Patents Assigned to Furukawa Aluminum Co., Ltd.
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Patent number: 4840685Abstract: An aluminum alloy for the substrate of magnetic disk is disclosed, wherein 2 to 6 wt % of Mg and further either one or two of Cu within a range of 0.12 to 2.0 wt % and Zn within a range of 0.28 to 7.0 wt % are contained, and the remainder comprises of Al and inevitable impurities.Type: GrantFiled: April 13, 1988Date of Patent: June 20, 1989Assignee: Furukawa Aluminum Co., Ltd.Inventor: Motohiro Nabae
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Patent number: 4829799Abstract: A method of manufacturing a substrate for a memory disk characterized in that a blank material comprising a non-magnetic metal substrate covered with a non-magnetic metal as an underlayer is subjected to a coining operation by two dies, i.e. upper and lower dies each having flat compressing surface and a certain kind of textured design formed thereon within an apparatus including a mandrel and a die ring arranged to limit the spreading extent of the material whereby a surface having ultra-preciseness and simultaneously impressed texture design is obtained.Type: GrantFiled: October 27, 1987Date of Patent: May 16, 1989Assignees: Furukawa Aluminum Co., Ltd., Kawasaki Steel Corp., C. Itoh & Co., Ltd.Inventors: Thomas U. Coe, Atsushi Yamazaki, Chris Krishnan
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Patent number: 4825680Abstract: A method for manufacturing a metal substrate for a memory disk wherein a metal blank material (6) is sandwiched between two dies within a metal mould (3) limiting the extent to which the material spreads, using a core member (4) if necessary, each of the dies having a flat and smooth working surface, the compression force and sheet gauge reduction ratio being regulated or the surface roughness and amount of coating lubricants employed being regulated.Type: GrantFiled: October 27, 1987Date of Patent: May 2, 1989Assignees: Furukawa Aluminum Co., Ltd., Kawasaki Steel Corp., C. Itoh & Co., Ltd.Inventors: Thomas U. Coe, Atsushi Yamazaki
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Patent number: 4823578Abstract: A method of manufacturing a substrate for a memory disk characterized in that a blank material comprising a non-magnetic metal substrate covered with a non-magnetic metal as an underlayer is subjected to a coining operation by two dies having flat compressing surfaces within an apparatus including a mandrel and a die ring arranged to limit the spreading extent of the material whereby a surface having ultra-preciseness is obtained.Type: GrantFiled: October 27, 1987Date of Patent: April 25, 1989Assignees: Furukawa Aluminum Co., Ltd., Kawasaki Steel Corp., C. Itoh & Co., Ltd.Inventors: Thomas U. Coe, Atsushi Yamazaki, Chris Krishnan
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Patent number: 4822715Abstract: An aluminum alloy support for lithographic printing plate comprising 0.05 to 0.5 wt. % of Fe, 0.1 to 0.9 wt. % of Mg, 0.01 to 0.3 wt % of V and/or Ni, not more than 0.2 wt. % of Si, not more than 0.05 wt. % of Cu and the remainder of Al and inevitable impurities is disclosed. In addition, 0.01-0.3 wt. % of Zr and/or 0.05-2 wt. % of Mn may be contained.Type: GrantFiled: March 30, 1987Date of Patent: April 18, 1989Assignees: Furukawa Aluminum Co., Ltd., Fuji Photo Film Co., Ltd.Inventors: Ryo Shoji, Chozo Fujikura, Kazushige Takizawa, Hirokazu Sakaki
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Patent number: 4749627Abstract: Al and Al alloy materials for a fin are disclosed which contain Fe of 0.2% or less and Si of 0.1% or less and exhibit improved thermal conductivity, sacrificial anode effect and sagging resistance. Also, a heat exchanger having a fin made of the Al and Al alloy material incorporated therein is disclosed. The heat exchanger is lightweight and excellent in corrosion resistance and heat radiation.Type: GrantFiled: February 27, 1985Date of Patent: June 7, 1988Assignees: Furukawa Aluminum Co., Ltd., Sanden CorporationInventors: Kazunori Ishikawa, Hiroshi Kawase, Tooru Yamaguchi, Mikio Koisuka, Toshio Aoki
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Patent number: 4732311Abstract: A method of producing a lightweight and corrosion-resistant heat exchanger is disclosed. An aluminum tube with a plurality of passage bores therein is formed by extrusion. A layer of a brazing material comprising an aluminum alloy having an electrode potential value lower than that of the tube material is formed on the tube surface with the aid of a non-corrosive flux. The tube is bent into a zigzag winding form so as to have a plurality of substantially parallel runs. Corrugated fin members of aluminum or aluminum alloy are placed between respective adjacent runs of the tube. The tube and the fin members are heated together up to the melting point of the brazing material so that they are bonded together by the brazing material to form the heat exchanger.Type: GrantFiled: January 21, 1987Date of Patent: March 22, 1988Assignees: Nippondenso Co., Ltd., Furukawa Aluminum Co., Ltd.Inventors: Yoshiharu Hasegawa, Yutaka Murakami, Toshio Ohara
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Patent number: 4678547Abstract: An anodized memory disk substrate is disclosed, which is characterized in having an anodic film having excellent heat resistance and hardness and having a thickness of not less than 3 .mu.m on the surface of aluminum or an aluminum alloy substrate imparted thereto by means of chromic acid-sulfuric acid mixture. The method described therefor is that, after the formation of anodic film having a film thickness of not less than 4 .mu.m on the surface of substrate, polishing is carried out so as to leave behind the anodic film having a film thickness of at least 3 .mu.m. Heat treatment may be made before or after the polishing.Type: GrantFiled: September 4, 1986Date of Patent: July 7, 1987Assignee: Furukawa Aluminum Co., Ltd.Inventors: Mitsuya Miyamoto, Yasuyuki Ooseki, Motohiro Nabae
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Patent number: 4631949Abstract: A method of loading billet in the indirect extruding press for an alignment of the billet in which, after the billet (10) is held between the dummy block (11) at the side of the extruding stem (4) and the surface of the dies (6) of the dies stem (3), the container (1) is moved toward the side of the billet (10), thereby preventing the blockage of the billet and enabling the obtaining of pipes of a good roundness precision and a reduction in the thickness deflecting ratio of the pipes.Type: GrantFiled: October 2, 1985Date of Patent: December 30, 1986Assignee: Furukawa Aluminum Co., Ltd.Inventors: Masahiro Iwata, Teruhito Shirai, Toshio Watanabe
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Patent number: 4435230Abstract: An aluminum alloy plate for printing is composed of 0.05-0.30% Mg, 0.05-0.30% Si, 0.15-0.30% Fe and the remainder Al and ordinary impurities. This printing plate is manufactured through the steps of subjecting an aluminum alloy ingot of this composition to a thermal soaking treatment; carrying out a hot rolling process; then carrying out a cold rolling process on the hot rolled alloy at least at a reduction of 70%; and carrying out low temperature annealing at a temperature of 150.degree.-250.degree. C. for at least one hour.Type: GrantFiled: August 20, 1982Date of Patent: March 6, 1984Assignee: Furukawa Aluminum Co., Ltd.Inventor: Chozo Fujikura
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Patent number: 4410036Abstract: A heat exchanger made of aluminum alloys comprising a tube made of an aluminum alloy consisting of 0.2 to 1.0 wt % of Cu and the balance Al and inevitable impurities, and fins jointed to the tube, at least a portion of each fin being formed from another aluminum alloy exhibiting and electrochemical potential value lower than that of the aluminum alloy from which the tube is made, so as to provide a sacrificial corrosion effect. Disclosed also is an aluminum alloy material having superior hot-extrusion characteristics and pitting corrosion resistance suitable for use as the material of heat exchanger tubes, the aluminum alloy material consisting of 0.2 to 1.0 wt % of Cu and the balance Al and inevitable impurities.Type: GrantFiled: September 24, 1981Date of Patent: October 18, 1983Assignees: Nippondenso Co., Ltd., Furukawa Aluminum Co., Ltd.Inventors: Kenso Kanada, Yoshiharu Hasegawa, Hiroshi Kawase, Kazunori Ishikawa
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Patent number: 4202709Abstract: A method for manufacturing an aluminum or aluminum alloy clad steel sheet in an easy, economical manner. An aluminized steel sheet obtained by applying aluminum or an aluminum alloy to a steel sheet by hot dipping is heated to a temperature between 100.degree. and 550.degree. C. Then, an aluminum or aluminum alloy sheet having its bonding face cleaned and having room temperature is superposed on one side or each of two sides of the aluminized steel sheet. The superposed sheets are rolled together to a draft reduction percentage of 10 to 40% to roll bond the aluminum or aluminum alloy sheet or sheets with the aluminized steel sheet. Then, if desired, the roll bonded sheets are further subjected to either one or both of finish rolling and/or a softening treatment. An aluminum or aluminum alloy clad steel sheet thus obtained has excellent strength, corrosion resistance and bending formability.Type: GrantFiled: March 12, 1979Date of Patent: May 13, 1980Assignee: Furukawa Aluminum Co., Ltd.Inventors: Seiji Shibamori, Yoji Ishida
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Patent number: 4172923Abstract: This invention relates to a composite material for vacuum brazing comprising a cladding material for vacuum brazing composed of 0.1-2.0 wt. % of zinc, 0.01-2.0 wt. % of at least one member selected from the group consisting of calcium, sodium and potassium and the balance of aluminum, and a core material consisting of aluminum or an aluminum alloy having said cladding material clad onto one surface of both surfaces thereof.Type: GrantFiled: June 12, 1978Date of Patent: October 30, 1979Assignee: Furukawa Aluminum Co., Ltd.Inventors: Hiroshi Kawase, Motoyoshi Yamaguchi
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Patent number: 4172181Abstract: This invention relates to a composite material for vacuum brazing comprising a cladding material for vacuum brazing composed of 0.1-2.0 wt. % of zinc, 0.01-2.0 wt. % of lithium and the balance of aluminum, and a core material consisting of aluminum or an aluminum alloy having said cladding material clad onto one surface of both surfaces thereof.Type: GrantFiled: May 2, 1978Date of Patent: October 23, 1979Assignee: Furukawa Aluminum Co., Ltd.Inventors: Hiroshi Kawase, Motoyoshi Yamaguchi, Mitsuya Miyamoto