dental color tone adjustment material kit including: a primer composition (A) including an acid group-containing polymerizable monomer (a) and a volatile organic solvent (b); and a dental color tone adjustment material B including a polymerizable monomer (d), a polymerization initiator (e), particle aggregates (f) that are chain aggregates of ultrafine filler particles having an average primary particle diameter of 1 to 50 nm, titanium dioxide (g), and a pigment (h). The monomer (a) accounts for 0.05 to 45 weight % of the primer composition (A), and the organic solvent (b) accounts for 55 to 99.95 weight % of the primer composition (A).Type: ApplicationFiled: October 28, 2014Publication date: September 1, 2016Applicant: KURARAY NORITAKE DENTAL INC.Inventors: Hirotaka KITA, Eiichi TERAKAWA, Mizuko OSHITA
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Publication number: 20130134188Abstract: A cartridge-type dispenser has a cartridge main body with a filling space, an extrusion nozzle on the front, and a piston slidably disposed in the filling space. The piston extrudes contents of the filling space from the extrusion nozzle by applying a push-in force. The piston includes a trunk portion having an outer circumferential wall running along an inner wall of the main body with a gap therebetween, a front wall on one end of the trunk portion directly contacting the contents of the filling space, and a rear wall on the other end whereon a rod of a push-in tool applies the push-in force on the piston. On the outer circumferential wall of the trunk portion, protrusions are provided, which contact the inner circumferential wall of the main body. The points of contact form sliding parts of the piston but do not seal the main body interior.Type: ApplicationFiled: April 21, 2011Publication date: May 30, 2013Applicants: YOSHINO KOGYOSHO CO., LTD., KURARAY NORITAKE DENTAL INC.Inventors: Eiichi Terakawa, Taizo Nakao, Toru Toma
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Patent number: 8124669Abstract: A composition for dental use containing a polymerizable monomer (a) having an aromatic ring and a hydroxyl group, a polymerizable monomer (b) having an aromatic ring without having any hydroxyl groups, and a polymerizable monomer (c) other than the polymerizable monomers (a) and (b), wherein the composition for dental use contains the polymerizable monomers (a), (b), and (c) in an amount of from 10 to 30% by weight, from 50 to 70% by weight, and from 10 to 30% by weight, respectively, of all the polymerizable monomers. The composition for dental use of the present invention can be suitably used as a product capable of substituting a part or all of a natural tooth in the field of dental therapy.Type: GrantFiled: February 5, 2008Date of Patent: February 28, 2012Assignee: Kuraray Medical Inc.Inventors: Eiichi Terakawa, Akiko Ota, Takahiro Sekiguchi
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Publication number: 20110003267Abstract: A composition for dental use containing a polymerizable monomer (a) having an aromatic ring and a hydroxyl group, a polymerizable monomer (b) having an aromatic ring without having any hydroxyl groups, and a polymerizable monomer (c) other than the polymerizable monomers (a) and (b), wherein the composition for dental use contains the polymerizable monomers (a), (b), and (c) in an amount of from 10 to 30% by weight, from 50 to 70% by weight, and from 10 to 30% by weight, respectively, of all the polymerizable monomers. The composition for dental use of the present invention can be suitably used as a product capable of substituting a part or all of a natural tooth in the field of dental therapy.Type: ApplicationFiled: February 5, 2008Publication date: January 6, 2011Applicant: KURARAY MEDICAL INC.Inventors: Eiichi Terakawa, Akiko Ota, Takahiro Sekiguchi
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Patent number: 6458868Abstract: An organic phosphate compound having at least one radically polymerizable double bond, at least one phosphate residue having one or two hydroxyl groups, and at least one hydrocarbon group having 4 or more carbon atoms in a molecule, wherein a 10% by weight methanol solution of the organic phosphate compound has an electric conductivity at 25° C. of 0.5 mS/cm or less, and/or the organic phosphate compound has a light transmittance at 455 nm of 90% or more; a process for preparing the organic phosphate compound; a dental polymerizable composition comprising (a) the organic phosphate compound and (b) a polymerizable monomer capable of copolymerizing with the organic phosphate compound.Type: GrantFiled: November 30, 2000Date of Patent: October 1, 2002Assignee: Kuraray Co., Ltd.Inventors: Koichi Okada, Junichi Ohtsuki, Koji Takahashi, Yasuji Minami, Eiichi Terakawa, Miho Harada
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Patent number: D698446Type: GrantFiled: November 29, 2012Date of Patent: January 28, 2014Assignee: Kuraray Noritake Dental Inc.Inventor: Eiichi Terakawa
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Patent number: D710505Type: GrantFiled: November 29, 2012Date of Patent: August 5, 2014Assignee: Kuraray Noritake Dental Inc.Inventor: Eiichi Terakawa
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Patent number: D737982Type: GrantFiled: March 25, 2014Date of Patent: September 1, 2015Assignee: Kuraray Noritake Dental Inc.Inventor: Eiichi Terakawa
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Patent number: D737983Type: GrantFiled: March 25, 2014Date of Patent: September 1, 2015Assignee: Kuraray Noritake Dental Inc.Inventor: Eiichi Terakawa
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Patent number: D737984Type: GrantFiled: March 25, 2014Date of Patent: September 1, 2015Assignee: Kuraray Noritake Dental Inc.Inventor: Eiichi Terakawa