Patents by Inventor Keiichi Nakamura

Keiichi Nakamura 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: 20240241346
    Abstract: A zoom lens comprises, in order from an object: a first lens group (G1) having positive refractive power; a second lens group (G2) having negative refractive power; a third lens group (G3) having positive refractive power; a fourth lens group (G4) having negative refractive power; and a fifth lens group (G5) having positive refractive power, in which the first to the fifth lens groups (G1 to G5) each move in an optical axis direction upon zooming from a wide angle end state to a telephoto end state, at least a part of the fourth lens group (G4) is configured to serve as a focusing lens group to move in the optical axis direction upon focusing, the first lens group (G1) consists of two lenses, and the following conditional expression is satisfied. 0.3 < GD ? 3 / ft < 0.8 where, GD3 denotes a thickness of the third lens group (G3) on the optical axis, and ft denotes a focal length of the zoom lens in the telephoto end state.
    Type: Application
    Filed: March 25, 2024
    Publication date: July 18, 2024
    Inventor: Keiichi NAKAMURA
  • Publication number: 20240234218
    Abstract: A method for manufacturing a substrate according to the first disclosure includes immersing a substrate on which a plurality of circuit patterns are formed in pure water or a corrosive solution, applying voltage between the plurality of circuit patterns in a state in which the substrate is immersed in the pure water or the corrosive solution and determining the substrate to be a defective product when a tree is generated in the plurality of circuit patterns due to the voltage application and determining the substrate to be a non-defective product when the tree is not generated.
    Type: Application
    Filed: October 5, 2021
    Publication date: July 11, 2024
    Applicant: Mitsubishi Electric Corporation
    Inventors: Mamoru MATSUO, Kenta NAKAHARA, Keiichi NAKAMURA
  • Publication number: 20240200410
    Abstract: This invention provides an oil well steel pipe with a threaded connection with which excellent galling resistance is obtained without using a compound grease, and which can suppress the occurrence of rust on a pin contact surface and can also keep shouldering torque at a low level. An oil well steel pipe with a threaded connection of the present disclosure includes a pipe main body including a first end portion and a second end portion. The pipe main body includes a pin formed at the first end portion, and a box formed at the second end portion. A light oil is applied to a pin contact surface of the pin. A solid lubricant coating is formed on a box contact surface of the box.
    Type: Application
    Filed: April 28, 2022
    Publication date: June 20, 2024
    Inventors: Yuya NAKAI, Takao KURANISHI, Keiichi NAKAMURA, Yuki BENIYA, Hideki MITSUNARI
  • Patent number: 11994746
    Abstract: A zoom lens comprises, in order from an object: a first lens group (G1) having positive refractive power; a second lens group (G2) having negative refractive power; a third lens group (G3) having positive refractive power; a fourth lens group (G4) having negative refractive power; and a fifth lens group (G5) having positive refractive power, in which the first to the fifth lens groups (G1 to G5) each move in an optical axis direction upon zooming from a wide angle end state to a telephoto end state, at least a part of the fourth lens group (G4) is configured to serve as a focusing lens group to move in the optical axis direction upon focusing, the first lens group (G1) consists of two lenses, and the following conditional expression is satisfied. 0.30<GD3/ft<0.8 where, GD3 denotes a thickness of the third lens group (G3) on the optical axis, and ft denotes a focal length of the zoom lens in the telephoto end state.
    Type: Grant
    Filed: November 15, 2021
    Date of Patent: May 28, 2024
    Assignee: Nikon Corporation
    Inventor: Keiichi Nakamura
  • Publication number: 20240136235
    Abstract: A method for manufacturing a substrate according to the first disclosure includes immersing a substrate on which a plurality of circuit patterns are formed in pure water or a corrosive solution, applying voltage between the plurality of circuit patterns in a state in which the substrate is immersed in the pure water or the corrosive solution and determining the substrate to be a defective product when a tree is generated in the plurality of circuit patterns due to the voltage application and determining the substrate to be a non-defective product when the tree is not generated.
    Type: Application
    Filed: October 4, 2021
    Publication date: April 25, 2024
    Applicant: Mitsubishi Electric Corporation
    Inventors: Mamoru MATSUO, Kenta NAKAHARA, Keiichi NAKAMURA
  • Patent number: 11891470
    Abstract: A method for producing a chloroprene-based polymer latex which can efficiently remove a residual volatile organic substance from the chloroprene-based polymer latex while suppressing the deposition of agglomerates is provided. In the method for producing a chloroprene-based polymer latex of the present invention, when the residual volatile organic substance comprised in the latex is volatilized and removed, a mixed fluid of one or more gases selected from the group consisting of inert gases and air, and water is contacted with the latex at a gas pressure higher than the saturated water vapor pressure, and a temperature of the mixed fluid is a temperature lower than a boiling point of water at the gas pressure.
    Type: Grant
    Filed: May 13, 2020
    Date of Patent: February 6, 2024
    Assignee: Resonac Corporation
    Inventors: Yuki Miura, Yuji Hashimoto, Keiichi Nakamura
  • Publication number: 20230349503
    Abstract: This invention provides an oil-well metal pipe which is capable of achieving both high yield torque and excellent galling resistance in a compatible manner. An oil-well metal pipe of the present disclosure includes a pipe main body. The pipe main body includes a pin that is formed at the first end portion, and a box that is formed at the second end portion. A plating layer is formed on a first contact surface, which is one of a pin contact surface of the pin and a box contact surface of the box, and a solid lubricant layer is formed on the plating layer. An arithmetic average roughness Ra of a second contact surface, which is the other of the pin contact surface and the box contact surface, is 0.5 to 10.0 ?m, and a semi-solid or liquid anti-rust coating is formed on the second contact surface.
    Type: Application
    Filed: August 25, 2021
    Publication date: November 2, 2023
    Inventors: Yuki BENIYA, Keiichi NAKAMURA, Takao KURANISHI
  • Publication number: 20230203631
    Abstract: The steel material according to the present disclosure consists of, in mass%, C: 0.15 to 0.45%, Si: 0.05 to 1.00%, Mn: 0.05 to less than 0.80%, P: 0.030% or less, S: 0.0100% or less, Al: 0.100% or less, Cr: 0.30 to 1.50%, Mo: 0.25 to 2.00%, Ti: 0.001 to 0.015%, N: 0.0100% or less, O: 0.0050% or less, V: 0 to 0.05%, Nb: 0 to 0.010%, B: 0 to less than 0.0005%, Ca: 0 to 0.0100%, Mg: 0 to 0.0100%, and rare earth metal: 0 to 0.0100%, with the balance being Fe and impurities. In the steel material, the grain size number of prior-austenite grains is less than 7.0, Formula (1) to Formula (4) described in the specification are satisfied, the yield strength is 896 MPa or more, and the absorbed energy at -10° C. is 95 J or more.
    Type: Application
    Filed: April 15, 2021
    Publication date: June 29, 2023
    Inventors: Keiichi KONDO, Yuji ARAI, Keiichi NAKAMURA, Taro OE, Takenori KURAMOTO, Yosuke TAKEDA, Hiroki KAMITANI
  • Patent number: 11614129
    Abstract: The automatic transmission has, on an axis of a power transmission shaft: a one-side clutch including a plurality of friction plates; and an other-side clutch including a plurality of friction plate. A pressing section of a piston of the one-side clutch and a pressing section of a piston of the other-side clutch are arranged to overlap each other in an axial direction. On one side in the axial direction of the plurality of friction plates of the one-side clutch, a radial section of the piston of the one-side clutch and a radial section of the piston of the other-side clutch are arranged in parallel in the axial direction. Pressure-receiving sections of the pistons of the one-side clutch and the other-side clutch and bearing sections of the pistons of the one-side clutch and the other-side clutch are aggregated and arranged on a radially inner side.
    Type: Grant
    Filed: October 29, 2021
    Date of Patent: March 28, 2023
    Assignee: Mazda Motor Corporation
    Inventors: Tatsuhiko Iwasaki, Tatsutoshi Mizobe, Yoshihiko Fujita, Keiichi Nakamura
  • Patent number: 11536322
    Abstract: An automatic transmission has a one-side clutch and an other-side clutch in an axial direction, the one-side clutch and the other-side clutch being aligned in the axial direction on an axis of a power transmission shaft. These clutches respectively include: drum sections; hub sections; friction plates that are engaged in an axially slidable manner between the drum sections and the hub sections; and pistons that press the friction plates. The friction plates in the one-side and other-side clutches are arranged in parallel in the axial direction. The pistons in the one-side clutch and the other-side clutch are arranged on one sides in the axial direction of the friction plates and are arranged such that axial positions thereof overlap. The piston in the other-side clutch penetrates the friction plate in the one-side clutch in the axial direction.
    Type: Grant
    Filed: October 27, 2021
    Date of Patent: December 27, 2022
    Assignee: Mazda Motor Corporation
    Inventors: Tatsuhiko Iwasaki, Tatsutoshi Mizobe, Yoshihiko Fujita, Keiichi Nakamura
  • Patent number: 11525488
    Abstract: An automatic transmission includes a clutch device having a clutch hub, a clutch drum, a friction plate, a piston, and a hydraulic chamber. The clutch drum includes an outer-side cylindrical portion, a disc-shaped first radial portion extending radially inwardly, an axial portion extending axially from the first radial portion, and a disc-shaped second radial portion extending radially inwardly from the axial portion. The piston includes a pressing portion disposed between the first radial portion and the friction plate side, and a disc-shaped piston radial portion extending radially inwardly from the pressing portion. The hydraulic chamber is provided radially inwardly from the axial portion and on the non-friction-plate side of the piston radial portion. A comb-teeth portion is provided at a radially intermediate portion of the piston radial portion. The axial portion and the piston radial portion intersect with each other in a comb-teeth shape.
    Type: Grant
    Filed: November 5, 2021
    Date of Patent: December 13, 2022
    Assignee: Mazda Motor Corporation
    Inventors: Tatsuhiko Iwasaki, Keiichi Nakamura, Yoshihiko Fujita, Tetsuo Yamada
  • Patent number: 11486453
    Abstract: An automatic transmission includes a clutch having a drum section, a hub, a friction plate, a piston that presses the friction plate, a hydraulic chamber to which hydraulic oil is supplied to urge the piston in a direction toward the friction plate, and a cancellation chamber to which hydraulic oil is supplied to cancel a centrifugal hydraulic pressure applied to the hydraulic oil in the hydraulic chamber, and the piston is interposed between the hydraulic chamber and the cancellation chamber. The drum section includes communication passages that extend in a radial direction and respectively communicate with the hydraulic chamber and the cancellation chamber. Of the communication passages, in the communication passage that communicates with the cancellation chamber, an adjustment member is provided at an end portion on a radially inner side, and can adjust an atmospheric air release position of the communication passage in the radial direction.
    Type: Grant
    Filed: October 28, 2021
    Date of Patent: November 1, 2022
    Assignee: Mazda Motor Corporation
    Inventors: Tatsuhiko Iwasaki, Keiichi Nakamura
  • Publication number: 20220242979
    Abstract: A method for producing a chloroprene-based polymer latex which can efficiently remove a residual volatile organic substance from the chloroprene-based polymer latex while suppressing the deposition of agglomerates is provided. In the method for producing a chloroprene-based polymer latex of the present invention, when the residual volatile organic substance comprised in the latex is volatilized and removed, a mixed fluid of one or more gases selected from the group consisting of inert gases and air, and water is contacted with the latex at a gas pressure higher than the saturated water vapor pressure, and a temperature of the mixed fluid is a temperature lower than a boiling point of water at the gas pressure.
    Type: Application
    Filed: May 13, 2020
    Publication date: August 4, 2022
    Applicant: SHOWA DENKO K.K.
    Inventors: Yuki MIURA, Yuji HASHIMOTO, Keiichi NAKAMURA
  • Publication number: 20220235151
    Abstract: Provided is a method for producing purified chloroprene-based-polymer latex which enables efficiently removing a residual volatile organic substance from chloroprene-based-polymer latex while suppressing foaming and the deposition of aggregates. The method for producing purified chloroprene-based-polymer latex of the present invention has at least the following steps (I) to (III): Step (I): a step of introducing chloroprene-based-polymer latex into a container beforehand, Step (II): a step of removing a residual volatile organic substance in the chloroprene-based-polymer latex which satisfies specific requirements (1) to (4), and Step (III): a step of collecting the latex from the container after performing the step (II) at least once, to thereby obtain purified chloroprene-based-polymer latex.
    Type: Application
    Filed: May 13, 2020
    Publication date: July 28, 2022
    Applicant: SHOWA DENKO K.K.
    Inventors: Yuki MIURA, Keiichi NAKAMURA
  • Patent number: 11398401
    Abstract: A wafer mounting table includes a first electrode and a second electrode buried inside of a ceramic substrate having a wafer mounting surface so as to be parallel to the wafer mounting surface with the first electrode closer to the wafer mounting surface than the second electrode. The wafer mounting table includes a conductive section that electrically conducts the first electrode and the second electrode. The conductive section is such that a plurality of circular members comprised of plate-shaped metal meshes parallel to the wafer mounting surface are stacked between the first electrode and the second electrode.
    Type: Grant
    Filed: February 24, 2020
    Date of Patent: July 26, 2022
    Assignee: NGK Insulators, Ltd.
    Inventors: Yuji Akatsuka, Masaki Ishikawa, Kazuhiro Nobori, Akiyoshi Hattori, Keiichi Nakamura
  • Patent number: 11390167
    Abstract: A power supply system includes a first circuit, a second circuit and a voltage controller. The first circuit includes a first power supply line connected to each of a first load, a power supply source, and a first battery. The second circuit includes a second power supply line connected to a second load and a second battery connected to the second power supply line. The voltage controller includes a DC-DC converter connected between the first power supply line and the second power supply line. The second load is able to perform a function that substitutes for at least part of a function that the first load performs. The voltage controller includes a converter control unit configured to control the DC-DC converter such that an output voltage higher than or equal to a voltage of the second battery is output to the second power supply line.
    Type: Grant
    Filed: January 5, 2021
    Date of Patent: July 19, 2022
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventor: Keiichi Nakamura
  • Publication number: 20220154780
    Abstract: An automatic transmission includes a clutch having a drum section, a hub, a friction plate, a piston that presses the friction plate, a hydraulic chamber to which hydraulic oil is supplied to urge the piston in a direction toward the friction plate, and a cancellation chamber to which hydraulic oil is supplied to cancel a centrifugal hydraulic pressure applied to the hydraulic oil in the hydraulic chamber, and the piston is interposed between the hydraulic chamber and the cancellation chamber. The drum section includes communication passages that extend in a radial direction and respectively communicate with the hydraulic chamber and the cancellation chamber. Of the communication passages, in the communication passage that communicates with the cancellation chamber, an adjustment member is provided at an end portion on a radially inner side, and can adjust an atmospheric air release position of the communication passage in the radial direction.
    Type: Application
    Filed: October 28, 2021
    Publication date: May 19, 2022
    Inventors: Tatsuhiko Iwasaki, Keiichi Nakamura
  • Publication number: 20220154782
    Abstract: An automatic transmission includes a clutch device having a clutch hub, a clutch drum, a friction plate, a piston, and a hydraulic chamber. The clutch drum includes an outer-side cylindrical portion, a disc-shaped first radial portion extending radially inwardly, an axial portion extending axially from the first radial portion, and a disc-shaped second radial portion extending radially inwardly from the axial portion. The piston includes a pressing portion disposed between the first radial portion and the friction plate side, and a disc-shaped piston radial portion extending radially inwardly from the pressing portion. The hydraulic chamber is provided radially inwardly from the axial portion and on the non-friction-plate side of the piston radial portion. A comb-teeth portion is provided at a radially intermediate portion of the piston radial portion. The axial portion and the piston radial portion intersect with each other in a comb-teeth shape.
    Type: Application
    Filed: November 5, 2021
    Publication date: May 19, 2022
    Inventors: Tatsuhiko Iwasaki, Keiichi Nakamura, Yoshihiko Fujita, Tetsuo Yamada
  • Publication number: 20220154783
    Abstract: An automatic transmission has a one-side clutch and an other-side clutch in an axial direction, the one-side clutch and the other-side clutch being aligned in the axial direction on an axis of a power transmission shaft. These clutches respectively include: drum sections; hub sections; friction plates that are engaged in an axially slidable manner between the drum sections and the hub sections; and pistons that press the friction plates. The friction plates in the one-side and other-side clutches are arranged in parallel in the axial direction. The pistons in the one-side clutch and the other-side clutch are arranged on one sides in the axial direction of the friction plates and are arranged such that axial positions thereof overlap. The piston in the other-side clutch penetrates the friction plate in the one-side clutch in the axial direction.
    Type: Application
    Filed: October 27, 2021
    Publication date: May 19, 2022
    Inventors: Tatsuhiko Iwasaki, Tatsutoshi Mizobe, Yoshihiko Fujita, Keiichi Nakamura
  • Publication number: 20220154781
    Abstract: The automatic transmission has, on an axis of a power transmission shaft: a one-side clutch including a plurality of friction plates; and an other-side clutch including a plurality of friction plate. A pressing section of a piston of the one-side clutch and a pressing section of a piston of the other-side clutch are arranged to overlap each other in an axial direction. On one side in the axial direction of the plurality of friction plates of the one-side clutch, a radial section of the piston of the one-side clutch and a radial section of the piston of the other-side clutch are arranged in parallel in the axial direction. Pressure-receiving sections of the pistons of the one-side clutch and the other-side clutch and bearing sections of the pistons of the one-side clutch and the other-side clutch are aggregated and arranged on a radially inner side.
    Type: Application
    Filed: October 29, 2021
    Publication date: May 19, 2022
    Inventors: Tatsuhiko Iwasaki, Tatsutoshi Mizobe, Yoshihiko Fujita, Keiichi Nakamura