Patents by Inventor Yoshinari Ishii

Yoshinari Ishii 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).

  • Publication number: 20120204677
    Abstract: There is provided a novel sintered sliding member superior in thermal resistance, corrosion resistance and wear resistance. The sintered sliding member of the present invention includes 7.7-30.3% Cu, 2.0-20.0% Sn and 0.3-7.0% boron nitride by mass, with a remainder composed of Ni and unavoidable impurities. The sintered sliding member may further include 0.1-3.0% C or 0.1-0.7% P. A porosity of the sintered sliding member is 5-25%.
    Type: Application
    Filed: December 7, 2010
    Publication date: August 16, 2012
    Applicant: Diamet Corporation
    Inventors: Yoshinari Ishii, Tsuneo Maruyama, Yoshiki Tamura
  • Publication number: 20120145284
    Abstract: A Cu-based sintered sliding member that can be used under high-load conditions. The sliding member is age-hardened, including 5 to 30 mass % Ni, 5 to 20 mass % Sn, 0.1 to 1.2 mass % P, and the rest including Cu and unavoidable impurities. In the sliding member, an alloy phase containing higher concentrations of Ni, P and Sn than their average concentrations in the whole part of the sliding member, is allowed to be present in a grain boundary of a metallic texture, thereby achieving excellent wear resistance. Hence, without needing expensive hard particles, there can be obtained, at low cost, a Cu-based sintered sliding member usable under high-load conditions. Even more excellent wear resistance is achieved by containing 0.3 to 10 mass % of at least one solid lubricant selected from among graphite, graphite fluoride, molybdenum disulfide, tungsten disulfide, boron nitride, calcium fluoride, talc and magnesium silicate mineral powders.
    Type: Application
    Filed: August 27, 2010
    Publication date: June 14, 2012
    Applicant: Diamet Corporation
    Inventors: Yoshinari Ishii, Tsuneo Maruyama, Yoshiki Tamura
  • Patent number: 7578866
    Abstract: This iron-based sintered alloy contains 0.05 to 3% by mass of calcium carbonate or 0.05 to 3% by mass of strontium carbonate. As a result, an iron-based sintered alloy having excellent machinability is obtained.
    Type: Grant
    Filed: March 10, 2004
    Date of Patent: August 25, 2009
    Assignee: Mitsubishi Materials PMG Corporation
    Inventors: Kinya Kawase, Yoshinari Ishii
  • Publication number: 20060104848
    Abstract: In a method of manufacturing an Fe-based sintered alloy member having excellent dimensional accuracy, strength, and sliding performance, and having a composition comprising: Cu: 0.5 to 7 wt %; C: 0.1 to 0.98 wt %; oxygen: 0.02 to 0.3 wt %; as needed, Mn: 0.0025 to 1.05 wt % and/or Zn: 0.001 to 0.7 wt %; and a balance of Fe and inevitable impurities by blending and mixing an Fe powder, a graphite powder, and a Cu alloy powder as a base powder and by forming and sintering the resultant mixture, in which the Cu alloy powder blended as the base powder has a composition comprising: Fe: 1 to 10 wt %; oxygen: 0.2 to 1 wt %; as needed, Zn: 0.2 to 10 wt % and/or Mn: 0.5 to 15 wt %; and a balance of Cu and inevitable impurities.
    Type: Application
    Filed: November 18, 2004
    Publication date: May 18, 2006
    Applicant: Mitsubishi Materials Corporation
    Inventors: Kinya Kawase, Yoshinari Ishii
  • Publication number: 20060099079
    Abstract: An iron-based sintered alloy member having a composition consisting of 0.5 to 7% by mass of Cu, 0.1 to 0.98% by mass of C, 0.02 to 0.3% by mass of oxygen and, optionally, 0.0025 to 1.05% by mass of Mn and/or 0.001 to 0.7% by mass of Zn, and the balance of Fe and inevitable impurities is manufactured by formulating an Fe powder, a graphite powder and a Cu alloy powder, as raw powders, mixing the powders to form a powder mixture, forming the powder mixture into a green compact and sintering the green compact. The Cu alloy powder has a composition consisting of 1 to 10% by mass of Fe, 0.2 to 1% by mass of oxygen and, optionally, 0.2 to 10% by mass of Zn and/or 0.5 to 15% by mass of Mn, and the balance of Cu and inevitable impurities.
    Type: Application
    Filed: October 20, 2003
    Publication date: May 11, 2006
    Inventors: Kinya Kawase, Yoshinari Ishii
  • Patent number: 5993732
    Abstract: An R--T--M alloy material, wherein R is at least one rare earth metal including Y, T is Fe or an Fe component partially replaced by Co or Ni, M is B or a B component partially replaced by C as primary components is prepared by heating the alloy at a temperature from room temperature to a specific temperature of less than 500.degree. C. in a non-oxidizing atmosphere and holding it at the given temperature, if necessary; performing hydrogenation by holding the alloy in a hydrogen atmosphere or a mixed gas atmosphere of hydrogen and an inert gas at a specific temperature in the range of 500-1,000.degree. C.; medial annealing the alloy by holding the R--T--M alloy after the hydrogenation step in an inert gas atmosphere at a specific temperature in the range of 500-1,000.degree. C.; and dehydrogenating the alloy by holding the alloy in a vacuum of less than 1 Torr for dehydrogenation, and then cooling the alloy.
    Type: Grant
    Filed: July 13, 1998
    Date of Patent: November 30, 1999
    Assignee: Mitsubishi Materials Corporation
    Inventors: Ryoji Nakayama, Yoshinari Ishii, Norihito Fukatsu, Koichiro Morimoto
  • Patent number: 5417773
    Abstract: The present invention provides a method for producing a rare earth alloy magnet powder exhibiting stable and superior magnetic properties using hydrogenation followed by dehydrogenation. In a method for producing a rare earth alloy magnet powder wherein a homogenized rare earth alloy magnet alloy material is subjected to hydrogenation at a temperature in a range between 750.degree. C. and 950.degree. C., followed by dehydrogenation at a temperature in a range between 750.degree. C. and 950.degree. C.; cooled; and crushed, both the hydrogenation and the dehydrogenation are carried out in a vacuum tube furnace; and the alloy material in the dehydrogenation step maintains a temperature drop of at most 50.degree. C. due to an endothermic reaction which occurs during the dehydrogenation step.
    Type: Grant
    Filed: October 6, 1994
    Date of Patent: May 23, 1995
    Assignee: Mitsubishi Materials Corporation
    Inventors: Ryoji Nakayama, Takuo Takeshita, Yoshinari Ishii, Tamotsu Ogawa
  • Patent number: 5211770
    Abstract: A magnetic recording powder for use as a material for magnetic recording media including magnetic tapes and magnetic cards, the powder having a high coercive force at room temperatures and a low Curie point, consists of at least one element selected from the group consisting of Y and rare-earth elements (R): 5-20 atomic %, B: 5-20 atomic %, Mn: 4-20 atomic %; and Fe and inevitable impurities: the balance. If required, the powder may further contain Al: 1-10 atomic %, and/or Cr: 1-10 atomic %. The powder has a mean particle size of 0.5-2 .mu.m and a mean crystal grain size of 0.1-0.4 .mu.m.
    Type: Grant
    Filed: July 29, 1992
    Date of Patent: May 18, 1993
    Assignees: Mitsubishi Materials Corporation, Nippon Telegraph and Telephone Corporation, Dai Nippon Insatsu Kabushiki Kaisha
    Inventors: Ginya Ishiguro, Kouichi Ishiyama, Yoshinari Ishii, Takuo Takeshita, Hachiro Saito, Yasuaki Yoshioka