Patents by Inventor Toshio Tsujimoto
Toshio Tsujimoto 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: 20240116031Abstract: An object of the present invention is to provide a catalyst that enables production of an unsaturated carboxylic acid and/or unsaturated carboxylic acid ester represented by methyl methacrylate with high selectivity. The object is achieved by a catalyst including: one or more elements selected from boron, magnesium, zirconium, hafnium, and titanium; one or more elements selected from alkali metal elements; and silica; the catalyst having a peak height ratio I2/I1 of 0 to 1.2, wherein I1 represents the peak height at 417±10 cm?1, and I2 represents the peak height at 1050±10 cm?1, as obtained by Raman spectroscopy.Type: ApplicationFiled: November 30, 2023Publication date: April 11, 2024Applicant: Mitsubishi Chemical CorporationInventors: Akio Hayashi, Yuuki Tsujimoto, Toshio Hasegawa, Kazufumi Nishida, Masaya Fujisue, Wataru Ninomiya
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Patent number: 7993454Abstract: A surface modified quartz glass crucible and a process for modifying the crucible includes a layer of a metal oxide on the whole or a part of the inside and/or outside of the crucible, and baking it. At least an inside surface of the crucible is coated with a said metal oxide of magnesium, calcium, strontium or barium. The coated layer of the crucible does not abrade easily and provides a high dislocation free ratio of silicon single crystals pulled by using the crucible.Type: GrantFiled: March 3, 2010Date of Patent: August 9, 2011Assignee: Japan Super Quartz CorporationInventors: Toshio Tsujimoto, Yoshiyuki Tsuji
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Patent number: 7955511Abstract: A silica glass crucible used for pulling up silicon single crystal at a high temperature. The silica glass crucible may have at least an outer surface of a wall part of the crucible covered with fine grooves having a length of less than 200 ?m, a width of less than 30 ?m and a depth of from more than 3 ?m to less than 30 ?m. The fine groves may be formed by carrying out a sand-blast treatment and a hydrofluoric acid etching and may exist on more than 10% of the outer surface of the crucible, and a sliding frictional coefficient of the outer surface of the crucible to a carbon at 1500° C. is more than 0.6.Type: GrantFiled: March 4, 2010Date of Patent: June 7, 2011Assignee: Japan Super Quartz CorporationInventors: Yoshiyuki Tsuji, Toshio Tsujimoto
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Patent number: 7776155Abstract: A surface modified quartz glass crucible and a process for modifying the crucible includes a layer of a metal oxide on the whole or a part of the inside and/or outside of the crucible, and baking it. At least an inside surface of the crucible is coated with a said metal oxide of magnesium, calcium, strontium or barium. The coated layer of the crucible does not abrade easily and provides a high dislocation free ratio of silicon single crystals pulled by using the crucible.Type: GrantFiled: January 8, 2007Date of Patent: August 17, 2010Assignee: Japan Super Quartz CorporationInventors: Toshio Tsujimoto, Yoshiyuki Tsuji
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Publication number: 20100192841Abstract: A process reinforcing a silica glass substance, such as a silica glass crucible, is provided without intermixing an impurity. The process comprises forming a silica glass powder layer on a surface of the silica glass substance, and crystallizing said silica glass powder layer under high temperature. As for a silica glass crucible, the process for reinforcing the silica glass crucible and the reinforced silica glass crucible are provided, wherein the silica glass powder layer on the whole or a part of the surface of the crucible is formed and then, crystallized under a temperature at the melting of a silicon raw material being charged into said quartz glass crucible.Type: ApplicationFiled: April 13, 2010Publication date: August 5, 2010Applicant: JAPAN SUPER QUARTZ CORPORATIONInventors: Toshio TSUJIMOTO, Hiroya Ishizuka, Naotaka Fumoto
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Publication number: 20100154703Abstract: To provide a silica glass crucible, wherein there are no problems of generating a sinking and buckling when said crucible is used for pulling up silicon single crystal at a high temperature. The silica glass crucible used for pulling up the silicon single crystal, wherein at least an outer surface of a wall part of the crucible is covered with fine grooves having a length of less than 200 ?m, a width of less than 30 ?m and a depth of from more than 3 ?m to less than 30 ?m. Preferably, said fine groves are formed by carrying out a sand-blast treatment and a hydrofluoric acid etching and exist on more than 10% of the outer surface of the crucible, and a sliding frictional coefficient of the outer surface of the crucible to a carbon at 1500 degree C. is more than 0.6.Type: ApplicationFiled: March 4, 2010Publication date: June 24, 2010Applicant: JAPAN SUPER QUARTZ CORPORATIONInventors: Yoshiyuki TSUJI, Toshio Tsujimoto
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Publication number: 20100154702Abstract: A surface modified quartz glass crucible and a process for modifying the crucible includes a layer of a metal oxide on the whole or a part of the inside and/or outside of the crucible, and baking it. At least an inside surface of the crucible is coated with a said metal oxide of magnesium, calcium, strontium or barium. The coated layer of the crucible does not abrade easily and provides a high dislocation free ratio of silicon single crystals pulled by using the crucible.Type: ApplicationFiled: March 3, 2010Publication date: June 24, 2010Applicant: JAPAN SUPER QUARTZ CORPORATIONInventors: Toshio Tsujimoto, Yoshiyuki Tsuji
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Patent number: 7695787Abstract: To provide a silica glass crucible, wherein there are no problems of generating a sinking and buckling when said crucible is used for pulling up silicon single crystal at a high temperature. The silica glass crucible used for pulling up the silicon single crystal, wherein at least an outer surface of a wall part of the crucible is covered with fine grooves having a length of less than 200 ?m, a width of less than 30 ?m and a depth of from more than 3 ?m to less than 30 ?m. Preferably, said fine groves are formed by carrying out a sand-blast treatment and a hydrofluoric acid etching and exist on more than 10% of the outer surface of the crucible, and a sliding frictional coefficient of the outer surface of the crucible to a carbon at 1500 degree C. is more than 0.6.Type: GrantFiled: March 17, 2004Date of Patent: April 13, 2010Assignee: Japan Super Quartz CorporationInventors: Yoshiyuki Tsuji, Toshio Tsujimoto
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Publication number: 20080078207Abstract: A process reinforcing a silica glass substance, such as a silica glass crucible, is provided without intermixing an impurity. The process comprises forming a silica glass powder layer on a surface of the silica glass substance, and crystallizing said silica glass powder layer under high temperature. As for a silica glass crucible, the process for reinforcing the silica glass crucible and the reinforced silica glass crucible are provided, wherein the silica glass powder layer on the whole or a part of the surface of the crucible is formed and then, crystallized under a temperature at the melting of a silicon raw material being charged into said quartz glass crucible.Type: ApplicationFiled: September 28, 2007Publication date: April 3, 2008Applicant: JAPAN SUPER QUARTZ CORPORATIONInventors: Toshio Tsujimoto, Hiroya Ishizuka, Naotaka Fumoto
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Publication number: 20070111151Abstract: A surface modified quartz glass crucible and a process for modifying the crucible includes a layer of a metal oxide on the whole or a part of the inside and/or outside of the crucible, and baking it. At least an inside surface of the crucible is coated with a said metal oxide of magnesium, calcium, strontium or barium. The coated layer of the crucible does not abrade easily and provides a high dislocation free ratio of silicon single crystals pulled by using the crucible.Type: ApplicationFiled: January 8, 2007Publication date: May 17, 2007Applicant: JAPAN SUPER QUARTZ CORPORATIONInventors: Toshio Tsujimoto, Yoshiyuki Tsuji
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Publication number: 20040187771Abstract: To provide a silica glass crucible, wherein there are no problems of generating a sinking and buckling when said crucible is used for pulling up silicon single crystal at a high temperature. The silica glass crucible used for pulling up the silicon single crystal, wherein at least an outer surface of a wall part of the crucible is covered with fine grooves having a length of less than 200 &mgr;m, a width of less than 30 &mgr;m and a depth of from more than 3 &mgr;m to less than 30 &mgr;m. Preferably, said fine groves are formed by carrying out a sand-blast treatment and a hydrofluoric acid etching and exist on more than 10% of the outer surface of the crucible, and a sliding frictional coefficient of the outer surface of the crucible to a carbon at 1500 degree C. is more than 0.6.Type: ApplicationFiled: March 17, 2004Publication date: September 30, 2004Applicant: JAPAN SUPER QUARTZ CORPORATIONInventors: Yoshiyuki Tsuji, Toshio Tsujimoto
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Publication number: 20040112274Abstract: A process reinforcing a silica glass substance, such as a silica glass crucible, is provided without intermixing an impurity. The process comprises forming a silica glass powder layer on a surface of the silica glass substance, and crystallizing said silica glass powder layer under high temperature. As for a silica glass crucible, the process for reinforcing the silica glass crucible and the reinforced silica glass crucible are provided, wherein the silica glass powder layer on the whole or a part of the surface of the crucible is formed and then, crystallized under a temperature at the melting of a silicon raw material being charged into said quartz glass crucible.Type: ApplicationFiled: September 30, 2003Publication date: June 17, 2004Applicant: JAPAN SUPER QUARTZ CORPORATIONInventors: Toshio Tsujimoto, Hiroya Ishizuka, Naotaka Fumoto
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Publication number: 20040103841Abstract: A process for modifying the surface of a quartz glass crucible and a modified quartz glass crucible produced by the process, where the crucible has a transparent coated layer containing a crystallization accelerator on the surface. The process includes coating a mixed solution containing a metal salt and a partial hydrolyzate of alkoxysilane oligomer on the surface of the crucible and heating to obtain a quartz glass crucible having a transparent coated layer. The crystallization accelerator contains a metal oxide or a metal carbonate dispersed in a silica matrix.Type: ApplicationFiled: November 25, 2003Publication date: June 3, 2004Applicant: JAPAN SUPER QUARTZ CORPORATIONInventors: Toshio Tsujimoto, Yoshiyuki Tsuji
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Patent number: 6712901Abstract: A process for modifying the surface of a quartz glass crucible and a modified quartz glass crucible produced by the process, where the crucible has a transparent coated layer containing a crystallization accelerator on the surface. The process includes coating a mixed solution containing a metal salt and a partial hydrolyzate of alkoxysilane oligomer on the surface of the crucible and heating to obtain a quartz glass crucible having a transparent coated layer. The crystallization promoter contains a metal oxide or a metal carbonate dispersed in a silica matrix.Type: GrantFiled: June 6, 2002Date of Patent: March 30, 2004Assignee: Japan Super Quartz CorporationInventors: Toshio Tsujimoto, Yoshiyuki Tsuji
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Publication number: 20030183161Abstract: A surface modified quartz glass crucible and a process for modifying the crucible includes a layer of a metal oxide on the whole or a part of the inside and/or outside of the crucible, and baking it. At least an inside surface of the crucible is coated with a said metal oxide of magnesium, calcium, strontium or barium. The coated layer of the crucible does not abrade easily and provides a high dislocation free ratio of silicon single crystals pulled by using the crucible.Type: ApplicationFiled: June 6, 2002Publication date: October 2, 2003Applicant: JAPAN SUPER QUARTZ CORPORATIONInventors: Toshio Tsujimoto, Yoshiyuki Tsuji
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Publication number: 20030094131Abstract: A process for modifying the surface of a quartz glass crucible and a modified quartz glass crucible produced by the process, where the crucible has a transparent coated layer containing a crystallization accelerator on the surface. The process includes coating a mixed solution containing a metal salt and a partial hydrolyzate of alkoxysilane oligomer on the surface of the crucible and heating to obtain a quartz glass crucible having a transparent coated layer. The crystallization accelerator contains a metal oxide or a metal carbonate dispersed in a silica matrix.Type: ApplicationFiled: June 6, 2002Publication date: May 22, 2003Applicant: JAPAN SUPER QUARTZ CORPORATIONInventors: Toshio Tsujimoto, Yoshiyuki Tsuji