Patents by Inventor Tohei Ototani

Tohei Ototani 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: 5268141
    Abstract: An iron base alloy is disclosed which consists essentially of 0.005%-7.0% of aluminum, 0.005-7.0% of silicon, 0.0001%-0.005% of magnesium, 0.0001-0.005% of calcium, 0.001%-0.002% of oxygen, 0.0001-0.002% of sulphur, and 0.0005%-0.003% of nitrogen, less than 2% of carbon, minor amounts of phosphorous and manganese and the remainder iron.
    Type: Grant
    Filed: May 15, 1991
    Date of Patent: December 7, 1993
    Assignees: Mitsui Engineering and Ship Building Co., Ltd., Metal Research Corporation
    Inventors: Tohei Ototani, Toru Degawa, Kenichi Kusumoto, Makoto Ebata
  • Patent number: 5225156
    Abstract: Disclosed is a clean steel containing less than 30 ppm of oxygen, less than 30 ppm of sulfur, less than 150 ppm of nitrogen, 5 to 0.1 ppm of Mg and 25 to 0.1 ppm of Ca.
    Type: Grant
    Filed: July 19, 1990
    Date of Patent: July 6, 1993
    Assignee: Metal Research Corporation
    Inventor: Tohei Ototani
  • Patent number: 5055018
    Abstract: A clean steel consisting essentially of by weight 0.0005%-0.5% of aluminum, 0.0001%-0.5% of silicon, 0.00001%-0.0005% of magnesium, 0.00001%-0.0025% of calcium, 0.00001%-0.003% of oxygen 0.00001%-0.003% of sulfur and 0.0001%-0.015% of nitrogen, less than 2% carbon and the remainder iron, wherein the clean steel is further selected from the group consisting ofcarbon steel consisting of less than 2% of carbon, and common elements of silicon, manganese, phosphorus or sulfur; andalloy steel consisting of general elements and special elements selected from the group consisting of 0.001%-50% of at least nickel, chromium, cobalt or tungsten.
    Type: Grant
    Filed: March 23, 1990
    Date of Patent: October 8, 1991
    Assignee: Metal Research Corporation
    Inventor: Tohei Ototani
  • Patent number: 4999053
    Abstract: A method of producing an alloy containing at least one major ingredient selected from the group consisting of iron (Fe), cobalt (Co), and Nickel (Ni) and having low contents of sulphur, oxygen, and nitrogen, comprises steps of:(a) holding a molten alloy in a container selected from the group consisting of a lime crucible, a lime crucible furnace, a converter and a ladle lined with a basic refractory consisting of 15-85% of calcium oxide (CaO), and 15-75% of magnesium oxide (MgO), wherein said alloy consists essentially of at least one major ingredient selected from the group consisting of iron (Fe), nickel (Ni), and cobalt (Co);(b) adding at least one additive, based on the molten alloy, into said molten alloy in an atmosphere selected from the group consisting of a non-oxidizing atmosphere and a vacuum, wherein said additive is selected from the group consisting of aluminum (Al), aluminum alloys, silicon and silicon alloys;(c) desulphurizing, deoxidizing and denitrifying said molten alloy under an atmosphere
    Type: Grant
    Filed: November 27, 1989
    Date of Patent: March 12, 1991
    Assignees: Mitsui Engineering and Ship Building Co., Ltd., Metal Research Corporation
    Inventors: Tohei Ototani, Toru Degawa, Kanicki Kusumoto, Makoto Ebata
  • Patent number: 4944798
    Abstract: The disclosed method is a method of manufacturing clean steel comprising refining molten steel by adding additives of from not more than 0.5% to more than 0.001% by weight of molten steel to the molten steel bath, in vacuo or a non-oxidizing atmosphere within a melting furnace or vessel made of or lined with a basic refractory material consisting essentially of 7-90 wt % of CaO and 90-7 wt % of MgO, which total content being 70% to 99.9%, and optionally included a basic refractory material consisting of 30-0.1 wt % of at least one element selected from the group consisting of Al.sub.2 O.sub.3, CrO, ZrO.sub.2.SiO.sub.2, ZrO.sub.2, ZrC and C as selected components, and obtaining clean steel containing less than 30 ppm of oxygen, less than 30 ppm of sulfur, less than 150 ppm of nitrogen, 5 to 0.1 ppm of Mg and 25 to 0.1 ppm of Ca. Said additives comprises Al and at least one optional element selected from Ti, Nb, Ta, B and alkali earth metal. 5% of a solvent can be included to said additives.
    Type: Grant
    Filed: June 7, 1989
    Date of Patent: July 31, 1990
    Assignee: Metal Research Corporation
    Inventor: Tohei Ototani
  • Patent number: 4832742
    Abstract: The disclosed flexible refining agent clad wire comprises a core wire made of refining agent for iron, steel or the like metal, which core wire is clad with a metallic sheath that is made of iron or aluminum, and grooves are formed at certain intervals on the outer surface of the clad wire in a direction lateral or spiral to the longitudinal direction of the refining agent clad wire in such a manner that when the refining agent clad wire is flexed, the grooves are expanded on tension side thereof and contracted on compression side thereof so as to make it flexible.
    Type: Grant
    Filed: May 12, 1988
    Date of Patent: May 23, 1989
    Assignee: Metal Research Corporation
    Inventor: Tohei Ototani
  • Patent number: 4820485
    Abstract: A method of producing an alloy containing at least one major ingredient selected from the group consisting of iron (Fe), cobalt (Co), and Nickel (Ni) and having low contents of sulphur, oxygen, and nitrogen, comprises steps of:(a) holding a molten alloy in a container selected from the group consisting of a lime crucible, a lime crucible furnace, a converter and a ladle lined with a basic refractory consisting of 15-85% of calcium oxide (CaO), and 15-75% of magnesium oxide (MgO), wherein said alloy consists essentially of at least one major ingredient selected from the group consisting of iron (Fe), nickel (Ni), and cobalt (Co);(b) adding at least one additive, based on the molten alloy, into said molten alloy in an atmosphere selected from the group consisting of a non-oxidizing atmosphere and a vacuum, wherein said additive is selected from the group consisting of aluminum (Al), aluminum alloys, silicon and silicon alloys;(c) desulphurizing, deoxidizing and denitrifying said molten alloy under an atmosphere
    Type: Grant
    Filed: February 3, 1987
    Date of Patent: April 11, 1989
    Assignees: Mitsui Engineering and Ship Building Co., Ltd., Metal Research Corporation
    Inventors: Tohei Ototani, Toru Degawa, Kenichi Kusumoto, Makoto Ebata
  • Patent number: 4729787
    Abstract: A method of producing an alloy containing at least one major ingredient selected from the group consisting of iron (Fe), cobalt (Co), and Nickel (Ni) and having low contents of sulphur, oxygen, and nitrogen, comprises steps of:(a) holding a molten alloy in a container selected from the group consisting of a lime crucible, a lime crucible furnace, a converter and a ladle lined with a basic refractory consisting of 15-85% of calcium oxide (CaO), and 15-75% of magnesium oxide (MgO), wherein said alloy consists essentially of at least one major ingredient selected from the group consisting of iron (Fe), nickel (Ni), and cobalt (Co);(b) adding at least one additive, based on the molten alloy, into said molten alloy in an atmosphere selected from the group consisting of a non-oxidizing atmosphere and a vacuum, wherein said additive is selected from the group consisting of aluminum (Al), aluminum alloys, silicon and silicon alloys;(c) desulphurizing, deoxidizing and denitrifying said molten alloy under an atmosphere
    Type: Grant
    Filed: December 3, 1986
    Date of Patent: March 8, 1988
    Assignees: Mitsui Engineering and Ship Building Co., Ltd., Metal Research Corporation
    Inventors: Tohei Ototani, Toru Degawa, Kenichi Kusumoto, Makoto Ebata
  • Patent number: 4710481
    Abstract: Ti or a high-Ti alloy is melted in a container composed of high-purity CaO materials on its inner sides. The materials are composed of not less than 99% by weight of CaO, not more than 0.1% by weight of SiO.sub.2, not more than 0.02% by weight of Fe.sub.2 O.sub.3, and not more than 0.5% by weight in total of other metal oxides under a non-oxidizing atmosphere.CaO refractories for use in the melting of Ti or a high-Ti alloy contains not less than 99% by weight of CaO, not more than 0.1% by weight of SiO.sub.2, 0.02% by weight of Fe.sub.2 O.sub.3, and not more than 0.5% by weight of other metal oxides.
    Type: Grant
    Filed: September 11, 1986
    Date of Patent: December 1, 1987
    Assignee: Mitsui Engineering & Shipbuilding Co., Ltd.
    Inventors: Toru Degawa, Gen Okuyama, Akio Hashimoto, Seiju Uchida, Kouzou Fujiwara, Makoto Ebata, Takashi Satou, Tohei Ototani
  • Patent number: 4698095
    Abstract: Composite calcium materials to be used for welding or refining steel, nickel, nickel alloy or iron alloy, which are produced by cladding a sheath of aluminum, iron or alloys thereof and a core consisting of(1) a mixture or an alloy of calcium or an alloy thereof with at least one element of aluminum and rare earth metals,(2) a mixture of calcium or an alloy thereof with a flux of silicates, oxides or halides of alkaline earth metals, or(3) a mixture consisting of the above described mixture or alloy (1) with the flux as described in the above item (2).
    Type: Grant
    Filed: May 29, 1986
    Date of Patent: October 6, 1987
    Assignee: Tohei Ototani
    Inventors: Tohei Ototani, Yasuji Kataura
  • Patent number: 4671820
    Abstract: Composite calcium materials to be used for welding or refining steel, nickel, nickel alloy or iron alloy, which are produced by cladding a sheath of aluminum, iron or alloys thereof and a core consisting of(1) a mixture or an alloy of calcium or an alloy thereof with at least one element of aluminum and rare earth metals,(2) a mixture of calcium or an alloy thereof with a flux of silicates, oxides or halides of alkaline earth metals, or(3) a mixture consisting of the above described mixture or alloy (1) with the flux as described in the above item (2).
    Type: Grant
    Filed: November 27, 1985
    Date of Patent: June 9, 1987
    Assignee: Tohei Ototani
    Inventors: Tohei Ototani, Yasuji Kataura
  • Patent number: 4484946
    Abstract: The disclosed method of producing an iron-, nickel-, or cobalt-base alloy with low contents of oxygen, sulphur, and nitrogen comprises steps of melting the alloy in a crucible lined with a basic refractory containing at least 40% of calcium oxide; and adding at least one additive and not more than 5% by weight of at least one flux, based on said alloy, the additive being selected from the group consisting of aluminum, aluminum alloys, silicon, silicon alloys, titanium, zirconium, niobium, boron, and rare earth elements, the flux being selected from the group consisting of oxides, silicates, carbonates, and halides of alkali and alkaline earth metals, and aluminum oxide, so that the resultant molten alloy contains 0.005 to 7.0% of aluminum, 0.005 to 7.0% of silicon, and 0.0005 to 0.005% of calcium.
    Type: Grant
    Filed: June 2, 1982
    Date of Patent: November 27, 1984
    Assignee: Metal Research Corporation
    Inventor: Tohei Ototani
  • Patent number: 4097268
    Abstract: Composite calcium materials to be used for welding or refining steel, nickel, nickel alloy or iron alloy, which are produced by cladding a sheath of aluminum, iron or alloys thereof and a core consisting of1. a mixture or an alloy of calcium or an alloy thereof with at least one element of aluminum and rare earth metals,2. a mixture of calcium or an alloy thereof with a flux of silicates, oxides or halides of alkaline earth metals, or3. a mixture consisting of the above described mixture or alloy (1) with the flux as described in the above item (2).
    Type: Grant
    Filed: March 1, 1977
    Date of Patent: June 27, 1978
    Assignee: Tohei Ototani
    Inventors: Tohei Ototani, Yasuji Kataura
  • Patent number: 4094666
    Abstract: A molten iron and steel is refined by feeding a compressed and deformed composite clad obtained by clading a core material of at least one of metallic calcium, metallic magnesium, calcium base alloys and magnesium base alloys with a sheath of iron, into the molten iron and steel at a feeding rate of 20-500 m/min. while deoxidizing, desulfurizing and spherodizing of graphite are effectively carried out.
    Type: Grant
    Filed: May 24, 1977
    Date of Patent: June 13, 1978
    Assignee: Metal Research Corporation
    Inventor: Tohei Ototani
  • Patent number: 4035892
    Abstract: Composite calcium materials to be used for welding or refining steel, nickel, nickel alloy or iron alloy, which are produced by cladding a sheath of aluminum, iron or alloys thereof and a core consisting of1. a mixture or an alloy of calcium or an alloy thereof with at least one element of aluminum and rare earth metals,2. a mixture of calcium or an alloy thereof with a flux of silicates, oxides or halides of alkaline earth metals, or3. a mixture consisting of the above described mixture or alloy (1) with the flux as described in the above item (2).
    Type: Grant
    Filed: July 23, 1975
    Date of Patent: July 19, 1977
    Assignee: Tohei Ototani
    Inventors: Tohei Ototani, Yasuji Kataura