Patents by Inventor Michio Okabe

Michio Okabe 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: 6193822
    Abstract: Disclosed is a method of manufacturing a diesel engine valve for intake and exhaust having good corrosion resistance and increased valve face strength, and therefore, of improved durability. A Ni-base heat resistant alloy of strong precipitation hardening type or an Fe-base heat resistant alloy of the same type is used as the material. The method comprises hot forging to prepare a blank form of the valve to be manufactured, solution treatment, cold processing to form the face part, and age-treating for increasing the hardness of the face part.
    Type: Grant
    Filed: June 18, 1998
    Date of Patent: February 27, 2001
    Assignee: Daido Steel Co., Ltd.
    Inventors: Tomotaka Nagashima, Michio Okabe, Toshiharu Noda
  • Patent number: 6139660
    Abstract: A high corrosion resisting alloy for use in inlet and exhaust valves of diesel engines which is low in cost and excellent in corrosion resistance and strength, which consists by weight percentage of C.ltoreq.0.1%, Si.ltoreq.1.0%, Mn.ltoreq.1.0%, 25%<Cr.ltoreq.32%, 2.0%<Ti.ltoreq.3.0%, 1.0%.ltoreq.Al.ltoreq.2.0% and the balance being Ni and incidental impurities. The valves for the diesel engines are manufactured through the steps of forging the above-mentioned alloy into near net shapes of the valves, performing aging treatment (after solid solution treatment according to demand), and further enhancing hardness of the valves at their valve faces locally through partial cold forging.
    Type: Grant
    Filed: January 5, 2000
    Date of Patent: October 31, 2000
    Assignees: Daido Tokushuko Kabushiki Kaisha, Nittan Valvle Co., Ltd.
    Inventors: Tomotaka Nagashima, Michio Okabe, Toshiharu Noda, Kiyoshi Okawachi
  • Patent number: 6110421
    Abstract: A non-magnetic stainless steel, which contains stably a large amount of N, is excellent in the corrosion resistance and the strength and possible to obtain sound ingots and products, consists by weight percentage of C.ltoreq.0.08%, Si.ltoreq.0.50%, 13%.ltoreq.Mn.ltoreq.16%, P.ltoreq.0.040%, S.ltoreq.0.030%, 0.35%.ltoreq.Cu.ltoreq.1.00%, 2.50%.ltoreq.Ni.ltoreq.5.50%, 17.0%.ltoreq.Cr.ltoreq.19.0%, 0.5%.ltoreq.Mo+W.ltoreq.1.0%, 0.38%.ltoreq.N.ltoreq.0.60%, 0.ltoreq.0.0100%, sol-Al.ltoreq.0.05% and the balance Fe on condition that86(Ni+Cu).gtoreq.13Cr+19Mo+9W+2Mn.
    Type: Grant
    Filed: September 13, 1999
    Date of Patent: August 29, 2000
    Assignee: Daido Tokushuko Kabushiki Kaisha
    Inventors: Tetsuya Shimizu, Michio Okabe
  • Patent number: 6099668
    Abstract: A method for producing an exhaust valve is described, comprising subjecting a raw material of a specified heat resisting alloy to solid solution treatment; forming a head portion of the exhaust valve from the solution treated raw material through cold working or warm working; joining a stem portion made of martensitic heat resisting steel to said head portion of the exhaust valve; and subjecting the head portion and the stem portion joined with each other to aging treatment.
    Type: Grant
    Filed: July 13, 1998
    Date of Patent: August 8, 2000
    Assignee: Daido Tokushuko Kabushiki Kaisha
    Inventors: Shigeki Ueta, Toshiharu Noda, Michio Okabe
  • Patent number: 6096262
    Abstract: A martensitic heat resisting steel having improved heat resistance, which consists by weight percentage of 0.35%.ltoreq.C.ltoreq.0.60%, 1.0%.ltoreq.Si.ltoreq.2.5%, 0.1%.ltoreq.Mn<1.5%, 7.5%.ltoreq.Cr.ltoreq.13.0%, one or both of 1.0%.ltoreq.Mo.ltoreq.3.0% and 1.0%.ltoreq.W.ltoreq.3.0% so that 1.5%.ltoreq.(Mo+0.5W).ltoreq.3.0%, optionally 0.1%.ltoreq.Nb+Ta.ltoreq.1.0%, 0.1%.ltoreq.V.ltoreq.1.0% and S.ltoreq.0.1%, and the remainder is substantially Fe.
    Type: Grant
    Filed: May 4, 1999
    Date of Patent: August 1, 2000
    Assignee: Daido Tokushuko Kabushiki Kaisha
    Inventors: Shigeki Ueta, Toshiharu Noda, Michio Okabe
  • Patent number: 6039919
    Abstract: A high corrosion resisting alloy for use in inlet and exhaust valves of diesel engines which is low in cost and excellent in corrosion resistance and strength, which consists by weight percentage of C.ltoreq.0.1%, Si.ltoreq.1.0%, Mn.ltoreq.1.0%, 25%<Cr.ltoreq.32%, 2.0%<Ti.ltoreq.3.0%, 1.0%.ltoreq.Al.ltoreq.2.0% and the balance being Ni and incidental impurities. The valves for the diesel engines are manufactured through the steps of forging the above-mentioned alloy into near net shapes of the valves, performing aging treatment (after solid solution treatment according to demand), and further enhancing hardness of the valves at their valve faces locally through partial cold forging.
    Type: Grant
    Filed: February 3, 1998
    Date of Patent: March 21, 2000
    Assignees: Daido Tokushuko Kabushiki Kaisha, Nittan Valve Co., Ltd.
    Inventors: Tomotaka Nagashima, Michio Okabe, Toshiharu Noda, Kiyoshi Okawachi
  • Patent number: 6033625
    Abstract: Improved parts of electronic apparatus made of ferritic free cutting steel, which enjoy high precision in size given by good machinability and free from trouble caused by corrosion of metal due to generation of sulfides. The material steel has an alloy composition consisting essentially of, by weight %, C: up to 0.1%, Si: up to 2.0%, Mn: up to 2.0%, Cr: 19-25% and S: 0.20-0.35% and the balance of Fe and impurities. The parts made by machining can be used without being passivated. The steel may contain, further to the above alloy components, one or more from the following groups: 1) Mo: up to 4.0%; 2) one or more of Pb: up to 0.4%, Bi: up to 0.3%, Te: up to 0.3%, Se: up to 0.4% and Ca: up to 0.3%; 3) one or both of B and Mg: 0.001-0.02%; 4) one or both of Cu and Ni: 0.1-4.0%; 5) one or more of Nb, Ta, Ti, V, W and Al: 0.01-0.50%; and 6) O: 0.01-0.04%.
    Type: Grant
    Filed: November 6, 1998
    Date of Patent: March 7, 2000
    Assignee: Diado Steel Co., Ltd.
    Inventors: Tomotaka Nagashima, Michio Okabe
  • Patent number: 6007301
    Abstract: A turbine rotor consisting of a wheel made of a TiAl alloy of good heat resistance and a rotor shaft made of a steel with good bonding strength is disclosed. As the shaft material a structural steel or a martensitic heat resistant steel is used. A TiAl turbine wheel made by precision casting is butted to the shaft with insertion of a brazing filler in the butted interfaces and stress of 0.01 kgf/mm.sup.2 or higher but lower than yield stress of the shaft is applied on the butted interfaces under heating by high frequency induction heating in atmosphere of an inert gas or a reducing gas to a temperature higher than the liquidus temperature of the brazing metal but not exceeding 100.degree. C. above the liquidus temperature.
    Type: Grant
    Filed: October 17, 1997
    Date of Patent: December 28, 1999
    Assignee: Diado Steel Co., Ltd.
    Inventors: Toshiharu Noda, Michio Okabe, Takao Shimizu
  • Patent number: 5951789
    Abstract: A heat resisting alloy for use in exhaust valves low in price and excellent in the cold workability and possible to be formed into valve shapes through the cold or warm working, which consists by weight percentage of C: 0.01.about.0.1%, Si.ltoreq.2%, Mn.ltoreq.2%, Cr: 12.about.25%, Nb+Ta: 0.2.about.2.0%, Ti.ltoreq.3.5%, Al: 0.5.about.3.0%, Ni: 25.about.45%, Cu: 0.1.about.5.0%, optionally at least one element selected from W.ltoreq.3%, Mo.ltoreq.3%, and V.ltoreq.1% with (1/2W+Mo+V).ltoreq.3%, Co.ltoreq.5% with Ni+Co: 25.about.45%, Ca+Mg: 0.001.about.0.01%, one or both of B.ltoreq.0.01% and Zr: 0.001.about.0.1%, and the balance of Fe and incidental impurities.
    Type: Grant
    Filed: October 22, 1997
    Date of Patent: September 14, 1999
    Assignee: Daido Tokushuko Kabushiki Kaisha
    Inventors: Shigeki Ueta, Toshiharu Noda, Michio Okabe
  • Patent number: 5948182
    Abstract: A heat resisting steel consists essentially of 0.005-0.20% of C, 0.01-2.0% of Si, 0.1-2.0% of Mn, 20-30% of Ni, 10-20% of Cr, 3.0-4.5% of Ti and 0.1-0.7% of Al with the ratio Ti/Al being 5-20, and the balance being substantially Fe, which is excellent in the tensile properties at the room temperature and 700.degree. C., and the creep rupture properties at the temperature of 700.degree. C.
    Type: Grant
    Filed: October 8, 1996
    Date of Patent: September 7, 1999
    Assignee: Daido Tokushuko Kabushiki Kaisha
    Inventors: Shuji Hamano, Tomotaka Nagashima, Michio Okabe, Toshiharu Noda
  • Patent number: 5922274
    Abstract: A titanium alloy having improved heat resistance in addition to the inherent properties of lightness and corrosion resistance. The alloy consists essentially of, by weight %, Al: 5.0-7.0%, Sn: 3.0-5.0%, Zr: 2.5-6.0%, Mo: 2.0-4.0%, Si: 0.05-0.80%, C: 0.001-0.200%, O: 0.05-0.20%, optionally further one or two of Nb and Ta: 0.3-2.0%, and the balance of Ti and inevitable impurities. A method of producing parts from this alloy comprises subjecting the titanium alloy of the above described alloy composition to heat treatment at a temperature of .beta.-region, combination of rapid cooling and slow cooling or combination of water quenching and annealing, hot processing in .alpha.+.beta. region, solution treatment and aging treatment.
    Type: Grant
    Filed: December 22, 1997
    Date of Patent: July 13, 1999
    Assignee: Daido Steel Co., Ltd.
    Inventors: Akihiro Suzuki, Toshiharu Noda, Michio Okabe
  • Patent number: 5779972
    Abstract: A heat resisting alloy of Fe--Cr--Ni type for exhaust valves, knit meshes for the catalyzer and the like which is low in price and excellent in high temperature properties, which consists essentially by weight percentage of C:0.01.about.0.10%, S:.ltoreq.2.0%, Mn .ltoreq.2.0%, Cr:14.about.18%, Nb+Ta:0.5.about.1.5%, Ti:2.0.about.3.0%, Al:0.8.about.1.5%, Ni:30.about.35%,B:0.001.about.0.01%, Ca+Mg:0.001.about.0.01%,Cu.ltoreq.0.5%, P.ltoreq.0.02%, S.ltoreq.0.01%, O.ltoreq.0.01%, N.ltoreq.0.01%, and the balance of Fe, additionally the total atomic percentage of Al, Ti, Nb and Ta:5.0.about.7.0%, and atomic percentage ratio of Ti/Al:1.0.about.1.5, and M-value calculated from the following equation .ltoreq.0.95;M=?0.717 Ni(at. %)+0.858 Fe(at. %)+1.142 Cr(at. %)+1.90 Al(at. %)+2.271 Ti(at. %)+2.117 Nb(at. %)+2.224 Ta(at. %)+1.001 Mn(at. %)+1.90 Si(at. %)!/100.
    Type: Grant
    Filed: April 9, 1997
    Date of Patent: July 14, 1998
    Assignees: Daido Tokushuko Kabushiki Kaisha, Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Toshiharu Noda, Michio Okabe, Katsuaki Sato, Tsutomu Saka
  • Patent number: 5630983
    Abstract: A precipitation hardening stainless steel, which is excellent in cold workability at a solution treated state and good in proof stress after overaging treatment, consists essentially of C.ltoreq.0.010, Ni 0.010.about.0.025% (provided C+N.ltoreq.0.025%), Si.ltoreq.1.0%, Mn.ltoreq.1.2%, P.ltoreq.0.040%, S.ltoreq.0.030%, Cu: 3.0.about.5.0%, Ni: 3.0.about.4.65%, Cr: 13.0.about.16.5%, Mo.ltoreq.1.0%, Nb: (-11.43 (C+N)+0.6).about.0.5% and the balance Fe on condition that452 (C+N)+11.1 (Ni+Mn).ltoreq.73.1.
    Type: Grant
    Filed: April 30, 1996
    Date of Patent: May 20, 1997
    Assignee: Daido Tokushuko Kabushiki Kaisha
    Inventors: Tomonao Tateyama, Tetsuya Shimizu, Michio Okabe