Patents by Inventor Takashi Kumai

Takashi Kumai 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: 10323153
    Abstract: [Problem] To provide a corrosion-resistant coating that exhibits greater corrosion protection in saltwater environments and the like than was conventional, a method for forming the same, and a device for forming the same. [Solution] A corrosion-resistant alloy coating is formed on a substrate surface by: a) using a thermal spray gun, having a function wherein a flame including melted material particles is jetted toward a substrate, and the flame is partitioned from the open air in an upstream region on said jet path (which is to say the region in which the material particles are melted), and a function wherein, in a downstream region (the area continuing from the upstream region), the material particles and the flame are forcibly cooled by a jet-gas or jet-mist before reaching the substrate; and b) using a corrosion-resistant alloy material comprising aluminum, for the material particles.
    Type: Grant
    Filed: January 27, 2015
    Date of Patent: June 18, 2019
    Assignee: YOSHIKAWA KOGYO CO., LTD.
    Inventors: Ryurou Kurahashi, Toshiharu Morimoto, Yoshio Shin, Fumiaki Otsubo, Yasuhiro Omori, Takashi Kumai, Yusuke Nishiura, Toshifumi Horita
  • Publication number: 20170015838
    Abstract: [Problem] To provide a corrosion-resistant coating that exhibits greater corrosion protection in saltwater environments and the like than was conventional, a method for forming the same, and a device for forming the same. [Solution] A corrosion-resistant alloy coating is formed on a substrate surface by: a) using a thermal spray gun, having a function wherein a flame including melted material particles is jetted toward a substrate, and the flame is partitioned from the open air in an upstream region on said jet path (which is to say the region in which the material particles are melted), and a function wherein, in a downstream region (the area continuing from the upstream region), the material particles and the flame are forcibly cooled by a jet-gas or jet-mist before reaching the substrate; and b) using a corrosion-resistant alloy material comprising aluminum, for the material particles.
    Type: Application
    Filed: January 27, 2015
    Publication date: January 19, 2017
    Inventors: Ryurou KURAHASHI, Toshiharu MORIMOTO, Yoshio SHIN, Fumiaki OTSUBO, Yasuhiro OMORI, Takashi KUMAI, Yusuke NISHIURA, Toshifumi HOTTA
  • Patent number: 8114527
    Abstract: A highly corrosion-resistant, rust-prevention coating material comprising: an inorganic binder; and Zn metal particles comprised of Zn and unavoidable impurities and dispersed in the binder at the rate of 30 mass % or greater based on a dry coating film, wherein (i) the Zn metal particles include (i-1) fine-grain Zn metal particles of 0.05 to 5 ?m peak grain diameter whose grain-diameter distribution has a grain-diameter frequency distribution with a single peak and a tail on either side of the peak and (i-2) coarse-grain Zn metal particles of 6 to 100 ?m peak grain diameter whose grain-diameter distribution has a grain-diameter frequency distribution with another single peak and a tail on either side of the peak, and wherein (ii) the percentage of all Zn metal particles accounted for by Zn metal particles of 0.05 to 5 ?m grain diameter expressed in volume percentage is 5 to 99%.
    Type: Grant
    Filed: September 26, 2007
    Date of Patent: February 14, 2012
    Assignee: Nippon Steel Corporation
    Inventors: Makoto Nagasawa, Minoru Ito, Michio Kaneko, Kenji Katoh, Shiro Imai, Masatoshi Kominami, Toshiro Terakawa, Takashi Kumai
  • Patent number: 8105699
    Abstract: Zn alloy particles for high corrosion resistance rust prevention paint containing, by mass %, Mg: 0.01 to 30% and having a balance of Zn and unavoidable impurities, having physical fracture facets and/or cracks of a length of 0.01 ?m or more or cracks of a depth of 0.01 ?m or more, having an average particle size of 0.05 to 200 ?m, and having an aspect ratio of maximum size and minimum size (maximum size/minimum size) of an average value of 1 to 1.5. Also, a high corrosion resistance rust prevention paint containing these Zn alloy particles and a high corrosion resistance steel material and steel structure coated with that paint.
    Type: Grant
    Filed: September 7, 2007
    Date of Patent: January 31, 2012
    Assignee: Nippon Steel Corporation
    Inventors: Kenji Katoh, Makoto Nagasawa, Minoru Ito, Michio Kaneko, Shiro Imai, Masatoshi Kominami, Toshiro Terakawa, Takashi Kumai
  • Publication number: 20100247956
    Abstract: Zn alloy particles for high corrosion resistance rust prevention paint containing, by mass %, Mg: 0.01 to 30% and having a balance of Zn and unavoidable impurities, having physical fracture facets and/or cracks of a length of 0.01 ?m or more or cracks of a depth of 0.01 ?m or more, having an average particle size of 0.05 to 200 ?m, and having an aspect ratio of maximum size and minimum size (maximum size/minimum size) of an average value of 1 to 1.5. Also, a high corrosion resistance rust prevention paint containing these Zn alloy particles and a high corrosion resistance steel material and steel structure coated with that paint.
    Type: Application
    Filed: September 7, 2007
    Publication date: September 30, 2010
    Inventors: Kenji Katoh, Makoto Nagasawa, Minoru Ito, Michio Kaneko, Shiro Imai, Masatoshi Kominami, Toshiro Terakawa, Takashi Kumai
  • Publication number: 20100028658
    Abstract: A highly corrosion-resistant, rust-prevention coating material comprising: an inorganic binder; and Zn metal particles comprised of Zn and unavoidable impurities and dispersed in the binder at the rate of 30 mass % or greater based on a dry coating film, wherein (i) the Zn metal particles include (i-1) fine-grain Zn metal particles of 0.05 to 5 ?m peak grain diameter whose grain-diameter distribution has a grain-diameter frequency distribution with a single peak and a tail on either side of the peak and (i-2) coarse-grain Zn metal particles of 6 to 100 ?m peak grain diameter whose grain-diameter distribution has a grain-diameter frequency distribution with another single peak and a tail on either side of the peak, and wherein (ii) the percentage of all Zn metal particles accounted for by Zn metal particles of 0.05 to 5 ?m grain diameter expressed in volume percentage is 5 to 99%.
    Type: Application
    Filed: September 26, 2007
    Publication date: February 4, 2010
    Inventors: Makoto Nagasawa, Minoru Ito, Michio Kaneko, Kenji Katoh, Shiro Imai, Masatoshi Kominami, Toshiro Terakawa, Takashi Kumai