Patents by Inventor Yuji Nagao

Yuji Nagao 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: 12168859
    Abstract: A working machine includes a controller to perform an automatic deceleration operation to automatically decelerate from a second speed to a first speed when a value calculated based on a first traveling pressure, a second traveling pressure, a third traveling pressure, and a fourth traveling pressure becomes equal to or more than a deceleration threshold in a state where a left traveling motor and a right traveling motor are being driven at the second speed.
    Type: Grant
    Filed: June 25, 2021
    Date of Patent: December 17, 2024
    Assignee: KUBOTA CORPORATION
    Inventors: Yuji Fukuda, Kohei Nagao, Ryota Hamamoto, Hiroaki Nakagawa
  • Patent number: 12146296
    Abstract: A working machine includes a traveling motor that is shifted between a first speed and a second speed faster than the first speed, a traveling pump that supplies hydraulic fluid to the traveling motor, a traveling operation member operable to operate the traveling pump, and a controller including an automatic speed reduction unit that performs automatic speed reduction in which the traveling motor having been shifted to the second speed is automatically shifted from the second speed to the first speed based on the operation amount of the traveling operation member. The controller includes an automatic speed reduction restraining unit configured or programmed to restrain the automatic speed reduction from being performed when the traveling operation member is operated to steeply change the operation amount from a first operation amount to a second operation amount.
    Type: Grant
    Filed: December 14, 2021
    Date of Patent: November 19, 2024
    Assignee: KUBOTA CORPORATION
    Inventors: Kohei Nagao, Yuji Fukuda
  • Patent number: 12139888
    Abstract: A working machine includes a machine body, a traveling device provided on the machine body, an operation member operable to activate the traveling device, a camera device to capture an image of surroundings of the machine body, a display unit to display the image captured by the camera device, a notification unit to notify a traveling direction of the traveling device, and a controller to control the display unit and the notification unit so that when the operation member is operated to activate the traveling device, the display unit is controlled to display the captured image and the notification unit is controlled to notify the traveling direction. The controller delays either one of a first timing when the display unit starts to display the captured image and a second timing when the notification unit starts to notify the traveling direction later than the other.
    Type: Grant
    Filed: June 25, 2021
    Date of Patent: November 12, 2024
    Assignee: KUBOTA CORPORATION
    Inventors: Yuji Fukuda, Kohei Nagao, Ryota Hamamoto, Tomoyuki Noguchi
  • Patent number: 12134877
    Abstract: A working machine includes a machine body, a left traveling device located left on the machine body, a right traveling device located right on the machine body, and a controller configured or programmed to perform automatic deceleration to automatically reduce a first rotation speed of a left traveling motor and a second rotation speed of a right traveling motor by shifting a speed stage of each of the left and right traveling motors from a second speed stage to a first speed stage that is lower than the second speed stage. The controller is configured or programmed to: not perform the automatic deceleration when the first rotation speed or the second rotation speed is equal to or higher than a predetermined rotation speed; and perform the automatic deceleration when the first rotation speed and the second rotation speed are less than the predetermined rotation speed.
    Type: Grant
    Filed: December 6, 2023
    Date of Patent: November 5, 2024
    Assignee: KUBOTA CORPORATION
    Inventors: Yuji Fukuda, Kohei Nagao
  • Publication number: 20240336301
    Abstract: A working machine includes a first rotation detector to detect a first rotation speed of the left traveling motor, a second rotation detector to detect a second rotation speed of the right traveling motor, and a controller to perform automatic deceleration to automatically reduce the first rotation speed and the second rotation speed both set at respective second speed stages by shifting a speed stage of each of the first rotation speed and the second rotation speed to a first speed stage that is lower than the second speed stage. During straight traveling of a machine body of the working machine, the controller determines a straight-traveling threshold serving as a deceleration threshold for judging whether to perform the automatic deceleration based on the first rotation speed or the second rotation speed.
    Type: Application
    Filed: June 20, 2024
    Publication date: October 10, 2024
    Applicant: KUBOTA CORPORATION
    Inventors: Yuji FUKUDA, Kohei NAGAO
  • Publication number: 20240337092
    Abstract: A working machine includes a controller to: select one of pieces of operation characteristics information corresponding to respective work attachments stored in a memory that corresponds to a work attachment attached to an attachment mount portion and fluidly connected to a hydraulic fluid port; and control, based on the selected one of the pieces of operation characteristics information, the speed of switching of a work-attachment-drive control valve when starting the work attachment and/or when stopping the work attachment.
    Type: Application
    Filed: April 6, 2023
    Publication date: October 10, 2024
    Applicant: KUBOTA CORPORATION
    Inventors: Ryota HAMAMOTO, Yuji FUKUDA, Tomoyuki NOGUCHI, Kohei NAGAO
  • Patent number: 12098524
    Abstract: A working machine includes a prime mover, a traveling device, a traveling motor, a traveling pump, a circulation fluid passage, a traveling switching valve shiftable between a first state corresponding to a first speed of a hydraulic motor and a second state corresponding to a second speed of the hydraulic motor, a brake, an actuation valve configured to output the hydraulic pressure applied to the traveling pump, and change the hydraulic pressure output therefrom, and a controller configured or programmed to control the traveling switching valve, the brake and the actuation valve, and being capable of activating a first mode. The controller is configured or programmed to, when activating the first mode, shift the brake into a braking state, shift the traveling switching valve into the second state, and control the actuation valve so as to set the hydraulic pressure output from the actuation valve to a predetermined pressure.
    Type: Grant
    Filed: September 29, 2023
    Date of Patent: September 24, 2024
    Assignee: KUBOTA CORPORATION
    Inventors: Yuji Fukuda, Kohei Nagao, Hiroaki Nakagawa, Ryota Hamamoto
  • Publication number: 20240301651
    Abstract: A working machine includes: at least one support member connectable to a work attachment to do work by making contact with an object to be contacted; at least one hydraulic cylinder to move the work attachment connected to the at least one support member, a rod-side pressure detector to detect a rod-side hydraulic pressure of hydraulic fluid in communication with a rod-side fluid chamber of the at least one hydraulic cylinder; a bottom-side pressure detector to detect a bottom-side hydraulic pressure of hydraulic fluid in communication with a bottom-side fluid chamber of the at least one hydraulic cylinder; and a controller to calculate a relationship in pressure between the rod-side hydraulic pressure and the bottom-side hydraulic pressure and evaluate, based on the calculated relationship in pressure, a contact state which is a state of contact of the work attachment with the object.
    Type: Application
    Filed: March 9, 2023
    Publication date: September 12, 2024
    Applicant: KUBOTA CORPORATION
    Inventors: Kohei NAGAO, Yuji FUKUDA
  • Patent number: 12065191
    Abstract: A working machine includes a first rotation detector to detect a first rotation speed of the left traveling motor, a second rotation detector to detect a second rotation speed of the right traveling motor, and a controller to perform automatic deceleration to automatically reduce the first rotation speed and the second rotation speed both set at respective second speed stages by shifting a speed stage of each of the first rotation speed and the second rotation speed to a first speed stage that is lower than the second speed stage. During straight traveling of a machine body of the working machine, the controller determines a straight-traveling threshold serving as a deceleration threshold for judging whether to perform the automatic deceleration based on the first rotation speed or the second rotation speed.
    Type: Grant
    Filed: June 24, 2021
    Date of Patent: August 20, 2024
    Assignee: KUBOTA CORPORATION
    Inventors: Yuji Fukuda, Kohei Nagao
  • Publication number: 20140315046
    Abstract: Provided are a microbial power generation device, an electrode for the microbial power generation device, preparing methods of the same, an electric power producing method using microbes and a selective culture method of the microbes used for the electric power producing method capable of improving electric power production capacity and of suppressing power generation cost. In a microbial power generation device (1), microbes (reducing microbes) that reduce graphene oxide are enriched among microbes inhabiting wastewater, slurry, activated sludge and the like. Therefore, the graphene oxide is reduced by the reducing microbes, so the graphene is produced. Electrons produced by the microbes can be transmitted to a negative electrode (14) via the produced graphene. As a result, the electric power production capacity can be improved and the power generation can be performed at a low cost.
    Type: Application
    Filed: September 18, 2012
    Publication date: October 23, 2014
    Applicant: National University Corporation TOYOHASHI UNIVERSITY OF TECHNOLOGY
    Inventors: Naoko Yoshida, Akira Hiraishi, Adarsh Sandhu, Seiji Iwasa, Hiroshi Okada, Ryugo Tero, Yuji Nagao
  • Patent number: 8653177
    Abstract: The invention relates to a semiconductive resin composition containing at least two kinds of conductive fillers, wherein the difference in threshold values of percolation between at least two kinds of the conductive fillers is within a range of 10 to 50 mass %. The semiconductive resin composition of the present invention can be used widely in various form of molded products, such as component used for transport in a clean room, spin chuck, IC test socket, various rollers installed in copier, seamless belt, bearing, antistatic fiber, member for electrostatic coating, fuel tube, part around fuel or chemical tube.
    Type: Grant
    Filed: October 26, 2007
    Date of Patent: February 18, 2014
    Assignee: Showa Denko K.K.
    Inventors: Yuji Nagao, Ryuji Yamamoto
  • Patent number: 7879941
    Abstract: The invention relates to a heat-resistant sliding resin composition, comprising a vapor carbon fiber having a specific surface area of 10 to 50 m2/g, a mean aspect ratio of 20 to 500 and a mean fiber diameter of 50 to 200 nm and a synthetic resin, wherein a heat deflection temperature under high load (ASTM D648) is 160° C. or higher and a thermal conductivity is 0.8 W/mK or higher. The resin composition has heat resistance, heat-radiation property and sliding property. Particularly, the resin composition, which neither wears away nor abrades a soft metal member which is a counter member under high temperature and heat generative conditions, can be employed for various sliding members such as bearings.
    Type: Grant
    Filed: January 20, 2006
    Date of Patent: February 1, 2011
    Assignee: Showa Denko K.K.
    Inventors: Yuji Nagao, Ryuji Yamamoto, Satoshi Miyake
  • Publication number: 20100173108
    Abstract: The invention relates to a semiconductive resin composition containing at least two kinds of conductive fillers, wherein the difference in threshold values of percolation between at least two kinds of the conductive fillers is within a range of 10 to 50 mass %. The semiconductive resin composition of the present invention can be used widely in various form of molded products, such as component used for transport in a clean room, spin chuck, IC test socket, various rollers installed in copier, seamless belt, bearing, antistatic fiber, member for electrostatic coating, fuel tube, part around fuel or chemical tube.
    Type: Application
    Filed: October 26, 2007
    Publication date: July 8, 2010
    Applicant: SHOWA DENKO K. K.
    Inventors: Yuji NAGAO, Ryuji Yamamoto
  • Patent number: 7569161
    Abstract: The invention provides a production method of a conductive polymer, comprising a step of blending a polymer in a state of a melt viscosity of 600 Pa·s or less at a shear rate of 100 s?1 with a vapor grown carbon fiber in 1 to 15 mass at a mixing energy of 1,000 mJ/m3 or less, and a conductive polymer obtained thereby. Preferably, a vapor grown carbon fiber used has an outer fiber diameter of 80 to 500 nm, an aspect ratio of 40 to 1,000, a BET specific surface area of 4: to 30 m2/g, a do02 of 0.345 nm or less according to an X-ray diffraction method, and a ratio (Id/Ig) of 0.1 to 2 wherein Id and Ig each represent peak heights of a band ranging from 1,341 to 1,349 cm?1 and a band ranging from 1,570 to 1,578 cm?1 respectively, according to a Raman scattering spectrum. According to the invention, an excellent conductivity can be attained by compounding vapor grown carbon fiber in a smaller amount than in a conventional method.
    Type: Grant
    Filed: September 1, 2004
    Date of Patent: August 4, 2009
    Assignee: Showa Denko K.K.
    Inventors: Yuji Nagao, Ryuji Yamamoto, Toshio Morita
  • Publication number: 20080099732
    Abstract: The electroconductive resin composition comprising 1 to 30 mass % of carbon fiber having a hollow structure, an average filament diameter of 50 to 500 nm and an average aspect ratio of 50 to 1000 and 99 to 70 mass % of resin, wherein the volume ratio of carbon fiber agglomerate to one carbon fiber filament constituting the agglomerate in the resin composition (volume of carbon fiber agglomerate/volume of a carbon fiber filament) is 1500 or less according to the invention can be uniformly dispersed in resin without agglomeration and therefore, a good electroconductivity can be achieved by addition of small amount of the composition.
    Type: Application
    Filed: September 13, 2005
    Publication date: May 1, 2008
    Applicant: SHOWA DENKO K.K.
    Inventors: Yuji Nagao, Ryuji Yamamoto
  • Publication number: 20080075953
    Abstract: Conductive composites with resin, produced by mixing a vapor grown carbon fiber having a fiber diameter of 2 to 500 nm with a matrix resin in a molten state while suppressing breakage of the fiber 20% or less, exhibit conductivity higher than that of a conventional conductive composites with resin through incorporation of vapor grown carbon fiber in an amount equivalent to a conventional amount, or exhibit conductivity equal to or higher than that of a conventional conductive composites with resin through incorporation of vapor grown carbon fiber in an amount smaller than a conventional amount. In the case where the melt-mixing of the fiber with resin is performed using a co-rotating twin-screw extruder, the vapor grown carbon fiber is preferably fed to the extruder by way of side feeding. In the case where the melt-mixing is performed using a pressure kneader, resin is sufficiently melted in the kneader in advance, and vapor grown carbon fiber is fed to the molten resin.
    Type: Application
    Filed: August 30, 2005
    Publication date: March 27, 2008
    Applicant: Showa Denko K.K.
    Inventors: Yuji Nagao, Ryuji Yamamoto
  • Publication number: 20080039574
    Abstract: The invention relates to a heat-resistant sliding resin composition, comprising a vapor carbon fiber having a specific surface area of 10 to 50 m2/g, a mean aspect ratio of 20 to 500 and a mean fiber diameter of 50 to 200 nm and a synthetic resin, wherein a heat deflection temperature under high load (ASTM D648) is 160° C. or higher and a thermal conductivity is 0.8 W/mK or higher. The resin composition has heat resistance, heat-radiation property and sliding property. Particularly, the resin composition, which neither wears away nor abrades a soft metal member which is a counter member under high temperature and heat generative conditions, can be employed for various sliding members such as bearings.
    Type: Application
    Filed: January 20, 2006
    Publication date: February 14, 2008
    Applicant: SHOWA DENKO K.K.
    Inventors: Yuji Nagao, Ryuji Yamamoto, Satoshi Miyake
  • Patent number: 7273414
    Abstract: A loop track for racing objects is disposed at the center of a race game device, for example for a simulated horse race. A plurality of racing objects, such as race horses, run on the track. The X- and Y-directional positions of the race horses are detected by a separable position detecting means underlying the track. The separable position detecting means allows for easier maintenance, transport, assembly, and disassembly of the device. Information regarding the positions of the horses is displayed on a game screen. Players can write memos to themselves on individual game screens by pressing a trace over the game information on the game screen. A control unit provides game information corresponding to other races other than a current race, including future races, and players may select information corresponding to future races on the individual game screen.
    Type: Grant
    Filed: April 29, 2002
    Date of Patent: September 25, 2007
    Assignee: Sega Enterprises, Ltd.
    Inventors: Yuji Nagao, Takanori Akiyama, Naoki Kawajiri, Seiji Hayashi, Susumu Murata, Koji Yamaguchi, Yuji Ikeda, Mitsuru Todaiji, Yasuhiro Takagi, Shunichi Nakamura, Keiji Yano, Muneoki Kamata, Shingo Kataoka, Koji Osuka
  • Publication number: 20070200098
    Abstract: The present invention relates to an electrically conductive resin composition comprising a vapor grown carbon fiber (A1) having an outer fiber diameter of 80 to 500 nm and a resin (B), characterized in that: (1) the vapor grown carbon fiber (A1) has an interlayer spacing (d002) of 0.345 nm or less and an aspect ratio of 40 to 1,000, (2) the ratio by volume of the vapor grown carbon fiber (A1) to the resin (B) (i.e., A1/B) is 0.5/99.5 to 12/88, (3) the electrically conductive resin composition has a volume resistivity value of 105 ?cm or less, and (4) when the resin composition is heated at 80° C. for 30 minutes, the total amount of gases generated therefrom is 5 ppm or less. The present invention also relates to a resin molded product comprising the electrically conductive composition. The electrically conductive resin composition suppresses deposition of a molecular contaminant generated from a resin material onto the surface of a packaged device product.
    Type: Application
    Filed: April 11, 2005
    Publication date: August 30, 2007
    Inventors: Yuji Nagao, Ryuji Yamamoto
  • Publication number: 20070181855
    Abstract: A conductive composition comprising a vapor grown carbon fiber having an aspect ratio of 40 to 1,000, preferably 65 to 1,000, and a specific surface area or fiber diameter of the fiber within a predetermined range, and a preferable peak intensity ratio (I0=I1360/I1580) of 0.1 to 1, wherein I1580 represents a peak height at 1,580 cm?1 and I1360 represents a peak height at 1,360 cm?1 in a Raman scattering spectrum; and a resin composition containing the composition; and a production method thereof.
    Type: Application
    Filed: April 14, 2005
    Publication date: August 9, 2007
    Inventors: Yuji Nagao, Ryuji Yamamoto