Patents by Inventor Hiroyuki Fujisaki
Hiroyuki Fujisaki 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: 10555795Abstract: A zirconia sintered body is provided having a color tone equivalent to the color tone guides of various natural teeth and having the same aesthetics as a natural front tooth. The present invention provides a colored translucent zirconia sintered body comprising zirconia containing greater than 4.0 mol % and not greater than 6.5 mol % of yttria, less than 0.25 mol % of erbia, less than 2,000 ppm of iron oxide in terms of Fe2O3, less than 0.01 wt. % of cobalt oxide in terms of CoO, and less than 0.1 wt. % of alumina; the zirconia sintered body having a relative density of not less than 99.90%, a total light transmittance of not less than 25% and less than 40% for light having a wavelength of 600 nm at a sample thickness of 1.0 mm, and a strength of not less than 500 MPa.Type: GrantFiled: April 3, 2018Date of Patent: February 11, 2020Assignee: TOSOH CORPORATIONInventors: Hiroyuki Fujisaki, Kiyotaka Kawamura
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Publication number: 20190300438Abstract: A zirconia sintered body contains aluminum, cobalt, and manganese and a remaining portion consisting of yttria-containing zirconia. In an oxide exchange, aluminum content is 5.0 wt % or more and 30.0 wt % or less, cobalt content is 0.1 wt % or more and 2.0 wt % or less, and manganese content is 0.5 wt % or more and 7.0 wt % or less.Type: ApplicationFiled: March 29, 2019Publication date: October 3, 2019Applicant: TOSOH CORPORATIONInventors: Hitoshi NAGAYAMA, Hajime FUNAKOSHI, Hiroyuki FUJISAKI
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Publication number: 20180221120Abstract: A zirconia sintered body is provided having a color tone equivalent to the color tone guides of various natural teeth and having the same aesthetics as a natural front tooth. The present invention provides a colored translucent zirconia sintered body comprising zirconia containing greater than 4.0 mol % and not greater than 6.5 mol % of yttria, less than 0.25 mol % of erbia, less than 2,000 ppm of iron oxide in terms of Fe2O3, less than 0.01 wt. % of cobalt oxide in terms of CoO, and less than 0.1 wt. % of alumina; the zirconia sintered body having a relative density of not less than 99.90%, a total light transmittance of not less than 25% and less than 40% for light having a wavelength of 600 nm at a sample thickness of 1.0 mm, and a strength of not less than 500 MPa.Type: ApplicationFiled: April 3, 2018Publication date: August 9, 2018Applicant: TOSOH CORPORATIONInventors: Hiroyuki FUJISAKI, Kiyotaka KAWAMURA
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Patent number: 9962247Abstract: A zirconia sintered body is provided having a color tone equivalent to the color tone guides of various natural teeth and having the same aesthetics as a natural front tooth. The present invention provides a colored translucent zirconia sintered body comprising zirconia containing greater than 4.0 mol % and not greater than 6.5 mol % of yttria, less than 0.25 mol % of erbia, less than 2,000 ppm of iron oxide in terms of Fe2O3, less than 0.01 wt. % of cobalt oxide in terms of CoO, and less than 0.1 wt. % of alumina; the zirconia sintered body having a relative density of not less than 99.90%, a total light transmittance of not less than 25% and less than 40% for light having a wavelength of 600 nm at a sample thickness of 1.0 mm, and a strength of not less than 500 MPa.Type: GrantFiled: June 22, 2015Date of Patent: May 8, 2018Assignee: TOSOH CORPORATIONInventors: Hiroyuki Fujisaki, Kiyotaka Kawamura
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Patent number: 9737383Abstract: To provide a zirconia sintered body having both excellent translucency and bending strength, specifically a zirconia sintered body having both translucency and strength suitable as a denture for front tooth, and a process for its production. A translucent zirconia sintered body containing more than 4.0 mol % and at most 6.5 mol % of yttria and less than 0.1 wt % of alumina, and having a relative density of at least 99.82%, a total light transmittance of at least 37% and less than 40% to light with a wavelength of 600 nm at a thickness of 1.0 mm, and a bending strength of at least 500 MPa, and a process for its production.Type: GrantFiled: December 19, 2014Date of Patent: August 22, 2017Assignee: TOSOH CORPORATIONInventors: Hiroyuki Fujisaki, Kiyotaka Kawamura
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Publication number: 20170143458Abstract: A zirconia sintered body is provided having a color tone equivalent to the color tone guides of various natural teeth and having the same aesthetics as a natural front tooth. The present invention provides a colored translucent zirconia sintered body comprising zirconia containing greater than 4.0 mol % and not greater than 6.5 mol % of yttria, less than 0.25 mol % of erbia, less than 2,000 ppm of iron oxide in terms of Fe2O3, less than 0.01 wt. % of cobalt oxide in terms of CoO, and less than 0.1 wt. % of alumina; the zirconia sintered body having a relative density of not less than 99.90%, a total light transmittance of not less than 25% and less than 40% for light having a wavelength of 600 nm at a sample thickness of 1.0 mm, and a strength of not less than 500 MPa.Type: ApplicationFiled: June 22, 2015Publication date: May 25, 2017Applicant: TOSOH CORPORATIONInventors: Hiroyuki FUJISAKI, Kiyotaka KAWAMURA
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Publication number: 20160310245Abstract: To provide a zirconia sintered body having both excellent translucency and bending strength, specifically a zirconia sintered body having both translucency and strength suitable as a denture for front tooth, and a process for its production. A translucent zirconia sintered body containing more than 4.0 mol % and at most 6.5 mol % of yttria and less than 0.1 wt % of alumina, and having a relative density of at least 99.82%, a total light transmittance of at least 37% and less than 40% to light with a wavelength of 600 nm at a thickness of 1.0 mm, and a bending strength of at least 500 MPa, and a process for its production.Type: ApplicationFiled: December 19, 2014Publication date: October 27, 2016Applicant: TOSOH CORPORATIONInventors: Hiroyuki FUJISAKI, Kiyotaka KAWAMURA
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Patent number: 9428422Abstract: A pink-colored zirconia sintered body has a high sintered body density and strength, and a colored translucency, which has a color tone similar to teeth and excellent translucency and has high aesthetic properties. A colored translucent zirconia sintered body includes from 2 to 4 mol % of yttria, from 0.02 to 0.8 mol % of Er2O3, at least 20 and less than 2,000 ppm, as calculated as Fe2O3, of an iron compound, at least 0.005 and less than 0.2 wt % of Al2O3 and the rest being zirconia, and having a lightness L* of from 55 to 75, a* of from 0 to 10 and b* of from 0 to 30 as chromatic parameters stipulated in JIS-Z8729, has a relative density of at least 99.80% and has a total light transmittance of at least 18% and at most 40% as measured at a sample thickness of 1 mm using a D65 light source.Type: GrantFiled: December 26, 2013Date of Patent: August 30, 2016Assignee: TOSOH CORPORATIONInventors: Kiyotaka Kawamura, Hiroyuki Fujisaki
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Patent number: 9309157Abstract: A subject of the invention relates to providing a powder for a translucent zirconia sintered body which is necessary for the production of a zirconia sintered body having a high sintered-body density and high strength and giving an excellent sense of translucency, without conducting any special sintering, such as HIP sintering. The invention relates to a technique for obtaining, through normal-pressure sintering, a translucent zirconia sintered body characterized by comprising zirconia which contains 2-4 mol % yttria as a stabilizer and has an alumina content of 0.2 wt % or lower, and by having a relative density of 99.8% or higher and a total light transmittance, as measured at a thickness of 1.0 mm, of 35% or higher. It is preferred that a powder containing 0-0.2 wt % alumina with a particle diameter of 0.01-0.5 ?m, having a BET specific surface area of 5-16 m2/g and an average particle diameter of 0.3-0.7 ?m, and having a rate of sintering shrinkage in normal-pressure sintering (??/?T; g/cm3·° C.) of 0.Type: GrantFiled: August 29, 2014Date of Patent: April 12, 2016Assignee: TOSOH CORPORATIONInventors: Hiroyuki Fujisaki, Kiyotaka Kawamura, Kohei Imai
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Patent number: 9249056Abstract: A zirconia sintered body having not only high strength but also excellent aesthetic properties. A colored translucent zirconia sintered body, characterized by containing an iron compound and from 2 to 4 mol % of yttria, showing a lightness L* of from 51 to 80 in L*a*b* color system, and having a relative density of at least 99.80%. The colored zirconia sintered body preferably has a total light transmittance of at least 20% as measured at a sample thickness of 1 mm and with a D65 light source. The colored translucent zirconia sintered body has aesthetic properties equivalent to those of natural teeth and is particularly suitable for a zirconia sintered body to be used for dental applications, and further, suitable for a mill blank such as an artificial tooth material or the like, and an orthodontic bracket.Type: GrantFiled: July 27, 2012Date of Patent: February 2, 2016Assignee: TOSOH CORPORATIONInventors: Hiroyuki Fujisaki, Kiyotaka Kawamura, Kohei Imai
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Publication number: 20150315086Abstract: A pink-colored zirconia sintered body has a high sintered body density and strength, and a colored translucency, which has a color tone similar to teeth and excellent translucency and has high aesthetic properties. A colored translucent zirconia sintered body includes from 2 to 4 mol % of yttria, from 0.02 to 0.8 mol % of Er2O3, at least 20 and less than 2,000 ppm, as calculated as Fe2O3, of an iron compound, at least 0.005 and less than 0.2 wt % of Al2O3 and the rest being zirconia, and having a lightness L* of from 55 to 75, a* of from 0 to 10 and b* of from 0 to 30 as chromatic parameters stipulated in JIS-Z8729, has a relative density of at least 99.80% and has a total light transmittance of at least 18% and at most 40% as measured at a sample thickness of 1 mm using a D65 light source.Type: ApplicationFiled: December 26, 2013Publication date: November 5, 2015Applicant: TOSOH CORPORATIONInventors: Kiyotaka KAWAMURA, Hiroyuki FUJISAKI
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Publication number: 20140370453Abstract: A subject of the invention relates to providing a powder for a translucent zirconia sintered body which is necessary for the production of a zirconia sintered body having a high sintered-body density and high strength and giving an excellent sense of translucency, without conducting any special sintering, such as HIP sintering. The invention relates to a technique for obtaining, through normal-pressure sintering, a translucent zirconia sintered body characterized by comprising zirconia which contains 2-4 mol % yttria as a stabilizer and has an alumina content of 0.2 wt % or lower, and by having a relative density of 99.8% or higher and a total light transmittance, as measured at a thickness of 1.0 mm, of 35% or higher. It is preferred that a powder containing 0-0.2 wt % alumina with a particle diameter of 0.01-0.5 ?m, having a BET specific surface area of 5-16 m2/g and an average particle diameter of 0.3-0.7 ?m, and having a rate of sintering shrinkage in normal-pressure sintering (??/?T; g/cm3·° C.) of 0.Type: ApplicationFiled: August 29, 2014Publication date: December 18, 2014Applicant: TOSOH CORPORATIONInventors: Hiroyuki Fujisaki, Kiyotaka Kawamura, Kohei Imai
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Publication number: 20140227654Abstract: A zirconia sintered body having not only high strength but also excellent aesthetic properties. A colored translucent zirconia sintered body, characterized by containing an iron compound and from 2 to 4 mol % of yttria, showing a lightness L* of from 51 to 80 in L*a*b* color system, and having a relative density of at least 99.80%. The colored zirconia sintered body preferably has a total light transmittance of at least 20% as measured at a sample thickness of 1 mm and with a D65 light source. The colored translucent zirconia sintered body has aesthetic properties equivalent to those of natural teeth and is particularly suitable for a zirconia sintered body to be used for dental applications, and further, suitable for a mill blank such as an artificial tooth material or the like, and an orthodontic bracket.Type: ApplicationFiled: July 27, 2012Publication date: August 14, 2014Applicant: TOSOH CORPORATIONInventors: Hiroyuki Fujisaki, Kiyotaka Kawamura, Kohei Imai
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Publication number: 20110027742Abstract: A subject of the invention relates to providing a powder for a translucent zirconia sintered body which is necessary for the production of a zirconia sintered body having a high sintered-body density and high strength and giving an excellent sense of translucency, without conducting any special sintering, such as HIP sintering. The invention relates to a technique for obtaining, through normal-pressure sintering, a translucent zirconia sintered body characterized by comprising zirconia which contains 2-4 mol % yttria as a stabilizer and has an alumina content of 0.2 wt % or lower, and by having a relative density of 99.8% or higher and a total light transmittance, as measured at a thickness of 1.0 mm, of 35% or higher. It is preferred that a powder containing 0-0.2 wt % alumina with a particle diameter of 0.01-0.5 ?m, having a BET specific surface area of 5-16 m2/g and an average particle diameter of 0.3-0.7 ?m, and having a rate of sintering shrinkage in normal-pressure sintering (??/?T; g/cm3·° C.) of 0.Type: ApplicationFiled: April 8, 2009Publication date: February 3, 2011Applicant: TOSOH CORPORATIONInventors: Hiroyuki Fujisaki, Kiyotaka Kawamura, Kohei Imai
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Patent number: 7553789Abstract: A zirconia-containing powder including 2 to 6 weight % of a pigment which has a spinel structure represented by the chemical formula (Co1-xZnx)(Fe1-yAly)2O4(0?x?0.5, 0<y?0.5) or which is a coprecipitated material containing Co, Zn, Fe, and Al and has the same spinel structure after calcination, 0.05 to 6 weight % of Al2O3, and 3.60 to 7.10 weight % of Y2O3; and a black zirconia sintered body obtained by sintering the zirconia-containing powder within a temperature range of 1300 to 1500° C.Type: GrantFiled: May 14, 2007Date of Patent: June 30, 2009Assignee: Tosoh CorporationInventor: Hiroyuki Fujisaki
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Publication number: 20070270304Abstract: A zirconia-containing powder including 2 to 6 weight % of a pigment which has a spinel structure represented by the chemical formula (Co1-xZnx)(Fe1-yAly)2O4(0?x?0.5, 0<y?0.5) or which is a coprecipitated material containing Co, Zn, Fe, and Al and has the same spinel structure after calcination, 0.05 to 6 weight % of Al2O3, and 3.60 to 7.10 weight % of Y2O3; and a black zirconia sintered body obtained by sintering the zirconia-containing powder within a temperature range of 1300 to 1500° C.Type: ApplicationFiled: May 14, 2007Publication date: November 22, 2007Applicant: TOSOH CORPORATIONInventor: Hiroyuki FUJISAKI
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Patent number: 6818195Abstract: A combustion catalyst for removing organic compounds from a gas stream containing the same and a process for removing organic compounds from the gas stream using the catalyst are disclosed. The combustion catalyst comprises a first catalyst comprising a metal oxide containing at least one of the elements of the platinum group, and a second catalyst comprising a mixture of zeolite with a metal oxide containing at least one of the elements of the platinum group, in a manner such that the organic compounds are contacted first with the first catalyst and then with the second catalyst, whereby the organic compounds can be efficiently removed at a low temperature.Type: GrantFiled: February 7, 2001Date of Patent: November 16, 2004Assignee: Tosoh CorporationInventors: Hiroyuki Fujisaki, Wataru Kobayashi, Masao Nakano
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Publication number: 20010016185Abstract: A combustion catalyst for removing organic compounds from a gas stream containing the same and a process for removing organic compounds from the gas stream using the catalyst are disclosed. The combustion catalyst comprises a first catalyst comprising a metal oxide containing at least one of the elements of the platinum group, and a second catalyst comprising a mixture of zeolite with a metal oxide containing at least one of the elements of the platinum group, in a manner such that the organic compounds are contacted first with the first catalyst and then with the second catalyst, whereby the organic compounds can be efficiently removed at a low temperature.Type: ApplicationFiled: February 7, 2001Publication date: August 23, 2001Applicant: TOSOH CORPORATIONInventors: Hiroyuki Fujisaki, Wataru Kobayashi, Masao Nakano