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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Publication number: 20230028313Abstract: A zirconia powder is provided comprising a yttria source and zirconia, wherein a content of the yttria source is 4.5 mol % or more and 6.5 mol % or less and the remainder is zirconia, a ratio of a total of tetragonal and cubic crystals to an entire crystal phase of zirconia is 90% or less, a BET specific surface area is 7.5 m2/g or more and 15 m2/g or less, and an average crystallite size is 325 ? or greater. The powders are useful in producing sintered bodies having the mechanical strength and the translucency desired for use in dental prosthetic materials, and precursors thereof.Type: ApplicationFiled: September 14, 2022Publication date: January 26, 2023Applicant: TOSOH CORPORATIONInventors: Akiko ITO, Ayako WATANABE, Sho AZECHI, Hitoshi NAGAYAMA, Hiroyuki FUJISAKI
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Publication number: 20230014792Abstract: To provide a sintered body with improved impact resistance due to impact absorption through plastic deformation before brittle fracture for an impact exceeding the fracture resistance of the sintered body, and/or a method for producing the sintered body. A sintered body including: zirconia containing a stabilizer; and a region in which an impact mark is formed when an impact force is applied.Type: ApplicationFiled: December 8, 2020Publication date: January 19, 2023Applicant: TOSOH CORPORATIONInventors: Taku FUKIAGE, Hitoshi NAGAYAMA, Kenta KAWAMURA, Takashi TSUKIMORI, Hiroyuki FUJISAKI
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Patent number: 11548825Abstract: Provided is at least any of a layered body, which has a change in texture derived from zirconia, particularly a change in translucency and is suitable as a dental prosthetic member, a precursor thereof, or a method for producing these. There is provided a layered body having a structure in which two or more layers containing zirconia containing a stabilizer are layered, the layered body including at least: a first layer containing zirconia having a stabilizer content of higher than or equal to 4 mol %; and a second layer containing zirconia having a stabilizer content different from that of the zirconia contained in the first layer.Type: GrantFiled: February 26, 2020Date of Patent: January 10, 2023Assignee: TOSOH CORPORATIONInventors: Yuki Ushio, Akiko Ito, Sho Azechi, Hiroyuki Fujisaki
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Patent number: 11542201Abstract: There is provided at least any of a layered body which has a change in color tone and in which it is unnecessary to select a colorant and the content of the colorant in consideration of a difference in the sintering behavior between layers, a precursor thereof, or a method for producing these. Provided is a layered body which has a structure, in which two or more layers containing stabilizer-containing zirconia and a colorant are layered, and in which types and contents of the colorants contained in the layers are equal to each other, the layered body including at least: a first layer containing a colorant and zirconia which has a stabilizer content of higher than or equal to 3.3 mol %; and a second layer containing a colorant and zirconia which has a stabilizer content different from that of the zirconia contained in the first layer.Type: GrantFiled: February 26, 2020Date of Patent: January 3, 2023Assignee: TOSOH CORPORATIONInventors: Yuki Ushio, Yuuki Ito, Sho Azechi, Hiroyuki Fujisaki
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Patent number: 11511134Abstract: A particle therapy system includes a building having a first floor and second floors and, a particle beam generator installed on the first floor and configured to generate a particle beam, a first transport system configured to transport a particle beam from the particle beam generator to a first irradiation system in a first treatment room, and a second transport system configured to transport a particle beam to a second irradiation system in a second treatment room, branched from the first transport system, via a second floor. The second transport system has a first bending magnet that bends a particle beam to the direction of the second floor different from the installation surface of the particle beam generator. The building has a shielding wall configured to shield the first floor and the second floor and the second transport system is provided penetrating the shielding wall.Type: GrantFiled: May 15, 2019Date of Patent: November 29, 2022Assignee: HITACHI, LTD.Inventors: Hideaki Nishiuchi, Hiroyuki Satake, Yui Shinozawa, Yujiro Fujisaki
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Patent number: 11515167Abstract: Provided is a plasma etching method which enables etching with high accuracy while controlling and reducing surface roughness of a transition metal film. The etching is performed for the transition metal film, which is formed on a sample and contains a transition metal element, by a first step of isotropically generating a layer of transition metal oxide on a surface of the transition metal film while a temperature of the sample is maintained at 100° C. or lower, a second step of raising the temperature of the sample to a predetermined temperature of 150° C. or higher and 250° C. or lower while a complexation gas is supplied to the layer of transition metal oxide, a third step of subliming and removing a reactant generated by an reaction between the complexation gas and the transition metal oxide formed in the first step while the temperature of the sample is maintained at 150° C. or higher and 250° C. or lower, and a fourth step of cooling the sample.Type: GrantFiled: February 1, 2019Date of Patent: November 29, 2022Assignee: HITACHI HIGH-TECH CORPORATIONInventors: Sumiko Fujisaki, Yoshihide Yamaguchi, Hiroyuki Kobayashi, Kazunori Shinoda, Kohei Kawamura, Yutaka Kouzuma, Masaru Izawa
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Patent number: 11479511Abstract: A zirconia sintered body is provided and includes yttria and zirconia, containing yttria by a content ranging from 4.5 mol % or more to 6.5 mol % or less and zirconia as the remainder, the total light transmittance of a 1-mm thick sample measured in compliance with JIS K 7361-1 being 46.5% or higher, the three-point bending strength being 700 MPa or higher, and a ratio of an integrated value for the total light transmittance to an integrated value for the parallel light transmittance of a 1-mm thick sample measured at the measurement wavelength ranging from 400 to 700 nm being 1.3% or less.Type: GrantFiled: September 30, 2020Date of Patent: October 25, 2022Assignee: TOSOH CORPORATIONInventors: Akiko Ito, Ayako Watanabe, Sho Azechi, Hitoshi Nagayama, Hiroyuki Fujisaki
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Publication number: 20210403387Abstract: A complex sintered body includes a lamination of a layer composed of a zirconia sintered body containing 0.5% or more by mole and less than 4% by mole of an oxide of cerium in terms of CeO2, 2% or more by mole and less than 6% by mole of yttria and 0.1% or more by mass and less than 2% by mass of an oxide of aluminum; and at least one of a layer composed of a zirconia-based sintered body containing 2.0% or more by mass and 20.0% or less by mass of an oxide of aluminum, and a layer composed of a zirconia-based sintered body containing 2% or more by mole and less than 6% by mole of yttria and a coloring agent.Type: ApplicationFiled: August 7, 2019Publication date: December 30, 2021Applicant: TOSOH CORPORATIONInventors: Satoshi TSUCHIYA, Hiroyuki FUJISAKI, Hitoshi NAGAYAMA
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Patent number: 11124457Abstract: A zirconia sintered body comprising 3.0 wt % or more and 30.0 wt % or less of aluminum in terms of Al2O3 and a remainder is zirconia containing 2 mol % or more and 4 mol % or less of erbia, in which the zirconia sintered body includes grains of aluminum oxide, and a total light transmittance with respect to a D65 light source at a sample thickness of 1.0 mm is 10% or less.Type: GrantFiled: February 14, 2020Date of Patent: September 21, 2021Assignee: TOSOH CORPORATIONInventors: Hitoshi Nagayama, Hajime Funakoshi, Hiroyuki Fujisaki, Takashi Tsukimori
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Publication number: 20210246075Abstract: A method for manufacturing a zirconia sintered body includes molding a powder composition that has a yttria content of more than 3% by mole and 5.2% by mole or less and that contains a first zirconia powder having a yttria content of 2% by mole or more and 4% by mole or less and a second zirconia powder having a yttria content of more than 4% by mole and 6% by mole or less to obtain a green body, and sintering the green body to obtain a sintered body.Type: ApplicationFiled: April 27, 2021Publication date: August 12, 2021Applicant: TOSOH CORPORATIONInventors: Kiyotaka KAWAMURA, Akiko ITO, Hiroyuki FUJISAKI, Sho AZECHI
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Patent number: 11021401Abstract: Provided are a zirconia sintered body capable of being widely used as a dental material, in particular, a zirconia sintered body capable of being applied to both a dental material for a back tooth and a dental material for a front tooth and a simple and easy method for manufacturing the zirconia sintered body. The method for manufacturing a zirconia sintered body includes a molding step of molding a powder composition that has an yttria content of more than 3% by mole and 5.2% by mole or less and that contains a first zirconia powder having an yttria content of 2% by mole or more and 4% by mole or less and a second zirconia powder having an yttria content of more than 4% by mole and 6% by mole or less to obtain a green body, and a sintering step of sintering the green body to obtain a sintered body.Type: GrantFiled: March 19, 2018Date of Patent: June 1, 2021Assignee: TOSOH CORPORATIONInventors: Kiyotaka Kawamura, Akiko Ito, Hiroyuki Fujisaki, Sho Azechi
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Publication number: 20210101838Abstract: A zirconia sintered body is provided and includes yttria and zirconia, containing yttria by a content ranging from 4.5 mol % or more to 6.5 mol % or less and zirconia as the remainder, the total light transmittance of a 1-mm thick sample measured in compliance with JIS K 7361-1 being 46.5% or higher, the three-point bending strength being 700 MPa or higher, and a ratio of an integrated value for the total light transmittance to an integrated value for the parallel light transmittance of a 1-mm thick sample measured at the measurement wavelength ranging from 400 to 700 nm being 1.3% or less.Type: ApplicationFiled: September 30, 2020Publication date: April 8, 2021Applicant: TOSOH CORPORATIONInventors: Akiko ITO, Ayako WATANABE, Sho AZECHI, Hitoshi NAGAYAMA, Hiroyuki FUJISAKI
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Patent number: 10858293Abstract: 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: GrantFiled: March 29, 2019Date of Patent: December 8, 2020Assignee: TOSOH CORPORATIONInventors: Hitoshi Nagayama, Hajime Funakoshi, Hiroyuki Fujisaki
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Publication number: 20200283343Abstract: Provided is at least any of a layered body, which has a change in texture derived from zirconia, particularly a change in translucency and is suitable as a dental prosthetic member, a precursor thereof, or a method for producing these. There is provided a layered body having a structure in which two or more layers containing zirconia containing a stabilizer are layered, the layered body including at least: a first layer containing zirconia having a stabilizer content of higher than or equal to 4 mol %; and a second layer containing zirconia having a stabilizer content different from that of the zirconia contained in the first layer.Type: ApplicationFiled: February 26, 2020Publication date: September 10, 2020Applicant: TOSOH CORPORATIONInventors: Yuki USHIO, Akiko ITO, Sho AZECHI, Hiroyuki FUJISAKI
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Publication number: 20200283341Abstract: There is provided at least any of a layered body which has a change in color tone and in which it is unnecessary to select a colorant and the content of the colorant in consideration of a difference in the sintering behavior between layers, a precursor thereof, or a method for producing these. Provided is a layered body which has a structure, in which two or more layers containing stabilizer-containing zirconia and a colorant are layered, and in which types and contents of the colorants contained in the layers are equal to each other, the layered body including at least: a first layer containing a colorant and zirconia which has a stabilizer content of higher than or equal to 3.3 mol %; and a second layer containing a colorant and zirconia which has a stabilizer content different from that of the zirconia contained in the first layer.Type: ApplicationFiled: February 26, 2020Publication date: September 10, 2020Applicant: TOSOH CORPORATIONInventors: Yuki USHIO, Yuuki ITO, Sho AZECHI, Hiroyuki FUJISAKI
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Publication number: 20200262759Abstract: A zirconia sintered body comprising 3.0 wt % or more and 30.0 wt % or less of aluminum in terms of Al2O3 and a remainder is zirconia containing 2 mol % or more and 4 mol % or less of erbia, in which the zirconia sintered body includes grains of aluminum oxide, and a total light transmittance with respect to a D65 light source at a sample thickness of 1.0 mm is 10% or less.Type: ApplicationFiled: February 14, 2020Publication date: August 20, 2020Applicant: TOSOH CORPORATIONInventors: Hitoshi NAGAYAMA, Hajime FUNAKOSHI, Hiroyuki FUJISAKI, Takashi TSUKIMORI
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Publication number: 20200223756Abstract: Provided are a zirconia sintered body capable of being widely used as a dental material, in particular, a zirconia sintered body capable of being applied to both a dental material for a back tooth and a dental material for a front tooth and a simple and easy method for manufacturing the zirconia sintered body. The method for manufacturing a zirconia sintered body includes a molding step of molding a powder composition that has an yttria content of more than 3% by mole and 5.2% by mole or less and that contains a first zirconia powder having an yttria content of 2% by mole or more and 4% by mole or less and a second zirconia powder having an yttria content of more than 4% by mole and 6% by mole or less to obtain a green body, and a sintering step of sintering the green body to obtain a sintered body.Type: ApplicationFiled: March 19, 2018Publication date: July 16, 2020Applicant: TOSOH CORPORATIONInventors: Kiyotaka KAWAMURA, Akiko ITO, Hiroyuki FUJISAKI, Sho AZECHI
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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