Patents by Inventor Akihiko Takahashi

Akihiko Takahashi 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: 8226780
    Abstract: This ferrite-austenite stainless steel sheet includes: in terms of mass %, C: 0.1% or less; Cr: 17 to 25%; Si: 1% or less; Mn: 3.7% or less; Ni: 0.6 to 3%; Cu: 0.1 to 3%; and N: 0.06% or more and less than 0.15%, with the remainder being Fe and inevitable impurities, wherein the steel sheet has a two-phase structure consisting of a ferrite phase and an austenite phase, a volume fraction of the austenite phase is in a range of 15 to 70%, and in a sheet plane (ND) of a center of a sheet thickness, grains of the ferrite phase having a crystal orientation satisfying ND//{111}±10° and grains of the ferrite phase having a crystal orientation satisfying ND//{101}±10° are present in a total content of 10% by area or more.
    Type: Grant
    Filed: January 30, 2009
    Date of Patent: July 24, 2012
    Assignees: Nippon Steel, Sumikin Stainless Steel Corporation
    Inventors: Masaharu Hatano, Akihiko Takahashi, Eiichiro Ishimaru, Ken Kimura
  • Publication number: 20120068653
    Abstract: A method and a system for determining deterioration of permanent magnets of an electric apparatus to be inspected that facilitate determination without the need to remove the electric apparatus from a facility where it is installed. If the electric apparatus to be inspected is a three-phase linear motor, a current detector is used to acquire currents. A three-phase/two-phase conversion section converts the acquired currents into an ?-axis current command and a ?-axis current command. A locus of a current vector is computed based on the ?-axis current command and the ?-axis current command. A comparing and determining section compares the computed locus with a standard upper limit value stored in a storage means. If the number of times that the locus of the current vector exceeds the standard upper limit value exceeds a predetermined value, it is determined that the permanent magnets have been deteriorated.
    Type: Application
    Filed: September 22, 2011
    Publication date: March 22, 2012
    Applicant: SANYO DENKI CO., LTD.
    Inventors: Akihiko Takahashi, Yasushi Misawa, Manabu Horiuchi
  • Publication number: 20120014830
    Abstract: Ferritic stainless steel excellent in heat resistance and workability which contains, by mass %, C: 0.02% or less, N: 0.02% or less, Si: 2% or less, Mn: 2% or less, Cr: 10 to 20%, Cu: 0.4 to 3%, Ti: 0.01 to 0.5%, and B: 0.0002 to 0.0030% and has a balance of Fe and unavoidable impurities.
    Type: Application
    Filed: March 23, 2010
    Publication date: January 19, 2012
    Inventors: Junichi Hamada, Norihiro Kanno, Akihiko Takahashi, Yoshiharu Inoue, Shinichi Teraoka
  • Publication number: 20120009433
    Abstract: The present invention provides a duplex stainless steel sheet with excellent press-formability which defines the ingredients of the steel, Ni balance, and austenite phase rate to obtain a 0.2% proof stress and Erichsen value equal to that of SUS304 or another austenitic stainless steel, that is, a duplex stainless steel sheet which contains, by mass %, C: 0.05% or less, Si: 0.5 to 3%, Mn: 1 to 5%, Cr: 16 to 21%, Ni: 1 to 6%, Cu: 0.5 to 3%, and N: 0.07% or less, has an Ni-bal. value given by the following formula <1> of ?7.5 to ?3.5, has a balance of Fe and unavoidable impurities, has an austenite phase rate of 50% to 95%, and has a balance of ferrite phases: Ni-bal.=30(C+N)+Ni+0.5Mn+0.3Cu?1.1(Cr+1.5Si)+8.
    Type: Application
    Filed: March 17, 2010
    Publication date: January 12, 2012
    Inventors: Masaharu Hatano, Akihiko Takahashi, Eiichiro Ishimaru, Ken Kimura
  • Publication number: 20120002076
    Abstract: A camera includes: a photographing unit that generates image files by consecutively capturing subject images at an electronic shutter speed high enough to ensure that no image blur occurs in the subject images; an image file recording unit that records image files into a storage medium; a setting unit that sets a movie image frame rate; a synthetic image generation unit that generates a plurality of synthetic images each by combining sets of image data in image files among a plurality of image files generated by the photographing unit, a quantity of the sets of image data being set by taking into consideration the frame rate set by the setting unit; and a movie image file generation unit that generates a movie image file containing a movie image, each frame of the movie image being constituted with one of the synthetic images.
    Type: Application
    Filed: June 29, 2011
    Publication date: January 5, 2012
    Applicant: NIKON CORPORATION
    Inventors: Akihiko TAKAHASHI, Shigemasa SATO
  • Publication number: 20110265920
    Abstract: The present invention provides an alloy-saving type of high purity ferritic stainless steel excellent in corrosion resistance and a method of production of the same. A high purity ferritic stainless steel excellent in corrosion resistance comprised of, by mass %, C: 0.001 to 0.02%, Si: 0.01 to 0.6%, Mn: 0.01 to 0.6%, P: 0.005 to 0.04%, S: 0.0001 to 0.01%, Cr: 13 to 22%, N: 0.001 to 0.02%, Al: 0.005 to 0.05%, Sn: 0.001 to 1%, and a balance of Fe and unavoidable impurities, said steel characterized by satisfying the two relations of the following formula (1) and formula (2) where I(Fe), I(Cr), I(Sn), and I(O) are the X-ray intensities of the Fe oxides, Cr oxides, Sn oxides, and other detected oxides at the steel surface measured by an X-ray photoelectron spectrometer: 0<I(Fe)/I(Cr)<5??formula (1) and 0<I(O)/I(Sn)<3??formula (2) To improve the effect of modification of the coating by addition of Sn, the method comprises annealing at a temperature higher than 800° C.
    Type: Application
    Filed: December 7, 2009
    Publication date: November 3, 2011
    Inventors: Masaharu Hatano, Akihiko Takahashi, Eiichiro Ishimaru, Shigenori Takahata
  • Publication number: 20110236248
    Abstract: The present invention provides high purity ferrite stainless steel able to reduce deterioration in surface conditions due to pitting corrosion or rusting or other corrosion to an extent no different from SUS304 or better without inviting a drop in manufacturability or workability and without relying on the addition of rare elements, and a method of production of the same, that is, ferritic stainless steel containing, by mass %, C: 0.01% or less, Si: 0.01 to 0.20%, Mn: 0.01 to 0.30%, P: 0.04% or less, S: 0.01% or less, Cr: 13 to 22%, N: 0.001 to 0.020%, Ti: 0.05 to 0.35%, Al: 0.005 to 0.050%, Sn: 0.001 to 1%, and a balance of Fe and unavoidable impurities to which Sn is added to modify the passive film and improve the corrosion resistance. To improve the effect of modification of the passive film by the addition of Sn, after the final annealing, the steel is held in the 200 to 700° C. temperature range for 1 minute or more.
    Type: Application
    Filed: January 13, 2009
    Publication date: September 29, 2011
    Inventors: Masaharu Hatano, Akihiko Takahashi
  • Publication number: 20110186184
    Abstract: The present invention provides a ferritic stainless steel casting and a sheet thereof excellent in deep drawability, punch stretchability and ridging resistance and a method for producing the casting and the sheet. In the present invention, a chemical composition is controlled so that the amounts of C, N, Si, Mn, P and Ti may be reduced to the utmost for securing high workability and, on the basis of the chemical composition, the roping and ridging of a steel sheet product is reduced by adding Mg, thus dispersing Mg containing oxides that accelerate the formation of nuclei for solidification and, resultantly, suppressing the development of coarse columnar crystals in a casting. The present invention is characterized in that the average composition of the Mg containing oxides dispersing in a casting satisfies the following expressions <2> and <3>, 17.4(Al2O3)+3.9(MgO)+0.3(MgAl2O4)+18.7(CaO)?500??<2>, (Al2O3)+(MgO)+(MgAl2O4)+(CaO)?95??<3>.
    Type: Application
    Filed: April 5, 2011
    Publication date: August 4, 2011
    Applicant: NIPPON STEEL & SUMIKIN STAINLESS STEEL CORPORATION
    Inventors: Akihiko Takahashi, Junichi Hamada, Ken Kimura, Takashi Morchoshi, Yoshihito Yamada, Toyohiko Kakihara, Satoshi Hashimoto
  • Publication number: 20110176953
    Abstract: A ferritic stainless steel sheet for EGR coolers includes at least, by mass % C: 0.03% or less, N: 0.05% or less, Si: 0.1% to 1%, Mn: 0.02% to 2%, Cu: 0.2% to 1.5%, Cr: 15% to 25%, Nb: 8 (C+N) % to 1%, Al: 0.5% or less, and Fe and inevitable impurities as the balance, wherein the steel sheet further includes, by mass %, Ti at an amount fulfilling the following formulae (1) and (2), and Cr and Cu are included at amounts fulfilling the following formula (3), Ti-3N?0.03??(1), 10(Ti-3N)+Al?0.5??(2), and Cr+2.3Cu?18??(3).
    Type: Application
    Filed: October 23, 2009
    Publication date: July 21, 2011
    Inventors: Nobuhiko Hiraide, Akihiko Takahashi, Shigeru Maeda
  • Publication number: 20110164147
    Abstract: An imaging apparatus includes: an instruction unit that issues a photographing instruction signal; an image sensor that obtains frame images over predetermined time intervals; a storage unit in which a plurality of the frame images obtained via the image sensor are sequentially stored; a save candidate determining unit that designates, among the plurality of the frame images stored in the storage unit, a plurality of the frame images obtained before and after an issue of the photographing instruction signal as candidates of images to be saved into a recording medium; and a candidate number determining unit that automatically determines, based upon specific information, a candidate number of the frame images that are to be designated as candidates by the save candidate determining unit.
    Type: Application
    Filed: September 23, 2010
    Publication date: July 7, 2011
    Applicant: NIKON CORPORATION
    Inventors: Akihiko TAKAHASHI, Shigemasa SATO
  • Publication number: 20110110812
    Abstract: This ferrite stainless steel for use in producing a urea water tank includes: in terms of mass %, C: 0.05% or less; N: 0.05% or less; Si: 0.02 to 1.5%; Mn: 0.02 to 2%; Cr: 15 to 23%; and either one or both of Nb and Ti at a content within a range of 8(C+N) to 1% (herein, C and N represent the contents of C and N (expressed by mass %), respectively, and the numerical values shown in front of the atomic symbols represent constant numbers), with the remainder being iron and unavoidable impurities, wherein an effective amount of Cr expressed by any one of the following Equations (I), (II), and (III) is 15% or more (herein, the atomic symbols in Equations (I) to (III) represent the contents of the elements (expressed by mass %), and the numerical values shown in front of the atomic symbols represent constant numbers).
    Type: Application
    Filed: July 23, 2009
    Publication date: May 12, 2011
    Inventors: Nobulhiko Hiraide, Haruhiko Kajimura, Akihiko Takahashi, Shigeru Maeda
  • Patent number: 7883663
    Abstract: The present invention provides optimal low chromium stainless steel preventing the deterioration in corrosion resistance at the weld zone in the case of multipass welding, superior in grain boundary corrosion resistance of the weld zone even in a harsh corrosive environment, simultaneously free from preferential corrosion at the heat affected zones near weld fusion lines, and further superior in manufacturability, that is, low chromium stainless steel containing, by mass %, C: 0.03% or less, N: 0.004 to 0.02%, Si: 0.2 to 1%, Mn: over 1.5 to 2.5%, P: 0.04% or less, S: 0.03% or less, Cr: 10 to 15%, Ni: 0.2 to 3.0%, and Al: 0.005 to 0.1%, further containing Ti: 4×(C %+N %) to 0.35%, and having a balance of Fe and unavoidable impurities, having a ?p(%) expressed by a predetermined formula satisfying 80 or more, and satisfying Ti %×N %<0.004 as well.
    Type: Grant
    Filed: July 3, 2007
    Date of Patent: February 8, 2011
    Assignee: Nippon Steel & Sumikin Stainless Steel Corporation
    Inventors: Masuhiro Fukaya, Akihiko Takahashi, Shinichi Teraoka, Shunji Sakamoto
  • Publication number: 20110029271
    Abstract: A method of inspecting motor condition, which allows inspection of a condition of a motor installed in an apparatus without removing the motor from the apparatus, is provided. A device for inspecting motor characteristics includes: a measuring section for measuring a frequency value and an amplitude value of a waveform of a counter electromotive force generated when a mover of the motor is moved by an external force; and a computing section for computing a counter electromotive force constant on the basis of the frequency value and the amplitude value. An armature winding of the motor and the inspecting device are electrically connected with a power supply line disconnected from the motor. An external force is applied to the mover of the motor. A condition of the motor is determined on the basis of the computed result.
    Type: Application
    Filed: July 28, 2010
    Publication date: February 3, 2011
    Applicant: SANYO DENKI CO., LTD.
    Inventor: Akihiko Takahashi
  • Publication number: 20110000589
    Abstract: This ferrite-austenite stainless steel sheet includes: in terms of mass %, C: 0.1% or less; Cr: 17 to 25%; Si: 1% or less; Mn: 3.7% or less; Ni: 0.6 to 3%; Cu: 0.1 to 3%; and N: 0.06% or more and less than 0.15%, with the remainder being Fe and inevitable impurities, wherein the steel sheet has a two-phase structure consisting of a ferrite phase and an austenite phase, a volume fraction of the austenite phase is in a range of 15 to 70%, and in a sheet plane (ND) of a center of a sheet thickness, grains of the ferrite phase having a crystal orientation satisfying ND//{111}±10° and grains of the ferrite phase having a crystal orientation satisfying ND//{101}±10° are present in a total content of 10% by area or more.
    Type: Application
    Filed: January 30, 2009
    Publication date: January 6, 2011
    Applicant: Nippon Steel & Sumikin Stainless Steel Corporation
    Inventors: Masaharu Hatano, Akihiko Takahashi, Eiichiro Ishimaru, Ken Kimura
  • Publication number: 20100225784
    Abstract: An image-capturing device includes: an instruction unit that issues a photographing instruction signal; an image sensor that obtains frame images over predetermined time intervals; a storage unit into which a plurality of frame images obtained via the image sensor are sequentially stored; a save candidate designation unit that designates a plurality of frame images obtained before and after an output of the photographing instruction signal among a plurality of frame images stored in the storage unit as save candidate images that may be saved into a recording medium; and a control unit that controls the save candidate designation unit so as to designate as the save candidates a plurality of frame images obtained before and after a second photographing instruction signal issued within a predetermined length of time following the output of the photographing instruction signal.
    Type: Application
    Filed: February 18, 2010
    Publication date: September 9, 2010
    Applicant: NIKON CORPORATION
    Inventors: Shigemasa SATO, Akihiko TAKAHASHI, Setsu MITSUHASHI, Tetsuo IN
  • Publication number: 20100126644
    Abstract: The present invention relates to ferritic-austenitic stainless steel oriented to have low Ni which is excellent in corrosion resistance, particularly in corrosion resistance in a neutral chloride environment, and has high “uniform elongation”—a factor governing workability—and a method of production for the same. There are independently provided ferritic-austenitic stainless steels and methods of production for the same particularly having a corrosion resistance in a neutral chloride environment satisfying PI value(=Cr+3Mo+10N—Mn)?18% and having a uniform elongation satisfying ?10?Md?110 (where Md=551?462({C}+[N])?9.2[Si]?8.1[Mn]?13.7[Cr]?29[Ni]?29[Cu]?18.
    Type: Application
    Filed: August 1, 2008
    Publication date: May 27, 2010
    Inventors: Masaharu Hatano, Akihiko Takahashi, Eiichiro Ishimaru, Ken Kimura
  • Patent number: 7682559
    Abstract: A Cr-bearing heat-resistant steel sheet with excellent workability comprising, in mass %, C of 0.001% to 0.010%, Si of 0.01% to 0.60%, Mn of 0.05% to 0.60%, P of 0.01% to 0.04%, S of 0.0005% to 0.0100%, Cr of 14% to 19%, N of 0.001% to 0.020%, Nb of 0.3% to 1.0%, Mo of 0.5% to 2.0% and, as required, one or more of Cu of 0.5% to 3.0%, W of 0.01% to 1.0% and Sn of 0.01% to 1.00%, and/or one or more of Ti of 0.01% to 0.20%, Al of 0.005% to 0.100%, Mg of 0.0002% to 0.0100%, and B of 0.0003% to 0.001%, with the remainder comprising iron and unavoidable impurities, and having an x-ray intensity ratio {111}/({100}+{211}) of 2 or greater in the central region of thickness.
    Type: Grant
    Filed: December 12, 2003
    Date of Patent: March 23, 2010
    Assignee: Nippon Steel Corporation
    Inventors: Junichi Hamada, Naoto Ono, Akihiko Takahashi, Tadashi Komori
  • Publication number: 20090159602
    Abstract: The present invention proposes an austenitic high Mn stainless steel maintaining a hydrogen embrittlement resistance above that of SUS316L and adapted to a low temperature hydrogen environment by being designed in compositions to comprise, by mass %, C: 0.01 to 0.10%, N: 0.01 to 0.40%, Si: 0.1 to 1%, Cr: 10 to 20%, Mn: 6 to 20%, Cu: 2 to 5%, Ni: 1 to 6%, and a balance of Fe and unavoidable impurities and have an Md30 value of an indicator of an austenite stabilization degree satisfying ?120<Md30<20, where Md30=497-462(C+N)-9.2Si-8.1Mn-13.7Cr-20(Ni+Cu)-18.
    Type: Application
    Filed: October 27, 2006
    Publication date: June 25, 2009
    Inventors: Masaharu Hatano, Akihiko Takahashi
  • Publication number: 20090098009
    Abstract: The present invention provides optimal low chromium stainless steel preventing the deterioration in corrosion resistance at the weld zone in the case of multipass welding, superior in grain boundary corrosion resistance of the weld zone even in a harsh corrosive environment, simultaneously free from preferential corrosion at the heat affected zones near weld fusion lines, and further superior in manufacturability, that is, low chromium stainless steel containing, by mass %, C: 0.03% or less, N: 0.004 to 0.02%, Si: 0.2 to 1%, Mn: over 1.5 to 2.5%, P: 0.04% or less, S: 0.03% or less, Cr: 10 to 15%, Ni: 0.2 to 3.0%, and Al: 0.005 to 0.1%, further containing Ti: 4×(C %+N %) to 0.35%, and having a balance of Fe and unavoidable impurities, having a ?p(%) expressed by a predetermined formula satisfying 80 or more, and satisfying Ti %×N %<0.004 as well.
    Type: Application
    Filed: July 3, 2007
    Publication date: April 16, 2009
    Inventors: Masuhiro Fukaya, Akihiko Takahashi, Shinichi Teraoka, Shunji Sakamoto
  • Publication number: 20080202596
    Abstract: An air bleeding pipe joint has a pair of connection pipe portions, a branch pipe portion having an air bleeding hole in an inside thereof, a plug body, and an elastic annular sealing member providing an air-tight seal between a female fitting surface of the branch pipe portion and a male fitting surface of the plug body. The plug body is removably mounted to the branch pipe portion in threaded engagement therewith such that a seating surface of the plug body seats on a seated surface of the branch pipe portion. An air discharge path is provided on an upper end of the branch pipe portion and/or the plug body with respect to a sealing position at which the sealing member is disposed for discharging outwardly an air that leaks upwardly through the sealing position.
    Type: Application
    Filed: February 18, 2008
    Publication date: August 28, 2008
    Inventors: Kazuhiro Kato, Akihiko Takahashi, Masahisa Isaji