Patents by Inventor Noriaki Hirota
Noriaki Hirota 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: 11597982Abstract: A process of producing a fine-grained austenitic stainless steel, the process comprising a step of subjecting a fine-grained austenitic stainless steel comprising: C: 0.15 wt % or less, Si: 1.00 wt % or less, Mn: 2.0 wt % or less, Ni: 6.0 to 14.0 wt %, Cr: 16.0 to 22.0 wt %, and Mo: 3.0 wt % or less, with the balance being Fe and inevitable impurities, and having an average grain size of 10 ?m or lower, to an annealing treatment at a temperature from 600° C. to 700° C. for 48 hours or longer.Type: GrantFiled: September 23, 2019Date of Patent: March 7, 2023Assignee: JAPAN ATOMIC ENERGY AGENCYInventors: Noriaki Hirota, Tomoaki Takeuchi, Hiroko Nakano, Atsushi Kikuchi
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Publication number: 20200102625Abstract: A process of producing a fine-grained austenitic stainless steel, said process comprising a step of subjecting a fine-grained austenitic stainless steel comprising: C: 0.15 wt % or less, Si: 1.00 wt % or less, Mn: 2.0 wt % or less, Ni: 6.0 to 14.0 wt %, Cr: 16.0 to 22.0 wt %, and Mo: 3.0 wt % or less, with the balance being Fe and inevitable impurities, and having an average grain size of 10 ?m or lower, to an annealing treatment at a temperature from 600° C. to 700° C. for 48 hours or longer.Type: ApplicationFiled: September 23, 2019Publication date: April 2, 2020Applicant: JAPAN ATOMIC ENERGY AGENCYInventors: Noriaki HIROTA, Tomoaki TAKEUCHI, Hiroko NAKANO, Atsushi KIKUCHI
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Patent number: 7208254Abstract: In an electrophotographic apparatus, which forms a color image by transferring a plurality of toner images having different colors onto an image-receiving sheet so as to be stacked and fixed thereon, even in the case of carrying out an oil-less fixing process and allowing the process speed to vary within wide range, the present invention provides a binder resin, toner and an electrophotographic apparatus which make it possible to achieve both superior fixing property and anti-offset property, and consequently to form a color image with high color reproducibility and high quality.Type: GrantFiled: February 13, 2006Date of Patent: April 24, 2007Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Yasuhito Yuasa, Noriaki Hirota, Masahisa Maeda
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Patent number: 7063929Abstract: In an electrophotographic apparatus, which forms a color image by transferring a plurality of toner images having different colors onto an image-receiving sheet so as to be stacked and fixed thereon, even in the case of carrying out an oil-less fixing process and allowing the process speed to vary within wide range, the present invention provides a binder resin, toner and an electrophotographic apparatus which make it possible to achieve both superior fixing property and anti-offset property, and consequently to form a color image with high color reproducibility and high quality.Type: GrantFiled: April 24, 2003Date of Patent: June 20, 2006Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Yasuhito Yuasa, Noriaki Hirota, Masahisa Maeda
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Publication number: 20060127789Abstract: In an electrophotographic apparatus, which forms a color image by transferring a plurality of toner images having different colors onto an image-receiving sheet so as to be stacked and fixed thereon, even in the case of carrying out an oil-less fixing process and allowing the process speed to vary within wide range, the present invention provides a binder resin, toner and an electrophotographic apparatus which make it possible to achieve both superior fixing property and anti-offset property, and consequently to form a color image with high color reproducibility and high quality.Type: ApplicationFiled: February 13, 2006Publication date: June 15, 2006Inventors: Yasuhito Yuasa, Noriaki Hirota, Masahisa Maeda
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Publication number: 20050053858Abstract: In an electrophotographic apparatus, which forms a color image by transferring a plurality of toner images having different colors onto an image-receiving sheet so as to be stacked and fixed thereon, even in the case of carrying out an oil-less fixing process and allowing the process speed to vary within wide range, the present invention provides a binder resin, toner and an electrophotographic apparatus which make it possible to achieve both superior fixing property and anti-offset property, and consequently to form a color image with high color reproducibility and high quality.Type: ApplicationFiled: April 24, 2003Publication date: March 10, 2005Inventors: Yasuhito Yuasa, Noriaki Hirota, Masahisa Maeda
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Patent number: 6733945Abstract: Toner of the present invention at least includes binder resin, a colorant, and an external additive, wherein a loss modulus G″t (frequency: 10 rad/s) of the toner at 170° C. satisfies 100≦G″t≦5000 (Pa), a storage modulus G′t (frequency: 10 rad/s) of the toner at 190° C. satisfies 10≦G′t≦3000 (Pa), and the toner contains 5 to 50% by number of toner particles with a size of 2×10−6 to 5×10−6 m in size distribution of the toner.Type: GrantFiled: May 12, 2003Date of Patent: May 11, 2004Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Noriaki Hirota, Yasuhito Yuasa, Hideki Tatematsu, Masahisa Maeda
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Publication number: 20030207192Abstract: Toner of the present invention at least includes binder resin, a colorant, and an external additive, wherein a loss modulus G″t (frequency: 10 rad/s) of the toner at 170° C. satisfies 100≦G″t≦5000 (Pa), a storage modulus G′t (frequency: 10 rad/s) of the toner at 190° C. satisfies 10≦G′t≦3000 (Pa), and the toner contains 5 to 50% by number of toner particles with a size of 2×10−6 to 5×10−6 m in size distribution of the toner.Type: ApplicationFiled: May 12, 2003Publication date: November 6, 2003Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.Inventors: Noriaki Hirota, Yasuhito Yuasa, Hideki Tatematsu, Masahisa Maeda
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Patent number: 6593051Abstract: Toner of the present invention at least includes binder resin, a colorant, and an external additive, wherein a loss modulus G″t (frequency: 10 rad/s) of the toner at 170° C. satisfies 100≦G″t≦5000 (Pa), a storage modulus G′t (frequency: 10 rad/s) of the toner at 190° C. satisfies 10≦G′t≦3000 (Pa), and the toner contains 5 to 50% by number of toner particles with a size of 2×10−6 to 5×10−6 m in size distribution of the toner.Type: GrantFiled: December 14, 1999Date of Patent: July 15, 2003Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Noriaki Hirota, Yasuhito Yuasa, Hideki Tatematsu, Masahisa Maeda
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Patent number: 6579653Abstract: In an electrophotographic apparatus, which forms a color image by transferring a plurality of toner images having different colors onto an image-receiving sheet so as to be stacked and fixed thereon, even in the case of carrying out an oil-less fixing process and allowing the process speed to vary within wide range, the present invention provides a binder resin, toner and an electrophotographic apparatus which make it possible to achieve both superior fixing property and anti-offset property, and consequently to form a color image with high color reproducibility and high quality.Type: GrantFiled: September 14, 2001Date of Patent: June 17, 2003Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Yasuhito Yuasa, Noriaki Hirota, Masahisa Maeda
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Patent number: 6432599Abstract: The present invention provides a toner comprising a binding resin, a colorant, and an ester based wax having an iodine value of not more than 25 and a saponification value of 30 to 300 (for example, at least one selected from the group consisting of meadowfoam oil and derivatives thereof and jojoba oil and derivatives thereof) and a method for producing the same. The present invention also provides a toner comprising silica fine powder containing a component having a polydimethyl siloxane skeleton extracted by an organic solvent at a content of not more than 2.5 wt %, and a method for producing the same. This stabilizes the chargeability and flowability of the toner during long period use, and reduces the filming on a photoconductive member or a transfer medium, Moreover, toner that provides good fixability, anti-offset properties, waste toner recycle properties, and transfer efficiency can be obtained with good reproducibility.Type: GrantFiled: October 12, 2001Date of Patent: August 13, 2002Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Yasuhito Yuasa, Noriaki Hirota, Masahisa Maeda
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Publication number: 20020086229Abstract: The present invention provides a toner comprising a binding resin, a colorant, and an ester based wax having an iodine value of not more than 25 and a saponification value of 30 to 300 (for example, at least one selected from the group consisting of meadowfoam oil and derivatives thereof and jojoba oil and derivatives thereof) and a method for producing the same. The present invention also provides a toner comprising silica fine powder containing a component having a polydimethyl siloxane skeleton extracted by an organic solvent at a content of not more than 2.5 wt %, and a method for producing the same. This stabilizes the chargeability and flowability of the toner during long period use, and reduces the filming on a photoconductive member or a transfer medium. Moreover, toner that provides good fixability, anti-offset properties, waste toner recycle properties, and transfer efficiency can be obtained with good reproducibility.Type: ApplicationFiled: October 12, 2001Publication date: July 4, 2002Inventors: Yasuhito Yuasa, Noriaki Hirota, Masahisa Maeda
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Patent number: 6326116Abstract: The present invention provides a toner comprising a binding resin, a colorant, and an ester based wax having an iodine value of not more than 25 and a saponification value of 30 to 300 (for example, at least one selected from the group consisting of meadowfoam oil and derivatives thereof and jojoba oil and derivatives thereof) and a method for producing the same. The present invention also provides a toner comprising silica fine powder containing a component having a polydimethyl siloxane skeleton extracted by an organic solvent at a content of not more than 2.5 wt %, and a method for producing the same. This stabilizes the chargeability and flowability of the toner during long period use, and eliminates the filming on a photoconductive member or a transfer medium. Moreover, toner that provides good fixability, anti-offset properties, waste toner recycle properties, and transfer efficiency can be obtained with good reproducibility.Type: GrantFiled: January 4, 2001Date of Patent: December 4, 2001Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Yasuhito Yuasa, Noriaki Hirota, Masahisa Maeda
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Patent number: 6270937Abstract: The present invention provides a toner comprising a binding resin, a colorant, and an ester based wax having an iodine value of not more than 25 and a saponification value of 30 to 300 (for example, at least one selected from the group consisting of meadowfoam oil and derivatives thereof and jojoba oil and derivatives thereof) and a method for producing the same. The present invention also provides a toner comprising silica fine powder containing a component having a polydimethyl siloxane skeleton extracted by an organic solvent at a content of not more than 2.5 wt %, and a method for producing the same. This stabilizes the chargeability and flowability of the toner during long period use, and eliminates the filming on a photoconductive member or a transfer medium, Moreover, toner that provides good fixability, anti-offset properties, waste toner recycle properties, and transfer efficiency can be obtained with good reproducibility.Type: GrantFiled: January 4, 2001Date of Patent: August 7, 2001Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Yasuhito Yuasa, Noriaki Hirota, Masahisa Maeda
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Publication number: 20010002305Abstract: The present invention provides a toner comprising a binding resin, a colorant, and an ester based wax having an iodine value of not more than 25 and a saponification value of 30 to 300 (for example, at least one selected from the group consisting of meadowfoam oil and derivatives thereof and jojoba oil and derivatives thereof) and a method for producing the same. The present invention also provides a toner comprising silica fine powder containing a component having a polydimethyl siloxane skeleton extracted by an organic solvent at a content of not more than 2.5 wt %, and a method for producing the same. This stabilizes the chargeability and flowability of the toner during long period use, and eliminates the filming on a photoconductive member or a transfer medium, Moreover, toner that provides good fixability, anti-offset properties, waste toner recycle properties, and transfer efficiency can be obtained with good reproducibility.Type: ApplicationFiled: January 4, 2001Publication date: May 31, 2001Applicant: Matsushita Electric Industrial Co., Ltd.Inventors: Yasuhito Yuasa, Noriaki Hirota, Masahisa Maeda
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Publication number: 20010000743Abstract: The present invention provides a toner comprising a binding resin, a colorant, and an ester based wax having an iodine value of not more than 25 and a saponification value of 30 to 300 (for example, at least one selected from the group consisting of meadowfoam oil and derivatives thereof and jojoba oil and derivatives thereof) and a method for producing the same. The present invention also provides a toner comprising silica fine powder containing a component having a polydimethyl siloxane skeleton extracted by an organic solvent at a content of not more than 2.5 wt %, and a method for producing the same. This stabilizes the chargeability and flowability of the toner during long period use, and eliminates the filming on a photoconductive member or a transfer medium, Moreover, toner that provides good fixability, anti-offset properties, waste toner recycle properties, and transfer efficiency can be obtained with good reproducibility.Type: ApplicationFiled: January 4, 2001Publication date: May 3, 2001Applicant: Matsushita Electric Industrial Co., Ltd.Inventors: Yasuhito Yuasa, Noriaki Hirota, Masahisa Maeda
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Patent number: 5985506Abstract: A magnetic toner for use in electrophotographic development which can be endowed with high performance by subjecting it to surface treatment with hot air in its dispersed state. The magnetic toner is used in an electrophotographic system including a development process in which an electrostatic latent image is formed by using a photoconductive drum having a stationary magnet therein, and thereafter the magnetic toner is sucked in a toner sump by magnetic force, whereby non-image area toner is recovered by an electrode roller, and the electrophotographic system including a recycle process of the residual toner. The magnetic toner is capable of realizing high-quality image development and stable recycle of residual toner by subjecting the magnetic toner to surface treatment with hot air.Type: GrantFiled: May 24, 1996Date of Patent: November 16, 1999Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Yasuhito Yuasa, Akinori Toyoda, Noriaki Hirota
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Patent number: 5702858Abstract: Toner used for electrophotographic development includes additives such as inorganic fine particles, having a particular particle diameter and specific surface area, and hydrophobic silica having a particular specific surface area and surface treatment, so that the toner can provide images of high quality without generating photoconductor filming. The toner is applied to the electrophotographic method including the developing step of forming electrostatic latent images on a photoconductor containing a stationary magnet, magnetically attracting the toner to the surface of the photoconductor in a toner sump, and collecting toner at a non-image section by an electrode roller; the transferring step of transferring the toner to transfer paper; the cleaning step of removing residual toner left on the photoconductor in the transferring step; and the recycling step of recycling the residual toner.Type: GrantFiled: July 12, 1996Date of Patent: December 30, 1997Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Yasuhito Yuasa, Noriaki Hirota, Akinori Toyoda, Hideki Tatematsu
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Patent number: 5561019Abstract: Magnetic toner used for electrophotographic development includes additives such as inorganic fine particles, having a particular particle diameter and specific surface area, and hydrophobic silica having a particular specific surface area and surface treatment, so that the magnetic toner can provide images of high quality without generating photoconductor filming. The magnetic toner is applied to the electrophotographic method including the developing step of forming electrostatic latent images on a photoconductor containing a stationary magnet, magnetically attracting the magnetic toner to the surface of the photoconductor in a toner sump, and collecting toner at a non-image section by an electrode roller; the transferring step of transferring the toner to transfer paper; the cleaning step of removing residual magnetic toner left on the photoconductor in the transferring step; and the recycling step of recycling the residual magnetic toner.Type: GrantFiled: April 11, 1995Date of Patent: October 1, 1996Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Yasuhito Yuasa, Noriaki Hirota, Akinori Toyoda, Hideki Tatematsu