Patents by Inventor Takao Uematsu

Takao Uematsu 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: 6632780
    Abstract: There are provided a highly thermal conductive grease composition having both a thermal conductivity and a satisfactory dispense property, and a cooling device applied with same. The grease composition comprises from 70 to 90% by volume of an inorganic powder which is a mixture containing at least two kinds of inorganic powders different from each other in each average particle size, and from 10 to 30% by volume of a base oil containing a mineral oil or a synthetic oil, the base oil further containing a surfactant in an amount of from 0.2 to 2.0% by weight based on the weight of the inorganic powder.
    Type: Grant
    Filed: March 5, 2001
    Date of Patent: October 14, 2003
    Assignee: Hitachi, Ltd.
    Inventors: Takao Uematsu, Yutaka Ito, Takahiro Daikoku, Akio Idei, Akihiro Yasuda
  • Publication number: 20030008961
    Abstract: There are provided a highly thermal conductive grease composition having both a thermal conductivity and a satisfactory dispense property, and a cooling device applied with same. The grease composition comprises from 70 to 90% by volume of an inorganic powder which is a mixture containing at least two kinds of inorganic powders different from each other in each average particle size, and from 10 to 30% by volume of a base oil containing a mineral oil or a synthetic oil, the base oil further containing a surfactant in an amount of from 0.2 to 2.0% by weight based on the weight of the inorganic powder.
    Type: Application
    Filed: March 5, 2001
    Publication date: January 9, 2003
    Inventor: Takao Uematsu
  • Patent number: 5612424
    Abstract: A fiber-reinforced resin composition, which comprises:an epoxy resin having at least two epoxy groups in the molecule,a polymerizable unsaturated group-containing epoxy compound of the following general formula [I], ##STR1## wherein R.sup.1 is H or CH.sub.3, R.sup.2 is an alkylene group having 1 to 20 carbon atoms, and n is an integer of 0 to 20,a liquid carboxylic acid anhydride containing a monofunctional carboxylic acid anhydride and/or a polyfunctional carboxylic acid anhydride obtained by reacting a lower aliphatic polyhydric alcohol with a trimellitic acid or a derivative thereof,a curing promoter,a radical polymerization initiator, anda fiber,the glass transition temperature (Tg, .degree.C.) and breaking strain (E, %) of a cured product of said composition satisfying the following formulae:Tg.gtoreq.-17E+240E.gtoreq.4, andTg.gtoreq.125.
    Type: Grant
    Filed: August 18, 1994
    Date of Patent: March 18, 1997
    Assignee: Mitsubishi Chemical Industries, Ltd.
    Inventors: Shoichi Sato, Tohru Imanara, Takao Uematsu
  • Patent number: 5549835
    Abstract: Disclosed are an apparatus having sliding parts and a compound for preventing diffusion or separation of a base oil; and a compound for preventing diffusion or separation of the base oil used for the apparatus: an electronic or electric appliance using a joul heat generating source, means for taking out joul heat to the outside by sliding with said heat generating source, and heat conducting compound intervenient between said heat taking out means and heat generating source; and the heat conducting compound used for the appliance.
    Type: Grant
    Filed: October 19, 1995
    Date of Patent: August 27, 1996
    Assignee: Hitachi, Ltd.
    Inventors: Takao Uematsu, Mitsuyoshi Shoji, Takayuki Nakakawaji, Shigeki Komatsuzaki, Yutaka Ito, Atsushi Morihara, Koji Sato, Shizuo Zushi, Hiroshi Go
  • Patent number: 4803000
    Abstract: A lubricating composition comprising (A) at least one member selected from (a) a polyoxyalkylene alkyl ether phosphate diester, (b) a polyoxyalkylene alkylphenyl ether phosphate diester and (c) a phosphonate ester, in an amount of 3% by weight or more, (B) an N,N'-ethylenebis acid amide having an average particle size of 1 .mu.m or more in an amount of 2 to 15% by weight, and if necessary (C) a lubricating oil having a viscosity of 5 mm.sup.2 /s or more ('.degree. C.) is suitable for cold plastic working of aluminum alloys, particularly age-hardening type aluminum alloys, at the reduction of area of 35% or more.
    Type: Grant
    Filed: June 17, 1986
    Date of Patent: February 7, 1989
    Assignee: Hitachi, Ltd.
    Inventors: Takao Uematsu, Hiroshi Suzuki, Shigeki Komatsuzaki, Fumio Nakano
  • Patent number: 4657685
    Abstract: A substantially water-free, emulsion type liquid lubricant for metal forming which comprises:(a) a lubricating oil,(b) at least one of phosphoric acid esters represented by the general formula: ##STR1## wherein R is alkyl, alkylalkenyl or aryl; n is an integer of 1 to 2, and (c) an emulsifying agent,an average particle size of the phosphoric acid ester being 0.3 to 120 .mu.m, can form a lubricating film having distinguished heat resistance and lubricating properties by virtue of the heat generated by deformation and friction during the metal forming only by wetting the surface of a metallic workpiece or a die or both with the lubricant and work effectively for preventing galling, and thus parts with a high reduction of area or parts of complicated shapes can be readily formed.A lubricating film having a lubricating effect equivalent to that of the conventional phasphate film can be simply obtained, greatly contributing to reduction in product cost.
    Type: Grant
    Filed: December 19, 1984
    Date of Patent: April 14, 1987
    Assignee: Hitachi, Ltd.
    Inventors: Takao Uematsu, Shigeki Komatsuzaki, Fumio Nakano, Tomoe Takamura
  • Patent number: 4612127
    Abstract: A substantially water-free, liquid lubricant for metal forming, which comprises a lubricating oil, and at least one of linearly condensed phosphorus compounds represented by the following general formula (1):M.sub.m H.sub.n+2-m P.sub.n O.sub.3n+1 (1)wherein m is an integer of 0, 1, . . . , n+1, n is an integer of 2 to 6, and M is an alkali metal, and cyclically condensed phosphorus compounds represented by the following general formulae (2) and (3):(HPO.sub.3).sub.n (2)M.sub.x H.sub.y (PO.sub.3).sub.x+y (3)wherein n is an integer of 2 to 8, M is an alkali metal, and each of x and y is an integer of 1 or more, where x+y.ltoreq.
    Type: Grant
    Filed: September 26, 1984
    Date of Patent: September 16, 1986
    Assignee: Hitachi, Ltd.
    Inventors: Takao Uematsu, Shigeki Komatsuzaki, Tomoe Takamura, Fumio Nakano, Toshikazu Narahara
  • Patent number: 4612128
    Abstract: A lubricating composition comprising (a) a lubricating oil, (b) at least one phosphite ester of pentaerythritol, and (c) at least one compound selected from phosphate monoesters and diesters and phosphonates is suitable for metal forming, particularly for plastic working of aluminum and aluminum alloy with excellent formability and heat resistance.
    Type: Grant
    Filed: October 2, 1985
    Date of Patent: September 16, 1986
    Assignee: Hitachi, Ltd.
    Inventors: Takao Uematsu, Hiroshi Suzuki, Shigeki Komatsuzaki, Fumio Nakano
  • Patent number: 4523668
    Abstract: A friction material made of a molded cork, a friction surface of which is covered with a liquid or semi-solid lubricant layer including a solid lubricant layer comprising a solid lubricant having a larger particle size and a solid lubricant having a smaller particle size and filling vacant spaces between the larger-sized solid lubricant in dense form, affords a long service life when used in a power controlling apparatus which can transmit power and/or change rotation speed by applying friction and using a friction material.
    Type: Grant
    Filed: August 4, 1982
    Date of Patent: June 18, 1985
    Assignee: Hitachi, Ltd.
    Inventors: Takao Uematsu, Yoshiharu Honma, Seikichi Tanno, Ran Ito, Jun Matsubayashi, Tomio Yoshida