Patents by Inventor Hiroshi Kamiga

Hiroshi Kamiga 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).

  • Patent number: 10833209
    Abstract: A conductive paste including: a conductive powder containing silver; an indium powder; a silver-tellurium-coated glass powder; a solvent; and an organic binder, wherein the silver-tellurium-coated glass powder is a silver-tellurium-coated glass powder including a tellurium-based glass powder containing tellurium in an amount of 20% by mass or more, and a coating layer on a surface of the tellurium-based glass powder, the coating layer containing silver and tellurium as a main component.
    Type: Grant
    Filed: September 5, 2017
    Date of Patent: November 10, 2020
    Assignee: DOWA Electronics Materials Co., Ltd.
    Inventors: Kenichi Harigae, Hiroshi Kamiga, Noriaki Nogami
  • Patent number: 10807161
    Abstract: A silver powder, wherein the silver powder satisfies D50-IPA>D50-W, where in measurement of a volume-based particle size distribution of the silver powder by a laser diffraction particle size distribution analysis, D50-IPA (?m) is a cumulative 50% point of particle diameter of the silver powder when isopropyl alcohol (IPA) is used as a measurement solvent for dispersing the silver powder, and D50-W (?m) is a cumulative 50% point of particle diameter of the silver powder when water is used as a measurement solvent for dispersing the silver powder, and wherein a phosphorus content in the silver powder is 0.01% by mass or more but 0.3% by mass or less.
    Type: Grant
    Filed: March 11, 2019
    Date of Patent: October 20, 2020
    Assignee: DOWA Electronics Materials Co., Ltd.
    Inventors: Naoki Tahara, Noriaki Nogami, Hiroshi Kamiga
  • Patent number: 10580910
    Abstract: There is provided a silver-coated copper powder which can improve the conversion efficiency of a solar cell in comparison with conventional silver-coated copper powders when it is used in an electrically conductive paste used for forming the busbar electrodes of the solar cell, the silver-coated copper powder being capable of producing a solar cell having a high conversion efficiency which is the same degree as that of a solar cell using silver powder, and a method for producing the same.
    Type: Grant
    Filed: January 26, 2017
    Date of Patent: March 3, 2020
    Assignee: Dowa Electronics Materials Co., Ltd.
    Inventors: Hiroshi Kamiga, Noriaki Nogami, Aiko Hirata
  • Patent number: 10460851
    Abstract: Provided is a silver-tellurium-coated glass powder including: a tellurium-based glass powder containing tellurium in an amount of 20% by mass or more; and a coating layer on a surface of the tellurium-based glass powder, the coating layer containing silver and tellurium as a main component. Preferable aspects include an aspect where the coating layer containing silver and tellurium as a main component further contains a component that is other than silver and tellurium and contained in the tellurium-based glass powder, and an aspect where the component that is lo other than silver and tellurium and contained in the tellurium-based glass powder contains one or more kinds selected from zinc, lead, bismuth, silicon, lithium, and aluminum.
    Type: Grant
    Filed: March 15, 2017
    Date of Patent: October 29, 2019
    Assignee: DOWA Electronics Materials Co., Ltd.
    Inventors: Hiroshi Kamiga, Taro Nakanoya, Noriaki Nogami, Kenichi Harigae
  • Publication number: 20190247920
    Abstract: A silver powder, wherein the silver powder satisfies D50-IPA>D50-W, where in measurement of a volume-based particle size distribution of the silver powder by a laser diffraction particle size distribution analysis, D50-IPA (?m) is a cumulative 50% point of particle diameter of the silver powder when isopropyl alcohol (IPA) is used as a measurement solvent for dispersing the silver powder, and D50-W (?m) is a cumulative 50% point of particle diameter of the silver powder when water is used as a measurement solvent for dispersing the silver powder, and wherein a phosphorus content in the silver powder is 0.01% by mass or more but 0.3% by mass or less.
    Type: Application
    Filed: March 11, 2019
    Publication date: August 15, 2019
    Inventors: Naoki TAHARA, Noriaki NOGAMI, Hiroshi KAMIGA
  • Patent number: 10381124
    Abstract: To provide a silver powder including alkenylsuccinic anhydride and/or alkenylsuccinic acid on a surface of the silver powder.
    Type: Grant
    Filed: August 22, 2016
    Date of Patent: August 13, 2019
    Assignee: DOWA Electronics Materials Co., Ltd.
    Inventors: Naoki Tahara, Hiroshi Kamiga
  • Publication number: 20190189810
    Abstract: A conductive paste including: a conductive powder containing silver; an indium powder; a silver-tellurium-coated glass powder; a solvent; and an organic binder, wherein the silver-tellurium-coated glass powder is a silver-tellurium-coated glass powder including a tellurium-based glass powder containing tellurium in an amount of 20% by mass or more, and a coating layer on a surface of the tellurium-based glass powder, the coating layer containing silver and tellurium as a main component.
    Type: Application
    Filed: September 5, 2017
    Publication date: June 20, 2019
    Inventors: Kenichi Harigae, Hiroshi Kamiga, Noriaki Nogami
  • Patent number: 10272490
    Abstract: A silver powder, wherein the silver powder satisfies D50-IPA>D50-W, where in measurement of a volume-based particle size distribution of the silver powder by a laser diffraction particle size distribution analysis, D50-IPA (?m) is a cumulative 50% point of particle diameter of the silver powder when isopropyl alcohol (IPA) is used as a measurement solvent for dispersing the silver powder, and D50-W (?m) is a cumulative 50% point of particle diameter of the silver powder when water is used as a measurement solvent for dispersing the silver powder, and wherein a phosphorus content in the silver powder is 0.01% by mass or more but 0.3% by mass or less.
    Type: Grant
    Filed: September 25, 2015
    Date of Patent: April 30, 2019
    Assignee: DOWA Electronics Materials Co., Ltd.
    Inventors: Naoki Tahara, Noriaki Nogami, Hiroshi Kamiga
  • Patent number: 10252331
    Abstract: A silver powder, including: an organic substance on a surface of the silver powder, the organic substance containing at least one carboxyl group and at least one hydroxyl group in one molecule of the organic substance, wherein a ratio of (Casson yield value/BET specific surface area) is 500 or less, where the Casson yield value is a Casson yield value of a conductive paste and the BET specific surface area is a BET specific surface area of the silver powder, where the conductive paste has a composition in which the silver powder is 86% by mass, a glass fit is 1% by mass, ethyl cellulose is 0.6% by mass, texanol is 10.5% by mass, and zinc oxide is 1.9% by mass, and the conductive paste is prepared by kneading the composition with a planetary centrifugal stirrer and bubble remover and dispersing with a triple roll mill.
    Type: Grant
    Filed: July 27, 2015
    Date of Patent: April 9, 2019
    Assignee: DOWA Electronics Materials Co., Ltd.
    Inventors: Taro Nakanoya, Hiroshi Kamiga
  • Publication number: 20190080815
    Abstract: Provided is a silver-tellurium-coated glass powder including: a tellurium-based glass powder containing tellurium in an amount of 20% by mass or more; and a coating layer on a surface of the tellurium-based glass powder, the coating layer containing silver and tellurium as a main component. Preferable aspects include an aspect where the coating layer containing silver and tellurium as a main component further contains a component that is other than silver and tellurium and contained in the tellurium-based glass powder, and an aspect where the component that is lo other than silver and tellurium and contained in the tellurium-based glass powder contains one or more kinds selected from zinc, lead, bismuth, silicon, lithium, and aluminum.
    Type: Application
    Filed: March 15, 2017
    Publication date: March 14, 2019
    Inventors: Hiroshi Kamiga, Taro Nakanoya, Noriaki Nogami, Kenichi Harigae
  • Publication number: 20190027620
    Abstract: There is provided a silver-coated copper powder which can improve the conversion efficiency of a solar cell in comparison with conventional silver-coated copper powders when it is used in an electrically conductive paste used for forming the busbar electrodes of the solar cell, the silver-coated copper powder being capable of producing a solar cell having a high conversion efficiency which is the same degree as that of a solar cell using silver powder, and a method for producing the same.
    Type: Application
    Filed: January 26, 2017
    Publication date: January 24, 2019
    Applicant: DOWA ELECTRONICS MATERIALS CO., LTD.
    Inventors: Hiroshi Kamiga, Noriaki Nogami, Aiko Hirata
  • Patent number: 10170213
    Abstract: There is provided a silver powder, which is able to obtain a conductive paste having a high thixotropic ratio and a high Casson yield value and which is able to form a conductive pattern having a low resistance, and a method for producing the same. An aliphatic amine such as hexadecylamine is added to a silver powder, the surface of which is coated with a fatty acid such as stearic acid, to be stirred and mixed to form the aliphatic amine on the outermost surface of the silver powder while allowing the fatty acid to react with the aliphatic amine to form an aliphatic amide such as hexadecanamide between the fatty acid and the aliphatic amine.
    Type: Grant
    Filed: January 2, 2018
    Date of Patent: January 1, 2019
    Assignee: Dowa Electronics Materials Co., Ltd.
    Inventors: Yoshiyuki Michiaki, Hiroshi Kamiga
  • Publication number: 20180272425
    Abstract: A silver-coated copper powder obtained by coating the surface of a copper powder, which is obtained by the atomizing method or the like, with 5 wt % or more (with respect to the silver-coated copper powder) of a silver containing layer of silver or a silver compound, is added to a silver supporting solution of a potassium silver cyanide solution (or a potassium silver cyanide solution containing at least one selected from the group consisting of potassium pyrophosphate, boric acid, tripotassium citrate monohydrate, anhydrous citric acid and L-aspartic acid) to cause 0.01 wt % or more (with respect to the silver-coated copper powder) of silver to be supported on the surface of the copper powder coated with the silver containing layer.
    Type: Application
    Filed: January 6, 2016
    Publication date: September 27, 2018
    Applicant: DOWA ELECTRONICS MATERIALS CO., LTD.
    Inventors: Noriaki Nogami, Hiroshi Kamiga
  • Publication number: 20180240566
    Abstract: To provide a silver powder including alkenylsuccinic anhydride and/or alkenylsuccinic acid on a surface of the silver powder.
    Type: Application
    Filed: August 22, 2016
    Publication date: August 23, 2018
    Inventors: Naoki Tahara, Hiroshi Kamiga
  • Patent number: 9993871
    Abstract: A silver powder, including: an organic substance on a surface of the silver powder, the organic substance containing at least one carboxyl group and at least one hydroxyl group in one molecule of the organic substance, wherein a BET specific surface area of the silver powder is 0.1 m2/g or more but 2.0 m2/g or less, and wherein a cumulative 50% point of particle diameter (D50) of the silver powder in a volume-based particle size distribution of the silver powder as measured by a laser diffraction particle size distribution analysis is 0.1 ?m or more but 6.0 ?m or less, and a ratio of [(D90?D10)/D50] is 3.0 or less, where D50 is the cumulative 50% point of particle diameter, D90 is a cumulative 90% point of particle diameter of the silver powder, and D10 is a cumulative 10% point of particle diameter of the silver powder.
    Type: Grant
    Filed: July 27, 2015
    Date of Patent: June 12, 2018
    Assignee: DOWA Electronics Materials Co., Ltd.
    Inventors: Taro Nakanoya, Hiroshi Kamiga
  • Publication number: 20180158564
    Abstract: There is provided a silver powder, which is able to obtain a conductive paste having a high thixotropic ratio and a high Casson yield value and which is able to form a conductive pattern having a low resistance, and a method for producing the same. An aliphatic amine such as hexadecylamine is added to a silver powder, the surface of which is coated with a fatty acid such as stearic acid, to be stirred and mixed to form the aliphatic amine on the outermost surface of the silver powder while allowing the fatty acid to react with the aliphatic amine to form an aliphatic amide such as hexadecanamide between the fatty acid and the aliphatic amine.
    Type: Application
    Filed: January 2, 2018
    Publication date: June 7, 2018
    Applicant: DOWA ELECTRONICS MATERIALS CO., LTD.
    Inventors: Yoshiyuki Michiaki, Hiroshi Kamiga
  • Patent number: 9984788
    Abstract: There is provided a silver powder, which is able to obtain a conductive paste having a high thixotropic ratio and a high Casson yield value and which is able to form a conductive pattern having a low resistance, and a method for producing the same. An aliphatic amine such as hexadecylamine is added to a silver powder, the surface of which is coated with a fatty acid such as stearic acid, to be stirred and mixed to form the aliphatic amine on the outermost surface of the silver powder while allowing the fatty acid to react with the aliphatic amine to form an aliphatic amide such as hexadecanamide between the fatty acid and the aliphatic amine.
    Type: Grant
    Filed: July 24, 2015
    Date of Patent: May 29, 2018
    Assignee: Dowa Electronics Materials Co., Ltd.
    Inventors: Yoshiyuki Michiaki, Hiroshi Kamiga
  • Publication number: 20170259333
    Abstract: A silver powder, including: an organic substance on a surface of the silver powder, the organic substance containing at least one carboxyl group and at least one hydroxyl group in one molecule of the organic substance, wherein a ratio of (Casson yield value/BET specific surface area) is 500 or less, where the Casson yield value is a Casson yield value of a conductive paste and the BET specific surface area is a BET specific surface area of the silver powder, where the conductive paste has a composition in which the silver powder is 86% by mass, a glass fit is 1% by mass, ethyl cellulose is 0.6% by mass, texanol is 10.5% by mass, and zinc oxide is 1.9% by mass, and the conductive paste is prepared by kneading the composition with a planetary centrifugal stirrer and bubble remover and dispersing with a triple roll mill.
    Type: Application
    Filed: July 27, 2015
    Publication date: September 14, 2017
    Inventors: Taro Nakanoya, Hiroshi Kamiga
  • Publication number: 20170259334
    Abstract: A silver powder, including: an organic substance on a surface of the silver powder, the organic substance containing at least one carboxyl group and at least one hydroxyl group in one molecule of the organic substance, wherein a BET specific surface area of the silver powder is 0.1 m2/g or more but 2.0 m2/g or less, and wherein a cumulative 50% point of particle diameter (D50) of the silver powder in a volume-based particle size distribution of the silver powder as measured by a laser diffraction particle size distribution analysis is 0.1 ?m or more but 6.0 ?m or less, and a ratio of [(D90?D10)/D5o] is 3.0 or less, where D50 is the cumulative 50% point of particle diameter, D90 is a cumulative 90% point of particle diameter of the silver powder, and D10 is a cumulative 10% point of particle diameter of the silver powder.
    Type: Application
    Filed: July 27, 2015
    Publication date: September 14, 2017
    Applicant: DOWA Electronics Materials Co., Ltd.
    Inventors: Taro Nakanoya, Hiroshi Kamiga
  • Publication number: 20170232510
    Abstract: There is provided a silver-coated copper powder, which has excellent storage stability (reliability), and a method for producing the same. A silver-coated copper powder obtained by coating the surface of a copper powder, which is obtained by the atomizing method or the like, with 5 wt % or more (with respect to the silver-coated copper powder) of a silver containing layer of silver or a silver compound, is added to a gold plating solution, which is a potassium gold cyanide solution (to which at least one of tripotassium citrate monohydrate, anhydrous citric acid and L-aspartic acid is preferably added), to cause 0.01 wt % or more (with respect to the silver-coated copper powder) of gold to be supported on the surface of the copper powder coated with the silver containing layer.
    Type: Application
    Filed: August 21, 2015
    Publication date: August 17, 2017
    Applicant: Dowa Electronics Materials Co., Ltd.
    Inventors: Noriaki Nogami, Hiroshi Kamiga