Patents by Inventor Hiroaki Hamamoto

Hiroaki Hamamoto 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: 11414835
    Abstract: A working machine includes a hydraulic device, an operation valve to supply operation fluid to operate the hydraulic device and to vary the operation fluid to be supplied to the hydraulic device, an operation device having an operation member supported swingably, the operation device being configured to output an operation signal in accordance with an operation amount of the operation member, and a controller including a swing calculator to calculate an evaluation value representing a degree of swinging of the operation member, and a control signal generator to generate a control signal based on the evaluation value and the operation signal.
    Type: Grant
    Filed: October 21, 2020
    Date of Patent: August 16, 2022
    Assignee: KUBOTA CORPORATION
    Inventors: Masahiro Toyama, Ryuki Nishimoto, Yuji Fukuda, Kohei Nagao, Ryota Hamamoto, Hiroaki Nakagawa
  • Patent number: 11371215
    Abstract: A working machine includes a first traveling fluid line through which operation fluid applied to a first pressure receiving portion when a traveling operation member is operated, a second traveling fluid line through which operation fluid applied to a second pressure receiving portion when the traveling operation member is operated, a third traveling fluid line through which operation fluid applied to a third pressure receiving portion when the traveling operation member is operated, a fourth traveling fluid line through which operation fluid applied to a fourth pressure receiving portion when the traveling operation member is operated, and a controller configured or programed to judge, first, second, third and fourth pilot pressures, whether the traveling operation member is operated in a direction corresponding to any of spin-turn, pivotal-turn and straight-traveling.
    Type: Grant
    Filed: August 9, 2021
    Date of Patent: June 28, 2022
    Assignee: KUBOTA CORPORATION
    Inventors: Yuji Fukuda, Kohei Nagao, Ryota Hamamoto, Hiroaki Nakagawa, Yoshimitsu Tanaka
  • Publication number: 20170174546
    Abstract: A glass melt production apparatus, which comprises a melting vessel, a vacuum degassing apparatus, a first conducting pipe structure connecting the melting vessel and the vacuum degassing apparatus, and a second conducting pipe structure to introduce a glass melt to a forming means, provided downstream the vacuum degassing apparatus; the vacuum degassing apparatus having an uprising pipe through which the glass melt from the melting vessel ascends, a vacuum degassing vessel, and a downfalling pipe through which the glass melt from the vacuum degassing vessel descends; the flow path of the glass melt in the uprising pipe, the vacuum degassing vessel and the downfalling pipe being made of a refractory material; the first conducting pipe structure having an upstream pit to supply the glass melt to the uprising pipe; and the second conducting pipe structure having a downstream pit containing the glass melt from the downfalling pipe; the glass melt production apparatus further comprising a third conducting pipe st
    Type: Application
    Filed: March 3, 2017
    Publication date: June 22, 2017
    Applicant: ASAHI GLASS COMPANY, LIMITED
    Inventors: Hiroaki HAMAMOTO, Suguru KOBAYASHI, Michito SASAKI, Takashi KUBO, Wataru MIYOSHI, Kazuo NINOMIYA
  • Patent number: 9637407
    Abstract: There are provided a conduit structure for molten glass, a vacuum degassing apparatus using the conduit structure, and a process for vacuum-degassing molten glass by use of the vacuum degassing apparatus, wherein without using a cooling system, solid thermal insulating materials constituting a backup for the conduit are prevented from being corroded by molten glass oozing out of a joint between adjacent fused cast refractories constituting the conduit, and wherein production cost is reduced.
    Type: Grant
    Filed: October 23, 2015
    Date of Patent: May 2, 2017
    Assignee: Asahi Glass Company, Limited
    Inventors: Kensuke Nagai, Hiroaki Hamamoto, Shuji Kabashima
  • Publication number: 20170081233
    Abstract: To facilitate a preheating operation in a vacuum degassing apparatus having a flow path of a glass melt in an uprising pipe, a vacuum degassing vessel and a downfalling pipe constituted by a refractory material. Flow of a glass melt G between a melting vessel 100 and an upstream pit 210 of a first conducting pipe structure connected to a vacuum degassing vessel 320 is shut off, and in a state where the flow of the glass melt G in a by-pass 500 for the glass melt G is shut off by a first closing means 220, a combustion gas from preheating burners 530, 540 is introduced to the by-pass 500 to preheat the flow path of the glass melt G in an uprising pipe 330, the vacuum degassing vessel 320 and a downfalling pipe 340.
    Type: Application
    Filed: December 5, 2016
    Publication date: March 23, 2017
    Applicant: Asahi Glass Company, Limited
    Inventors: Hiroaki HAMAMOTO, Suguru Kobayashi, Takahisa Nagata, Satoshi Abiko, Michito Sasaki, Kazuo Ninomiya
  • Patent number: 9505645
    Abstract: It is an object of the present invention to provide a vacuum degassing apparatus configured so as to be capable of carrying out more simply exchange operation for an extension pipe made of heat-resisting metal and immersed in molten glass. The present invention includes a vacuum housing, a vacuum vessel, an introduction pipe and a discharge pipe which are assembled by a plurality of bricks, and an extension pipe connected to at least one of the introduction pipe and the discharge pipe and made of heat-resisting metal. The extension pipe is constituted by a base end portion, a body portion formed so as to be continuous to the base end portion, and a sealing flange extending from an outer peripheral side of the body portion.
    Type: Grant
    Filed: August 28, 2013
    Date of Patent: November 29, 2016
    Assignee: Asahi Glass Company, Limited
    Inventors: Wataru Miyoshi, Hiroaki Hamamoto, Suguru Kobayashi, Toshiyuki Uematsu, Michito Sasaki
  • Publication number: 20160039702
    Abstract: There are provided a conduit structure for molten glass, a vacuum degassing apparatus using the conduit structure, and a process for vacuum-degassing molten glass by use of the vacuum degassing apparatus, wherein without using a cooling system, solid thermal insulating materials constituting a backup for the conduit are prevented from being corroded by molten glass oozing out of a joint between adjacent fused cast refractories constituting the conduit, and wherein production cost is reduced.
    Type: Application
    Filed: October 23, 2015
    Publication date: February 11, 2016
    Applicant: ASAHI GLASS COMPANY, LIMITED
    Inventors: Kensuke NAGAI, Hiroaki HAMAMOTO, Shuji KABASHIMA
  • Patent number: 9073772
    Abstract: A conduit structure for molten glass, in which molten glass is flown through a double-pipe structure, with little stress loading even for a long time operation. A supporting rib connecting an inner pipe and an outer pipe is employed in the double pipe structure having the inner pipe and outer pipe in the conduit structure for molten glass, wherein excessive stress concentration hardly occurs in an inner pipe-joint portion, an outer pipe-joint portion and the rib when the rib is applied with a stress load due to the weight of the inner pipe.
    Type: Grant
    Filed: February 4, 2013
    Date of Patent: July 7, 2015
    Assignee: Asahi Glass Company, Limited
    Inventors: Takahiro Nagata, Wataru Miyoshi, Hajime Itoh, Hiroaki Hamamoto, Michito Sasaki
  • Patent number: 8720229
    Abstract: A vacuum degassing apparatus having a throughput of at least 200 tons/day without causing problems such as a stagnation of molten glass flow in the molten glass flow path, an increment of flow rate of the molten glass flow in a local area, an excessive increment of pressure loss of the molten glass flow. A vacuum degassing apparatus comprises a vacuum degassing vessel, and an uprising pipe and a downfalling pipe which are connected with the vacuum degassing vessel, wherein the vacuum degassing vessel includes a wide portion for providing a molten glass flow path, and in the wide portion, the proportion W1/L1 of the breadth of molten glass flow path W1 to the length of molten glass flow path L1 is at least 0.
    Type: Grant
    Filed: October 1, 2010
    Date of Patent: May 13, 2014
    Assignee: Asahi Glass Company, Limited
    Inventors: Rei Kitamura, Hironobu Yamamichi, Hiroaki Hamamoto, Hajime Itoh, Housaku Yonetsu
  • Publication number: 20130340478
    Abstract: It is an object of the present invention to provide a vacuum degassing apparatus configured so as to be capable of carrying out more simply exchange operation for an extension pipe made of heat-resisting metal and immersed in molten glass. The present invention includes a vacuum housing, a vacuum vessel, an introduction pipe and a discharge pipe which are assembled by a plurality of bricks, and an extension pipe connected to at least one of the introduction pipe and the discharge pipe and made of heat-resisting metal. The extension pipe is constituted by a base end portion, a body portion formed so as to be continuous to the base end portion, and a sealing flange extending from an outer peripheral side of the body portion.
    Type: Application
    Filed: August 28, 2013
    Publication date: December 26, 2013
    Applicant: Asahi Glass Company, Limited
    Inventors: Wataru MIYOSHI, Hiroaki Hamamoto, Suguru Kobayashi, Toshiyuki Uematsu, Michito Sasaki
  • Publication number: 20110016922
    Abstract: A vacuum degassing apparatus having a throughput of at least 200 tons/day without causing problems such as a stagnation of molten glass flow in the molten glass flow path, an increment of flow rate of the molten glass flow in a local area, an excessive increment of pressure loss of the molten glass flow. A vacuum degassing apparatus comprises a vacuum degassing vessel, and an uprising pipe and a downfalling pipe which are connected with the vacuum degassing vessel, wherein the vacuum degassing vessel includes a wide portion for providing a molten glass flow path, and in the wide portion, the proportion W1/L1 of the breadth of molten glass flow path W1 to the length of molten glass flow path L1 is at least 0.
    Type: Application
    Filed: October 1, 2010
    Publication date: January 27, 2011
    Applicant: ASAHI GLASS COMPANY, LIMITED
    Inventors: Rei KITAMURA, Hironubu YAMAMICHI, Hiroaki HAMAMOTO, Hajime ITOH, Housaku YONETSU
  • Publication number: 20100251772
    Abstract: The present invention is to provide a molten glass producing apparatus realizing simultaneously the production of a glass article of high quality and save-energy in producing molten glass, a molten glass producing method employing the molten glass producing apparatus and a method for producing a glass article. In the molten glass producing apparatus having a vacuum degassing apparatus, the melting tank is provided with a separating means for separating the area for circulating the molten glass in the melting tank into an upstream circulation flow and a downstream circulation flow, the distance from the separating means to the downstream end of the molten glass flow path in the melting tank is from 0.1 LE to 0.
    Type: Application
    Filed: June 22, 2010
    Publication date: October 7, 2010
    Applicant: ASAHI GLASS COMPANY, LIMITED
    Inventors: Hajime Itoh, Hironobu Yamamichi, Toru Nishikawa, Kazuo Ninomiya, Hiroaki Hamamoto