Patents by Inventor Takahiko Watai

Takahiko Watai 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: 8936688
    Abstract: An aluminum alloy casting material for heat conducting is provided, wherein the thermal conductivity is improved of an aluminum alloy casting material whereof the castability is improved by the addition of silicon where said invention is characterized by being an aluminum alloy casting material with excellent thermal conductivity, comprising 5-10.0% by mass of silicon, 0.1-0.5% by mass of magnesium and the remainder comprising aluminum and inevitable impurities, and whereon aging treatment has been performed.
    Type: Grant
    Filed: January 3, 2012
    Date of Patent: January 20, 2015
    Assignee: Nippon Light Metal Company, Ltd.
    Inventors: Hiroshi Horikawa, Sanji Kitaoka, Masahiko Shioda, Toshihiro Suzuki, Takahiko Watai, Hidetoshi Kawada
  • Publication number: 20120168041
    Abstract: An aluminum alloy casting material for heat conducting is provided, wherein the thermal conductivity is improved of an aluminum alloy casting material whereof the castability is improved by the addition of silicon where said invention is characterized by being an aluminum alloy casting material with excellent thermal conductivity, comprising 5-10.0% by mass of silicon, 0.1-0.5% by mass of magnesium and the remainder comprising aluminum and inevitable impurities, and whereon aging treatment has been performed.
    Type: Application
    Filed: January 3, 2012
    Publication date: July 5, 2012
    Applicant: NIPPON LIGHT METAL COMPANY, LTD.
    Inventors: Hiroshi HORIKAWA, Sanji KITAOKA, Masahiko SHIODA, Toshihiro SUZUKI, Takahiko WATAI, Hidetoshi KAWADA
  • Publication number: 20110132504
    Abstract: An aluminum alloy casting material for heat conduction obtained by adding Si to an aluminum alloy casting material with enhanced castability thereby realize enhancement of thermal conductivity. There is provided an aluminum alloy casting material excelling in heat conduction. characterized in that it comprises 5 to 10.0 mass % of Si, 0.1 to 0.5 mass % of Mg and the balance of Al and unavoidable impurities, the aluminum alloy casting material having undergone an aging treatment. Further, there is provided a cast aluminum alloy casting material that while having castability and mechanical strength equivalent to or higher than those of conventional cast aluminum alloys, is also enhanced in heat conduction; and provided a process for producing the cast aluminum alloy. In particular, there are provided a cast aluminum alloy and process for producing the same, wherein Si is contained in an amount of 6.0 to 8.0 mass %, the elements other than Si and Al each in simple form in an amount of ?0.
    Type: Application
    Filed: April 5, 2005
    Publication date: June 9, 2011
    Applicant: NIPPON LIGHT METAL COMPANY, LTD.
    Inventors: Hiroshi Horikawa, Sanji Kitaoka, Masahiko Shioda, Toshihiro Suzuki, Takahiko Watai, Hidetoshi Kawada
  • Patent number: 6663729
    Abstract: An aluminum alloy foil is formed from an alloy containing about 1.2 to 1.7% by weight Fe and about 0.35 to 0.80% by weight Si, with the balance aluminum and incidental impurities. The alloy is continuously strip cast to form a strip having a thickness less than about 25 mm, which is then cold rolled to interanneal gauge and interannealed at a temperature of at least 400° C. The interannealed strip is cold rolled and further annealed to form the final foil product, having excellent rollability combined with high strength of the final foil.
    Type: Grant
    Filed: February 13, 2001
    Date of Patent: December 16, 2003
    Assignee: Alcan International Limited
    Inventors: Iljoon Jin, Kevin Gatenby, Christopher Gabryel, Toshiya Anami, Takahiko Watai, Ichiro Okamoto
  • Publication number: 20020153068
    Abstract: An aluminum alloy foil is formed from an alloy containing about 1.2 to 1.7% by weight Fe and about 0.35 to 0.80% by weight Si, with the balance aluminum and incidental impurities. The alloy is continuously strip cast to form a strip having a thickness less than about 25 mm, which is then cold rolled to interanneal gauge and interannealed at a temperature of at least 400° C. The interannealed strip is cold rolled and further annealed to form the final foil product, having excellent rollability combined with high strength of the final foil.
    Type: Application
    Filed: February 13, 2001
    Publication date: October 24, 2002
    Inventors: Iljoon Jin, Kevin Gatenby, Christopher Gabryel, Toshiya Anami, Takahiko Watai, Ichiro Okamoto
  • Patent number: 6106641
    Abstract: A continuous-cast and cold-rolled aluminum alloy sheet for a cross fin, characterized by a chemical composition consisting of not less than 0.05 wt % and less than 0.30 wt % Fe, more than 0.03 wt % and less than 0.10 wt % Mn, an amount of a grain refining agent, and the balance of Al and unavoidable impurities including less than 0.15 wt % Si; a microstructure substantially composed of subgrains; and an electrical conductivity of 55% IACS or more. The aluminum alloy sheet is advantageously produced by a process including the steps of continuous-casting an aluminum alloy melt having the above-mentioned chemical composition to form a cast sheet having a sheet thickness of not more than 30 mm; cold-rolling the cast sheet at a reduction of 90% or more, followed by a temper annealing at a temperature of from 250 to 300.degree. C. for a holding time of 2 hours or more.
    Type: Grant
    Filed: April 9, 1998
    Date of Patent: August 22, 2000
    Assignee: NipponLight Metal Company, Ltd.
    Inventors: Yasuhisa Nishikawa, Takahiko Watai