Patents by Inventor Wataru Soga
Wataru Soga 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: 11383190Abstract: A ceramic honeycomb filter comprising a cordierite-type ceramic honeycomb structure having large numbers of flow paths partitioned by porous cell walls, and plugs formed in end portions of predetermined flow paths of the ceramic honeycomb structure; the cell walls having a thermal expansion coefficient Tw (×10?7/° C.) of 10 or less in the flow path direction between 40° C. and 800° C.; the plugs comprising at least ceramic particles, and 5-25 parts by mass of an amorphous oxide matrix per 100 parts by mass of the ceramic particles; the ceramic particles comprising at least 42-90% by mass of amorphous silica particles, and 10-58% by mass of cordierite particles; and the amorphous silica particles comprising 4-30% by mass of first silica particles having a median particle diameter of 10-40 ?m, and 70-96% by mass of second silica particles having a median particle diameter of 70-200 ?m.Type: GrantFiled: March 29, 2019Date of Patent: July 12, 2022Assignee: HITACHI METALS, LTD.Inventor: Wataru Soga
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Publication number: 20210060466Abstract: A ceramic honeycomb filter comprising a cordierite-type ceramic honeycomb structure having large numbers of flow paths partitioned by porous cell walls, and plugs formed in end portions of predetermined flow paths of the ceramic honeycomb structure; the cell walls having a thermal expansion coefficient Tw (×10?7/° C.) of 10 or less in the flow path direction between 40° C. and 800° C.; the plugs comprising at least ceramic particles, and 5-25 parts by mass of an amorphous oxide matrix per 100 parts by mass of the ceramic particles; the ceramic particles comprising at least 42-90% by mass of amorphous silica particles, and 10-58% by mass of cordierite particles; and the amorphous silica particles comprising 4-30% by mass of first silica particles having a median particle diameter of 10-40 ?m, and 70-96% by mass of second silica particles having a median particle diameter of 70-200 ?m.Type: ApplicationFiled: March 29, 2019Publication date: March 4, 2021Applicant: HITACHI METALS, LTD.Inventor: Wataru SOGA
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Patent number: 10737207Abstract: A method for producing a ceramic honeycomb filter having a ceramic honeycomb structure having plugs in predetermined cells: comprising using an apparatus having a reservoir having an inlet for a plugging material slurry and an upper opening, a porous plate with pluralities of openings covering the upper opening of the reservoir, and a holding member fixed to an upper end of the reservoir; keeping a lower surface of the sealing film attached to a lower end surface of the ceramic honeycomb structure apart from an upper surface of the porous plate by a distance D of more than 0 mm and 2.0 mm or less; supplying a predetermined volume of the plugging material slurry into the reservoir to introduce it into the predetermined cells of the ceramic honeycomb structure; rotating the ceramic honeycomb structure after sealing of the ceramic honeycomb structure is released; and lifting the ceramic honeycomb structure after the rotation starts.Type: GrantFiled: September 29, 2017Date of Patent: August 11, 2020Assignee: HITACHI METALS, LTD.Inventor: Wataru Soga
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Patent number: 10556833Abstract: A ceramic honeycomb filter comprising a ceramic honeycomb structure having pluralities of flow paths partitioned by porous cordierite cell walls, and plugs formed in predetermined flow paths of the ceramic honeycomb structure; the plugs being formed by ceramic particles and an amorphous oxide matrix existing between the ceramic particles; in a cross section of the plugs, an area ratio A1 of the amorphous oxide matrix in a longitudinal range of ?×t from one end, and an area ratio A2 of the amorphous oxide matrix in a longitudinal range of ?×t from the other end meeting the relation of ½?A1/A2?2, wherein t represents the length of the plug in a direction perpendicular to the longitudinal direction of the plug.Type: GrantFiled: January 11, 2018Date of Patent: February 11, 2020Assignee: HITACHI METALS, LTD.Inventors: Atsuhiro Noguchi, Wataru Soga
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Publication number: 20190201825Abstract: A method for producing a ceramic honeycomb filter having a ceramic honeycomb structure having plugs in predetermined cells: comprising using an apparatus having a reservoir having an inlet for a plugging material slurry and an upper opening, a porous plate with pluralities of openings covering the upper opening of the reservoir, and a holding member fixed to an upper end of the reservoir; keeping a lower surface of the sealing film attached to a lower end surface of the ceramic honeycomb structure apart from an upper surface of the porous plate by a distance D of more than 0 mm and 2.0 mm or less; supplying a predetermined volume of the plugging material slurry into the reservoir to introduce it into the predetermined cells of the ceramic honeycomb structure; rotating the ceramic honeycomb structure after sealing of the ceramic honeycomb structure is released; and lifting the ceramic honeycomb structure after the rotation starts.Type: ApplicationFiled: September 29, 2017Publication date: July 4, 2019Applicant: HITACHI METALS, LTD.Inventor: Wataru SOGA
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Patent number: 9981881Abstract: A ceramic honeycomb filter comprising a ceramic honeycomb structure having pluralities of flow paths partitioned by porous cordierite cell walls, and plugs formed in predetermined flow paths of the ceramic honeycomb structure; the plugs being formed by ceramic particles and an amorphous oxide matrix existing between the ceramic particles; in a cross section of the plugs, an area ratio A1 of the amorphous oxide matrix in a longitudinal range of ?×t from one end, and an area ratio A2 of the amorphous oxide matrix in a longitudinal range of ?×t from the other end meeting the relation of ½?A1/A2?2, wherein t represents the length of the plug in a direction perpendicular to the longitudinal direction of the plug.Type: GrantFiled: September 30, 2015Date of Patent: May 29, 2018Assignee: HITACHI METALS, LTD.Inventors: Atsuhiro Noguchi, Wataru Soga
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Publication number: 20180134630Abstract: A ceramic honeycomb filter comprising a ceramic honeycomb structure having pluralities of flow paths partitioned by porous cordierite cell walls, and plugs formed in predetermined flow paths of the ceramic honeycomb structure; the plugs being formed by ceramic particles and an amorphous oxide matrix existing between the ceramic particles; in a cross section of the plugs, an area ratio A1 of the amorphous oxide matrix in a longitudinal range of ?×t from one end, and an area ratio A2 of the amorphous oxide matrix in a longitudinal range of ?×t from the other end meeting the relation of ½?A1/A2?2, wherein t represents the length of the plug in a direction perpendicular to the longitudinal direction of the plug.Type: ApplicationFiled: January 11, 2018Publication date: May 17, 2018Applicant: HITACHI METALS, LTD.Inventors: Atsuhiro Noguchi, Wataru Soga
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Patent number: 9950964Abstract: A method for producing a ceramic honeycomb structure comprising a ceramic honeycomb body having large numbers of longitudinal cells partitioned by porous cell walls, and a peripheral wall formed on a peripheral surface of the ceramic honeycomb structure, comprising the steps of extruding a moldable ceramic material to form a honeycomb-structured ceramic green body; machining a peripheral portion of the green body or a sintered body obtained from the green body to remove part of cell walls in the peripheral portion, thereby obtaining the ceramic honeycomb body having longitudinal grooves on the peripheral surface; applying a coating material to the peripheral surface of the ceramic honeycomb body to form the peripheral wall, as well as to peripheral portions of both end surfaces of the ceramic honeycomb body; and inserting the coating material applied to the peripheral portions of both end surfaces into peripheral cells, with partially remaining on the peripheral portions.Type: GrantFiled: September 21, 2012Date of Patent: April 24, 2018Assignee: HITACHI METALS LTD.Inventor: Wataru Soga
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Publication number: 20170313628Abstract: A ceramic honeycomb filter comprising a ceramic honeycomb structure having pluralities of flow paths partitioned by porous cordierite cell walls, and plugs formed in predetermined flow paths of the ceramic honeycomb structure; the plugs being formed by ceramic particles and an amorphous oxide matrix existing between the ceramic particles; in a cross section of the plugs, an area ratio A1 of the amorphous oxide matrix in a longitudinal range of ?×t from one end, and an area ratio A2 of the amorphous oxide matrix in a longitudinal range of ?×t from the other end meeting the relation of ½?A1/A2?2, wherein t represents the length of the plug in a direction perpendicular to the longitudinal direction of the plug.Type: ApplicationFiled: September 30, 2015Publication date: November 2, 2017Applicant: HITACHI METALS, LTD.Inventors: Atsuhiro NOGUCHI, Wataru SOGA
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Patent number: 8834783Abstract: A molding apparatus for producing a ceramic molding comprising a material-flowing path, a molding die disposed at one end of the material-flowing path, and a pressurizing means for extrusion-molding the molding material; the material-flowing path comprising pluralities of porous plates for passing the molding material and a screen fixed therebetween, and a method for producing a ceramic molding using this apparatus.Type: GrantFiled: September 17, 2009Date of Patent: September 16, 2014Assignee: Hitachi Metals, Ltd.Inventor: Wataru Soga
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Publication number: 20140248464Abstract: A method for producing a ceramic honeycomb structure comprising a ceramic honeycomb body having large numbers of longitudinal cells partitioned by porous cell walls, and a peripheral wall formed on a peripheral surface of the ceramic honeycomb structure, comprising the steps of extruding a moldable ceramic material to form a honeycomb-structured ceramic green body; machining a peripheral portion of the green body or a sintered body obtained from the green body to remove part of cell walls in the peripheral portion, thereby obtaining the ceramic honeycomb body having longitudinal grooves on the peripheral surface; applying a coating material to the peripheral surface of the ceramic honeycomb body to form the peripheral wall, as well as to peripheral portions of both end surfaces of the ceramic honeycomb body; and inserting the coating material applied to the peripheral portions of both end surfaces into peripheral cells, with partially remaining on the peripheral portions.Type: ApplicationFiled: September 21, 2012Publication date: September 4, 2014Applicant: HITACHI METALS, LTD.Inventor: Wataru Soga
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Publication number: 20110180956Abstract: A molding apparatus for producing a ceramic molding comprising a material-flowing path, a molding die disposed at one end of the material-flowing path, and a pressurizing means for extrusion-molding the molding material; the material-flowing path comprising pluralities of porous plates for passing the molding material and a screen fixed therebetween, and a method for producing a ceramic molding using this apparatus.Type: ApplicationFiled: September 17, 2009Publication date: July 28, 2011Applicant: HITACHI METALS, LTD.Inventor: Wataru Soga