Patents by Inventor Naoto Hiramatsu

Naoto Hiramatsu 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: 20220194376
    Abstract: A vehicle control apparatus includes a detection unit detecting a traveling position and a traveling speed of a subject vehicle and a microprocessor and a memory. The microprocessor is configured to perform acquiring a scheduled switching information of a traffic light located in the traveling direction of the subject vehicle, determining whether to perform a stop operation of stopping the subject vehicle at the road stop line based on the scheduled switching information, the traveling position and the traveling speed, and when it is determined to perform the stop operation, decelerating the subject vehicle at a deceleration equal to or less than a predetermined deceleration until the display mode is switched from the green color mode to the red color and decelerates the subject vehicle so that the subject vehicle stops at the stop line after the display mode is switched to the red color.
    Type: Application
    Filed: December 15, 2021
    Publication date: June 23, 2022
    Inventors: Yohei Kitahara, Naoto Hiramatsu, Yoshimitsu Murahashi
  • Publication number: 20190034397
    Abstract: A non-transitory computer-readable storage medium storing a program that causes a computer to execute a process, the process including receiving an input of locus data of handwriting, determining whether at least one of a velocity and acceleration at a position forward or rearward from a turned-back position in a direction of the handwriting in a locus indicated by the locus data satisfies a first criterion based on the input locus data, and determining whether the received input is a deletion instruction based on whether the first criterion is satisfied.
    Type: Application
    Filed: July 26, 2018
    Publication date: January 31, 2019
    Applicant: FUJITSU LIMITED
    Inventor: Naoto Hiramatsu
  • Publication number: 20090165905
    Abstract: A ferritic stainless steel sheet has a composition of C up to 0.02 mass %, Si up to 0.8 mass %, Mn up to 1.5 mass %, P up to 0.050 mass %, S up to 0.01 mass %, 8.0-35.0 mass % of Cr, N up to 0.05 mass %, 0.05-0.40 mass % of Ti and 0.10-0.50 mass % of Nb with a product of (% Ti % N) less than 0.005. Precipitates of 0.15 ?m or more in particle size except TiN are distributed in a steel matrix at a rate of 5000-50000/mm2. The steel sheet is manufactured by hot-rolling a slab at a finish-temperature of 800° C. or lower, annealing the hot-rolled steel sheet at 450-1080° C., cold-rolling the hot-rolled steel sheet in accompaniment with intermediate-annealing at a temperature within a range of from (a recrystallization-finishing temperature ?100° C.) to (a recrystallization-finishing temperature) and then finish-annealing the cold-rolled steel sheet at 1080° C. or lower.
    Type: Application
    Filed: March 3, 2009
    Publication date: July 2, 2009
    Applicant: Nisshin Steel Co., Ltd.
    Inventors: Yasutoshi Hideshima, Kouki Tomimura, Naoto Hiramatsu
  • Patent number: 7250071
    Abstract: A new austenitic stainless steel containing approximately 0.1-1.0 mass % of Si and not more than approximately 0.003 mass % of Al. Nonmetallic inclusions dispersed in a steel matrix are converted to MnO—SiO2—Al2O3 containing not less than approximately 15 mass % of SiO2 and not more than approximately 40 mass % of Al2O3. During steel making, molten steel is covered with basic slag and heavily deoxidized with a Si alloy whose Al content is controlled to not more than approximately 1.0 mass % in a vacuum or non-oxidizing atmosphere. The austenitic stainless steel sheet can be formed to an objective shape without the occurrence of cracking due to its decrease in susceptibility to cracking and its good formability.
    Type: Grant
    Filed: July 13, 2004
    Date of Patent: July 31, 2007
    Assignee: Nisshin Steel Co., Ltd.
    Inventors: Junichi Katsuki, Teruyoshi Iida, Takashi Yamauchi, Satoshi Suzuki, Naoto Hiramatsu
  • Patent number: 7070663
    Abstract: A ferritic or martensitic stainless steel has the structure that Cu-enriched particles with concentration of C not less than 0.1 mass % or concentration of Sn and/or In not less than 10 mass % were dispersed in a matrix. Precipitation and dispersion of Cu-enriched particles is realized by aging the stainless steel at 500–900° C. for 1 hour or longer on any stage after a hot-rolling step until a forming step to a final product. The ferritic stainless steel contains 0.01–1.0% C, Si up to 1.0%, Mn up to 1.0%, 15–30% Cr, Ni up to 6.0% and 0.5–6.0% Cu. The martensitic stainless steel contains 0.01–0.5% C, Si up to 1.0%, Mn up to 1.0%, 10–15% Cr, Ni up to 6.0% and 0.5–6.0% Cu. Since Cu-enriched particles are dispersed for improvement of machinability instead of addition of S, Pb, Bi or Se, the stainless steel is machined to an objective shape without any harmful influence on workability, corrosion-resistance and the environment.
    Type: Grant
    Filed: November 14, 2003
    Date of Patent: July 4, 2006
    Assignee: Nisshin Steel Co., Ltd.
    Inventors: Satoshi Suzuki, Hideki Tanaka, Naoto Hiramatsu
  • Patent number: 7014719
    Abstract: An austenitic stainless steel comprising (C+½N) up to 0.060 mass %, Si up to 1.0 mass %, Mn up to 5 mass %, S up to 0.003 mass %, S/Mn ratio up to 0.003, 15–20 mass % Cr, 5–12 mass % Ni, Cu up to 5 mass %, 0–3.0 mass % Mo and the balance being Fe except inevitable impurities under the condition that a value Md30 (representing a ratio of a strain-induced martensite) defined by the under-mentioned formula is controlled within a range of ?60 to ?10. Hardness increase of the steel sheet after being cold-rolled is preferably 20% or more as Vickers hardness. A metallurgical structure of the steel sheet is preferably adjusted to grain size number of #8 to #11 in a finish annealed state. The steel sheet is blanked with high dimensional accuracy, and a die life is also prolonged. Md30=551?462(C+N)?9.2Si?29(Ni+Cu)?8.1Mn?13.7Cr?18.5Mo.
    Type: Grant
    Filed: August 23, 2002
    Date of Patent: March 21, 2006
    Assignee: Nisshin Steel Co., Ltd.
    Inventors: Satoshi Suzuki, Takashi Igawa, Hiroshi Fujimoto, Naoto Hiramatsu
  • Patent number: 6935529
    Abstract: A fuel tank for a motor vehicle is fabricated from an austenitic stainless steel sheet having elongation of 50% or more after fracture by a uniaxial stretching test with a work-hardening coefficient of 4000 N/mm2 or a ferritic stainless steel sheet having elongation of 30% or more after fracture with Lankford value of 1.3 or more. The stainless steel sheets are reformed to a complicated shape of a fuel tank without work flaws such as cracks or break-down. Excellent corrosion-resistance of stainless steel itself is maintained in the fabricated fuel tank. Consequently, the proposed fuel tank is used without diffusion of gasoline to the open air over a long term.
    Type: Grant
    Filed: July 26, 2001
    Date of Patent: August 30, 2005
    Assignee: Nisshin Steel Co., Ltd.
    Inventors: Hanji Ishikawa, Shigeru Morikawa, Toshirou Nagoya, Toshiro Adachi, Naoto Hiramatsu, Satoshi Suzuki
  • Publication number: 20040261915
    Abstract: A new austenitic stainless steel containing approximately 0.1-1.0 mass % of Si and not more than approximately 0.003 mass % of Al. Nonmetallic inclusions dispersed in a steel matrix are converted to MnO—SiO2—Al2O3 containing not less than approximately 15 mass % of SiO2 and not more than approximately 40 mass % of Al2O3. During steel making, molten steel is covered with basic slag and heavily deoxidized with a Si alloy whose Al content is controlled to not more than approximately 1.0 mass % in a vacuum or non-oxidizing atmosphere. The austenitic stainless steel sheet can be formed to an objective shape without the occurrence of cracking due to its decrease in susceptibility to cracking and its good formability.
    Type: Application
    Filed: July 13, 2004
    Publication date: December 30, 2004
    Applicant: Nisshin Steel Co., Ltd.
    Inventors: Junichi Katsuki, Teruyoshi Iida, Takashi Yamauchi, Satoshi Suzuki, Naoto Hiramatsu
  • Publication number: 20040244884
    Abstract: A ferritic stainless steel sheet has a composition of C up to 0.02 mass %, Si up to 0.8 mass %, Mn up to 1.5 mass %, P up to 0.050 mass %, S up to 0.01 mass %, 8.0-35.0 mass % of Cr, N up to 0.05 mass %, 0.05-0.40 mass % of Ti and 0.10-0.50 mass % of Nb with a product of (% Ti×% N) less than 0.005. Precipitates of 0.15 &mgr;m or more in particle size except TiN are distributed in a steel matrix at a rate of 5000-50000/mm2. The steel sheet is manufactured by hot-rolling a slab at a finish-temperature of 800° C. or lower, annealing the hot-rolled steel sheet at 450-1080° C., cold-rolling the hot-rolled steel sheet in accompaniment with intermediate-annealing at a temperature within a range of from (a recrystallization-finishing temperature −100° C.) to (a recrystallization-finishing temperature) and then finish-annealing the cold-rolled steel sheet at 1080° C. or lower.
    Type: Application
    Filed: June 3, 2004
    Publication date: December 9, 2004
    Applicant: NISSHIN STEELCO., LTD
    Inventors: Yasutoshi Hideshima, Kouki Tomimura, Naoto Hiramatsu
  • Patent number: 6802430
    Abstract: A fuel tank and a fuel-filler tube, which maintain excellent corrosion-resistance over a long term even in a severely corrosive atmosphere, is made of a ferritic stainless steel sheet good of formability. The steel sheet, which has elongation of 30% or more after fracture by a uniaxial tensile test and minimum Lankford value (value-rmin) of 1.3 or more, is formed to a product shape, and paint is cathodically electrodeposited on a surface of the formed stainless steel sheet. The stainless steel sheet may be one coated with an Al or Zn plating layer. When the fuel tank or fuel-filler tube is fabricated by welding, Zn-rich paint is preferably applied to a welded part in prior to cathodic electrodeposition coating.
    Type: Grant
    Filed: March 26, 2003
    Date of Patent: October 12, 2004
    Assignee: Nisshin Steel Co., Ltd.
    Inventors: Kouki Tomimura, Yasutoshi Hideshima, Naoto Hiramatsu, Toshiro Adachi, Kazushi Shirayama
  • Publication number: 20040168750
    Abstract: A high-strength dual-phase stainless steel strip has a chemical composition consisting of 0.04-0.15 mass % C, 10.0-20.0 mass % Cr, 0.5-4.0 mass % Ni and the balance being Fe except inevitable impurities, and a metallurgical structure composed of 20-85 vol. % martensite grains and the balance ferrite grains with prior austenite grains controlled to 10 &mgr;m or less in size. The stainless steel strip is conditioned to hardness of HV 300 or more. Transformation strains are uniformly distributed in a steel matrix during martensitic transformation, so that the steel strip is formed and straightened to a belt shape without Lüders band. Consequently, steel belts with fine external appearance are manufactured from the stainless steel strip.
    Type: Application
    Filed: December 10, 2003
    Publication date: September 2, 2004
    Inventors: Kouki Tomimura, Hiroshi Fujimoto, Kenichi Morimoto, Naoto Hiramatsu
  • Patent number: 6780258
    Abstract: A new austenitic stainless steel containing approximately 0.1-1.0 mass % of Si and not more than approximately 0.003 mass % of Al. Nonmetallic inclusions dispersed in a steel matrix are converted to MnO—SiO2—Al2O3 containing not less than approximately 15 mass % of SiO2 and not more than approximately 40 mass % of Al2O3. During steel making, molten steel is covered with basic slag and heavily deoxidized with a Si alloy whose Al content is controlled to not more than approximately 1.0 mass % in a vacuum or non-oxidizing atmosphere. The austenitic stainless steel sheet can be formed to an objective shape without the occurrence of cracking due to its decrease in susceptibility to cracking and its good formability.
    Type: Grant
    Filed: January 8, 2002
    Date of Patent: August 24, 2004
    Assignee: Nisshin Steel Co., Ltd.
    Inventors: Junichi Katsuki, Teruyoshi Iida, Takashi Yamauchi, Satoshi Suzuki, Naoto Hiramatsu
  • Publication number: 20040140023
    Abstract: A ferritic stainless steel sheet, which is press-formed to a product shape without such dimensional defects as spring-back or torsion, has an alloying composition consisting of C up to 0.10%, Si up to 1.0%, Mn up to 1.0%, P up to 0.050%, S up to 0.020%, Ni up to 2.0%, 8.0-22.0% of Cr, N up to 0.05%, optionally one or more of Al up to 0.10%, Mo up to 1.0%, Cu up to 1.0%, 0.010-0.50% of Ti, 0.010-0.50% of Nb, 0.010-0.30% of V, 0.010-0.30% of Zr and 0.0010-0.0100% of B, and the balance being essentially Fe with the provision that a value-FM defined by the formula (1) is adjusted to 0 or less. Its mechanical properties are controlled to a plane anisotropic degree (rmax−rmin) of Lankford value (r) ≦0.80 and an anisotropic degree (&sgr;max−&sgr;min) of 0.2%-yield strength ≦20 N/mm2. The stainless steel sheet is manufactured by hot-rolling a stainless steel having the specified composition and then batch-annealing the hot-rolled steel sheet 1-24 hours at 700-800° C.
    Type: Application
    Filed: November 6, 2003
    Publication date: July 22, 2004
    Inventors: Kouki Tomimura, Hiroshi Fujimoto, Kenichi Morimoto, Yasutoshi Kunitake, Naoto Hiramatsu
  • Patent number: 6764555
    Abstract: A high-strength austenitic stainless steel strip exhibiting excellent flatness with Vickers hardness of 400 or more has the composition comprising: C up to 0.20 mass %, Si up to 4.0 mass %, Mn up to 5.0 mass %, 4.0-12.0 mass % Ni, 12.0-20.0 mass % Cr, Mo up to 5.0 mass %, N up to 0.15 mass % and the balance being Fe except inevitable impurities having a value Md(N) in a range of 0-125 defined by the formula Md(N)=580-520C-2Si-16Mn-16Cr-23Ni-26Cu-300N-10Mo. The material has a dual-phase structure of austenite and martensite involving a reverse-transformed austenite at a ratio of 3 vol. % or more. The material is manufactured by solution-heating a steel strip having the above composition, cold-rolling the steel strip to generate a deformation-induced martensite, and then re-heating at 500-700° C. to induce a phase reversion from martensite to at least 3 vol. % austenite. The reversion effectively flattens the steel strip.
    Type: Grant
    Filed: December 3, 2001
    Date of Patent: July 20, 2004
    Assignee: Nisshin Steel Co., Ltd.
    Inventors: Naoto Hiramatsu, Kouki Tomimura, Hiroshi Fujimoto, Kenichi Morimoto
  • Patent number: 6749701
    Abstract: A high-strength, high-toughness martensitic stainless steel sheet has a chemical composition comprising, in mass percent, more than 0.03 to 0.15% of C, 0.2-2.0% of Si, not more than 1.0% of Mn, not more than 0.06% of P, not more than 0.006% of S, 2.0-5.0% of Ni, 14.0-17.0% of Cr, more than 0.03 to 0.10% of N, 0.0010-0.0070% of B, and the balance of Fe and unavoidable impurities and has an A value of not less than −1.8, where A value=30(C+N)−1.5Si+0.5Mn+Ni−1.3Cr+11.8. The suitability of the steel sheet as a gasket material is enhanced by producing it to include not less than 85 vol % of martensite phase and to have a spring bending elastic limit Kb0.1 after application of tensile strain of 0.1% of not less than 700 N/mm2. Edge cracking during cold rolling is inhibited by conducting cold rolling after subjecting the hot-rolled sheet to 600-800° C.×10 hr or less intermediate annealing to impart a steel hardness of not greater than Hv 380.
    Type: Grant
    Filed: November 5, 2002
    Date of Patent: June 15, 2004
    Assignee: Nisshin Steel Co., Ltd.
    Inventors: Naoto Hiramatsu, Kouki Tomimura, Seiichi Isozaki
  • Publication number: 20040096351
    Abstract: A ferritic or martensitic stainless steel has the structure that Cu-enriched particles with concentration of C not less than 0.1 mass % or concentration of Sn and/or In not less than 10 mass % were dispersed in a matrix. Precipitation and dispersion of Cu-enriched particles is realized by aging the stainless steel at 500-900° C. for 1 hour or longer on any stage after a hot-rolling step until a forming step to a final product. The ferritic stainless steel contains 0.01-1.0% C, Si up to 1.0%, Mn up to 1.0%, 15-30% Cr, Ni up to 6.0% and 0.5-6.0% Cu. The martensitic stainless steel contains 0.01-0.5% C, Si up to 1.0%, Mn up to 1.0%, 10-15% Cr, Ni up to 6.0% and 0.5-6.0% Cu. Since Cu-enriched particles are dispersed for improvement of machinability instead of addition of S, Pb, Bi or Se, the stainless steel is machined to an objective shape without any harmful influence on workability, corrosion-resistance and the environment.
    Type: Application
    Filed: November 14, 2003
    Publication date: May 20, 2004
    Applicant: Nisshin Steel Co., Ltd.
    Inventors: Satoshi Suzuki, Hideki Tanaka, Naoto Hiramatsu
  • Publication number: 20040076776
    Abstract: A fuel tank for a motor vehicle is fabricated from an austenitic stainless steel sheet having elongation of 50% or more after fracture by a uniaxial stretching test with a work-hardening coefficient of 4000N/mm2 or a ferritic stainless steel sheet having elongation of 30% or more after fracture with Lankford value of 1.3 or more. The stainless steel sheets are reformed to a complicated shape of a fuel tank without work flaws such as cracks or break-down. Excellent corrosion-resistance of stainless steel itself is maintained in the fabricated fuel tank. Consequently, the proposed fuel tank is used without diffusion of gasoline to the open air over a long term.
    Type: Application
    Filed: September 26, 2003
    Publication date: April 22, 2004
    Inventors: Hanji Ishikawa, Shigeru Morikawa, Toshiro Adachi, Naoto Hiramatsu, Satoshi Suzuki
  • Patent number: 6723181
    Abstract: A new soft stainless steel sheet has an austenite-stability index Md30 controlled in a range of −120 to −10 and a stacking fault formability index SFI controlled not less than 30, and involves precipitates whose Cu concentration is controlled not more than 1.0%, so as to maintain concentration of dissolved Cu at 1-5%. The stainless steel sheet preferably contains up to 0.06%(C+N), up to 2.0% Si, up to 5% Mn, 15-20% Cr, 5-9% Ni, 1.0-4.0% Cu, up to 0.003% Al, up to 0.005% S, and optionally one or more of up to 0.5% Ti, up to 0.5% Nb, up to 0.5% Zr, up to 0.5% V, up to 3.0% Mo, up to 0.03% B, up to 0.02% REM (rare earth metals) and up to 0.03% Ca. The stainless steel sheet can be plastically deformed to an objective shape without any cracks even at a part heavily-worked part by multi-stage deep drawing or compression deforming. Md30(° C.)=551−462(C+N)−9.2Si−8.1Mn−29(Ni+Cu)−13.7Cr−18.5Mo SFI(mJ/m2)=2.2Ni+6Cu−1.
    Type: Grant
    Filed: April 11, 2002
    Date of Patent: April 20, 2004
    Assignee: Nisshin Steel Co., Ltd.
    Inventors: Hanji Ishikawa, Masato Otsuka, Satoshi Suzuki, Hideki Tanaka, Junichi Katsuki, Takashi Yamauchi, Naoto Hiramatsu
  • Publication number: 20030183626
    Abstract: A fuel tank and a fuel-filler tube, which maintain excellent corrosion-resistance over a long term even in a severely corrosive atmosphere, is made of a ferritic stainless steel sheet good of formability. The steel sheet, which has elongation of 30% or more after fracture by a uniaxial tensile test and minimum Lankford value (value-rmin) of 1.3 or more, is formed to a product shape, and paint is cathodically electrodeposited on a surface of the formed stainless steel sheet. The stainless steel sheet may be one coated with an Al or Zn plating layer. When the fuel tank or fuel-filler tube is fabricated by welding, Zn-rich paint is preferably applied to a welded part in prior to cathodic electrodeposition coating.
    Type: Application
    Filed: March 26, 2003
    Publication date: October 2, 2003
    Applicant: Nisshin Steel Co., Ltd.
    Inventors: Kouki Tomimura, Yasutoshi Hideshima, Naoto Hiramatsu, Toshiro Adachi, Kazushi Shirayama
  • Publication number: 20030177617
    Abstract: A stainless steel suitable for use with a needle detector, that has a magnetic permeability of 1.005 or less in a magnetic field of 1 kOe, and a magnetization of 550 memu/g or less in a magnetic field of 18 kOe. The steel comprises, in mass %, 0.01 to 0.15% of C, 0.1 to 5% of Si, 1 to 10% of Mn, 8 to 25% of Ni, 14 to 30% of Cr, 0.01 to 0.25% of N, and the remainder Fe and impurities, wherein an Ni equivalent, which is defined as Ni equivalent=Ni+0.6Mn+9.69(C+N)+0.18Cr−0.11Si2, has a value of 19 or more, and may further contain at least one selected from among a) 0.5 to 3% of Cu, b) 0.05 to 0.5% of at least one element selected from Nb, W and V, and c) 0.1 to 2% of Mo.
    Type: Application
    Filed: March 21, 2003
    Publication date: September 25, 2003
    Inventors: Kazuhiko Kita, Sakae Awata, Kouki Sugihara, Satoshi Suzuki, Katsumi Ishii, Naoto Hiramatsu