Patents by Inventor Hiroko Nakayama

Hiroko Nakayama 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: 11365154
    Abstract: A silicon nitride-based sintered body containing silicon nitride-based grains, which are silicon nitride grains or sialon grains. In the silicon nitride-based sintered body, when the size of each silicon nitride-based grain is represented by its maximum grain size, the ratio of the number of silicon nitride-based grains having a maximum grain size of 1 ?m or less to the number of the entire silicon nitride-based grains is 70% or higher. Furthermore, in the distribution profile of no. % of silicon nitride-based grains with respect to maximum grain size, the maximum value of no. % (i.e., maximum no. %) of silicon nitride-based grains is 15 no. % or higher. Also disclosed is a cutting insert, which is formed of the silicon nitride-based sintered body.
    Type: Grant
    Filed: March 30, 2017
    Date of Patent: June 21, 2022
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Hiroko Nakayama, Atsushi Komura
  • Publication number: 20210155550
    Abstract: A silicon nitride-based sintered body containing silicon nitride-based grains, which are formed of sialon grains. In the silicon nitride-based sintered body, when the size of each silicon nitride-based grain is represented by its maximum grain size, the ratio of the number of silicon nitride-based grains having a maximum grain size of 1 ?m or less to the number of the entire silicon nitride-based grains is 70% or higher. Furthermore, in the distribution profile of no. % of silicon nitride-based grains with respect to maximum grain size, the maximum value of no. % (i.e., maximum no. %) of silicon nitride-based grains is 15 no. % or higher. Also disclosed is a cutting insert, which is formed of the silicon nitride-based sintered body.
    Type: Application
    Filed: February 5, 2021
    Publication date: May 27, 2021
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Hiroko NAKAYAMA, Atsushi KOMURA
  • Publication number: 20200299199
    Abstract: A silicon nitride-based sintered body containing silicon nitride-based grains, which are silicon nitride grains or sialon grains. In the silicon nitride-based sintered body, when the size of each silicon nitride-based grain is represented by its maximum grain size, the ratio of the number of silicon nitride-based grains having a maximum grain size of 1 ?m or less to the number of the entire silicon nitride-based grains is 70% or higher. Furthermore, in the distribution profile of no. % of silicon nitride-based grains with respect to maximum grain size, the maximum value of no. % (i.e., maximum no. %) of silicon nitride-based grains is 15 no. % or higher. Also disclosed is a cutting insert, which is formed of the silicon nitride-based sintered body.
    Type: Application
    Filed: March 30, 2017
    Publication date: September 24, 2020
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Hiroko NAKAYAMA, Atsushi KOMURA
  • Patent number: 8808414
    Abstract: The present invention provides a technique of improving wear resistance of a Sialon sintered body. The Sialon sintered body has a Sialon phase including at least a ?-Sialon and a 12H-Sialon among an ?-Sialon, the ?-Sialon and the 12H-Sialon. A ratio of a second Sialon total content, which is a sum of the contents of the ?-Sialon and the 12H-Sialon, to a first Sialon total content, which is a sum of contents of the ?-Sialon, the ?-Sialon and the 12H-Sialon, is greater than 20% and not greater than 55%, and a ratio of the content of the 12H-Sialon to the first Sialon total content is not less than 2% and not greater than 55%.
    Type: Grant
    Filed: March 11, 2010
    Date of Patent: August 19, 2014
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Hiroko Nakayama, Ryoji Toyoda
  • Publication number: 20120066981
    Abstract: The present invention provides a technique of improving wear resistance of a Sialon sintered body. The Sialon sintered body has a Sialon phase including at least a ?-Sialon and a 12H-Sialon among an ?-Sialon, the ?-Sialon and the 12H-Sialon. A ratio of a second Sialon total content, which is a sum of the contents of the ?-Sialon and the 12H-Sialon, to a first Sialon total content, which is a sum of contents of the ?-Sialon, the ?-Sialon and the 12H-Sialon, is greater than 20% and not greater than 55%, and a ratio of the content of the 12H-Sialon to the first Sialon total content is not less than 2% and not greater than 55%.
    Type: Application
    Filed: March 11, 2010
    Publication date: March 22, 2012
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Hiroko Nakayama, Ryoji Toyoda
  • Publication number: 20110239363
    Abstract: An automatic hair washing machine including a sink in which a head portion of a user is laid, the sink having an enclosed space that is formed when the head portion is laid in the sink, a nozzle link unit for jetting liquid containing at least one of washing water and cleaning agent liquid, and a mist spraying unit for spraying mist into the enclosed space.
    Type: Application
    Filed: March 25, 2011
    Publication date: October 6, 2011
    Applicants: SANYO ELECTRIC CO., LTD., SANYO AQUA CORPORATION, TAKARA BELMONT CORPORATION
    Inventors: Shuhei Nagamatsu, Akira Yamaguchi, Masashi Furusawa, Kazushige Murakami, Masaru Iwasaki, Kazuhide Yamamoto, Mayumi Okazaki, Hiroko Nakayama, Yosuke Shimizu
  • Patent number: 7951737
    Abstract: A cutting insert 1 is made of an aluminum oxide-based composite sintered body constituted by a ternary ceramic material including aluminum oxide, silicon carbide, and a sialon. The sialon in the aluminum oxide-based composite sintered body is Si—Al—O—N as defined by JCPDS No. 32-0026 in X-ray diffraction analysis.
    Type: Grant
    Filed: August 29, 2007
    Date of Patent: May 31, 2011
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Hiroko Nakayama, Kazuhiro Urashima
  • Publication number: 20090197073
    Abstract: A cutting insert 1 is made of an aluminum oxide-based composite sintered body constituted by a ternary ceramic material including aluminum oxide, silicon carbide, and a sialon. The sialon in the aluminum oxide-based composite sintered body is Si—Al—O—N as defined by JCPDS No. 32-0026 in X-ray diffraction analysis.
    Type: Application
    Filed: August 29, 2007
    Publication date: August 6, 2009
    Inventors: Hiroko Nakayama, Kazuhiro Urashima