Patents by Inventor Tatsuya Nakai

Tatsuya Nakai 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: 20210379850
    Abstract: A vulcanization mold including blades having a distal end side and pullout is performed smoothly without causing any failure and a pneumatic tire. A vulcanization mold in which a blade has a proximal end, a blade distal end side expanded in a thicknesswise direction on the distal end side, and a blade connection portion that connects the proximal end portion and the blade distal end side is a vulcanization mold in which a sweep area is the difference where a cross sectional area of the blade connection is subtracted from an area blade distal end side to a mold surface with a width equal to a maximum width of a thickness of the blade distal end side in a cross sectional shape perpendicular to a tire widthwise direction of the blade is smaller in circumferential end side regions than in a circumferential central side region of the sector mold.
    Type: Application
    Filed: November 15, 2019
    Publication date: December 9, 2021
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Tatsuhiko HATANO, Yasuo SHIBATA, Tatsuya NAKAI
  • Publication number: 20210379849
    Abstract: A vulcanization mold is a mold including blades having a distal end side thick portion and pullout is performed smoothly by the mold without causing any failure, and a pneumatic tire. A vulcanization mold in which a blade or has a blade proximal end portion, a blade distal end side thick portion expanded in a thicknesswise direction on the distal end side, and a blade connection portion that connects the blade proximal end portion and the blade distal end side thick portion to each other is a vulcanization mold in which a blade density that is a number of blades implanted on a sector mold per unit length in a circumferential direction is lower at the blades in circumferential end portion side regions than at the blades in a circumferential central portion side region of the sector mold. Further, a pneumatic tire is manufactured using the vulcanization mold.
    Type: Application
    Filed: November 15, 2019
    Publication date: December 9, 2021
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Tatsuhiko HATANO, Yasuo SHIBATA, Tatsuya NAKAI
  • Publication number: 20210379848
    Abstract: A vulcanization mold in which a blade has a blade proximal end portion, a blade distal end side thick portion expanded in a thicknesswise direction on the distal end side, and a blade connection portion that connects the portions to each other, is a vulcanization mold wherein a sweep area that is the difference where a cross sectional area of the blade connection portion is subtracted from an area from the blade distal end side thick portion to a mold surface with a width equal to a maximum width of a thickness of the blade distal end side thick portion in a cross sectional shape perpendicular to a tire widthwise direction of the blade is smaller at the blades in circumferential end portion side regions than at the blades in a circumferential central portion side region of the sector mold. Further, a pneumatic tire is manufactured using the vulcanization mold.
    Type: Application
    Filed: November 15, 2019
    Publication date: December 9, 2021
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Tatsuhiko HATANO, Yasuo SHIBATA, Tatsuya NAKAI
  • Publication number: 20190118584
    Abstract: A tire having excellent motion performance on both a dry road surface and a wet road surface. A tire includes a tread having a tread surface on which one or more land portions are defined by two or more circumferential grooves extending in a circumferential direction of the tread, wherein the one or more land portions each have a plurality of sipes extending in a direction traversing an equator of the tire and spaced from each other in the circumferential direction of the tread, and a dynamic elastic modulus E? at 30° C. of a rubber composition forming the one or more land portions, a number N of the plurality of sipes, and a depth D of the circumferential grooves satisfy 0.009?E?/(N×D)?0.029.
    Type: Application
    Filed: March 16, 2017
    Publication date: April 25, 2019
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Tatsuya NAKAI, Ietomo MATSUNAGA, Kazuhiro MAEKAWA
  • Patent number: 10245892
    Abstract: An object is to improve noise performance of a tire while enhancing movement performance thereof. At least one of the land portions (20) includes an outer wall surface (30) positioned on a vehicle outer side, an inner wall surface (31) positioned on a vehicle inner side, a tread surface (32) on an outer side in a tire radial direction, an outer edge (33) of the tread surface (32) in contact with the outer wall surface (30), and an inner edge (34) of the tread surface (32) in contact with the inner wall surface (31). The tread surface (32) is formed in a convex shape which is smoothly curved between the outer edge (33) and the inner edge (34) and which has a top portion (43) most protruded outward in the tire radial direction, in a cross section of the land portion (20) in a tire width direction.
    Type: Grant
    Filed: June 30, 2014
    Date of Patent: April 2, 2019
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Tadashi Wakiyama, Shoji Hayashi, Ietomo Matsunaga, Masaki Wada, Masafumi Koide, Tatsuya Nakai
  • Publication number: 20160236519
    Abstract: An object is to improve noise performance of a tire while enhancing movement performance thereof. At least one of the land portions (20) includes an outer wall surface (30) positioned on a vehicle outer side, an inner wall surface (31) positioned on a vehicle inner side, a tread surface (32) on an outer side in a tire radial direction, an outer edge (33) of the tread surface (32) in contact with the outer wall surface (30), and an inner edge (34) of the tread surface (32) in contact with the inner wall surface (31). The tread surface (32) is formed in a convex shape which is smoothly curved between the outer edge (33) and the inner edge (34) and which has a top portion (43) most protruded outward in the tire radial direction, in a cross section of the land portion (20) in a tire width direction.
    Type: Application
    Filed: June 30, 2014
    Publication date: August 18, 2016
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Tadashi WAKIYAMA, Shoji HAYASHI, Ietomo MATSUNAGA, Masaki WADA, Masafumi KOIDE, Tatsuya NAKAI
  • Patent number: 9285293
    Abstract: Disclosed is a method for predicting tire performance in which a tire model, which comprises a tread pattern capable of imparting deformation by means of ground contact and/or transfer, and a snow model, in which a snow-covered road surface that comes into contact with the tire model is represented, are used to predict tire performance on the snow-covered road surface on the basis of physical quantities that occur in at least either of the tire model and the snow model. The snow model is modeled as an elasto-plastic body or an elastic body, the nonlinearity of the volume compression property of snow is represented by the relationship between the density or volume strain of the snow and the pressure of the snow, and the shear property of the snow is represented by the relationship between the yield stress of the snow and the pressure of the snow.
    Type: Grant
    Filed: July 22, 2011
    Date of Patent: March 15, 2016
    Assignees: BRIDGESTONE CORPORATION, WSL INSTITUTE FOR SNOW AND AVALANCHE RESEARCH SLF
    Inventors: Eisuke Seta, Tatsuya Nakai, Martin Schneebeli, Denes Szabo, Henning Loewe, Martin Heggli, Felix Hempel, Matthias Jaggi, Jorg Graupeter
  • Publication number: 20130124172
    Abstract: Disclosed is a method for predicting tire performance in which a tire model, which comprises a tread pattern capable of imparting deformation by means of ground contact and/or transfer, and a snow model, in which a snow-covered road surface that comes into contact with the tire model is represented, are used to predict tire performance on the snow-covered road surface on the basis of physical quantities that occur in at least either of the tire model and the snow model. The snow model is modeled as an elasto-plastic body or an elastic body, the nonlinearity of the volume compression property of snow is represented by the relationship between the density or volume strain of the snow and the pressure of the snow, and the shear property of the snow is represented by the relationship between the yield stress of the snow and the pressure of the snow.
    Type: Application
    Filed: July 22, 2011
    Publication date: May 16, 2013
    Applicants: WSL INSTITUTE FOR SNOW AND AVALANCHE RESEARCH SLF, BRIDGESTONE CORPORATION
    Inventors: Eisuke Seta, Tatsuya Nakai, Martin Schneebeli, Denes Szabo, Henning Loewe, Martin Heggli, Felix Hempel, Matthias Jaggi, Jorg Graupeter
  • Patent number: 7553865
    Abstract: An object of the present invention is to provide an indomethacin external preparation that has an excellent use feeling and excellent absorbability and causes no phase separation into an oil layer and an aqueous layer, thus exhibiting satisfactory stability of preparation with time. Provided is an indomethacin external preparation containing: 0.1 to 3 wt % of indomethacin; 25 to 50 wt % of alcohol; 0.01 to 5 wt % of gelling agent; 5 to 30 wt % of oil component; 20 to 50 wt % of water; and 0.01 to 10 wt % of one or more components selected from the group consisting of glyceryl monostearate, sorbitan monostearate, stearyl alcohol, and polyethylene glycol monostearate.
    Type: Grant
    Filed: July 22, 2003
    Date of Patent: June 30, 2009
    Assignee: Kowa Company, Ltd.
    Inventors: Hiroyuki Shirai, Tatsuya Nakai, Masami Serizawa, Yasuo Shinoda, Toshio Inagi
  • Publication number: 20070166360
    Abstract: An external preparation comprising following ingredients (A) and (B): (A) a compound represented by the following general formula (1) wherein R1 represents an organic residue having a cyclic structure that may have a substituent; R2 represents a hydrogen atom or a lower alkyl group; and X represents an ethylene group or an ethenylene group or a salt thereof, and (B) a monoterpene. The external preparation of the present invention is excellent in percutaneous absorbability.
    Type: Application
    Filed: March 30, 2005
    Publication date: July 19, 2007
    Applicants: Kowa Co., Ltd., Nissan Chemical Industries, Ltd.
    Inventors: Tatsuya Nakai, Makoto Kanebako
  • Publication number: 20050239868
    Abstract: An object of the present invention is to provide an indomethacin external preparation that has an excellent use feeling and excellent absorbability and causes no phase separation into an oil layer and an aqueous layer, thus exhibiting satisfactory stability of preparation with time. Provided is an indomethacin external preparation containing: 0.1 to 3 wt % of indomethacin; 25 to 50 wt % of alcohol; 0.01 to 5 wt % of gelling agent; 5 to 30 wt % of oil component; 20 to 50 wt % of water; and 0.01 to 10 wt % of one or more components selected from the group consisting of glyceryl monostearate, sorbitan monostearate, stearyl alcohol, and polyethylene glycol monostearate.
    Type: Application
    Filed: July 22, 2003
    Publication date: October 27, 2005
    Inventors: Hiroyuki Shirai, Tatsuya Nakai, Masami Serizawa, Yasuo Shinoda, Toshio Inagi
  • Patent number: 5801671
    Abstract: A liquid crystal display panel 51 of N rows.times.M columns is driven by a segment driver 52 with two different voltages VS1, VS2, and by a common driver 53 with three voltages VC1, VC2, VC3. An output voltage waveform of the segment driver 52 is modulated for gradation display. The two different voltages VS1, VS2 are selected to be low voltages so as not to require high withstand voltage process in the segment driver 52, which makes it easier to integrated to a large scale in the case of realizing the segment driver 52 as a semiconductor integrated circuit.
    Type: Grant
    Filed: April 12, 1996
    Date of Patent: September 1, 1998
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Masakazu Kobayashi, Tatsuya Nakai, Hiroyuki Hirashima, Masahiko Monomohshi, Yoshiki Sano
  • Patent number: 5483867
    Abstract: A swash plate type compressor incorporating therein a swash plate having an annular rail raised from each flat face thereof for providing a sliding-contact surface being in contact with sliding-contact surface portions of respective shoes which constitute a rotation-to-reciprocation conversion unit arranged between the swash plate and double-headed pistons reciprocating axial cylinder bores of the compressor. The sliding-contact surfaces of respective shoes bulge outward and have a radius of curvature "R" in the range of 800 through 1600 millimeters which is smaller than that of the conventional shoes of a swash plate type compressor, so that relatively large wedge shaped gaps are formed between the respective shoes and the swash plate to thereby stably and constantly hold lubricating oil.
    Type: Grant
    Filed: September 27, 1994
    Date of Patent: January 16, 1996
    Assignee: Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
    Inventors: Hayato Ikeda, Tatsuya Nakai, Naoya Yokomachi, Masanobu Yokoi
  • Patent number: 4844703
    Abstract: A variable displacement vane compressor for an air conditioning system having at least one crescent chamber (R1, R2) defined by vanes (8), a rotor (6), and a bore of a cylindrical body (3). The cooling capacity is adjusted by rotational displacement of an annular plate member (21) for controlling the amount of refrigerant introduced into the crescent chamber (R1, R2). The annular plate member (21) is rotated by a spool (25) driven by a dynamic pressure balance between a first compartment (S1) to which a refrigerant gas under a discharging pressure is introduced, and of a second compartment (S2) to which an oil under a discharging pressure is introduced. The spool (25) is connected to the annular plate member (21) through a pin (26) penetrating an arcuate slot 27 formed in a front end wall plate member (4).
    Type: Grant
    Filed: July 28, 1988
    Date of Patent: July 4, 1989
    Assignee: Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
    Inventors: Yasushi Watanabe, Tatsuya Nakai, Shinichi Suzuki, Masahiro Kawaguchi
  • Patent number: 4838740
    Abstract: A variable displacement vane compressor including a rotor rotatably supported between a pair of side plates secured to a cylinder, vanes movably supported in the rotor to define variable compression chambers in the cylinder, a reciprocally rotatable displacement control plate located between the rotor and one of the side plates for controlling the largest displacement of the compression chambers when closed, a spool chamber provided in one side plate and opposed to the displacement control plate, a spool which reciprocates in the spool chamber to define a first pressure chamber in which a refrigerant having a discharge pressure is introduced and a second pressure chamber in which an oil having the discharge pressure is introduced through a control valve unit in response to the suction pressure, the spool and the displacement control plate being interconnected by a connecting member and moving together, a seal ring between the displacement control plate and the one side plate, for isolating a high pressure are
    Type: Grant
    Filed: July 20, 1988
    Date of Patent: June 13, 1989
    Assignee: Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
    Inventors: Yasushi Watanabe, Masahiro Kawaguchi, Shinichi Suzuki, Tatsuya Nakai
  • Patent number: 4808083
    Abstract: A variable capacity type vane compressor comprising a cylinder having an oblong cylinder bore and a rotor with radial vanes rotatably inserted in the cylinder so that the radially outer ends of the vanes are in slidable contact with the cylinder bore surface to form compression chambers therebetween. A movable capacity control disk is arranged at an interface between one side plate and the rotor to control the quantity of introduced gas and/or returned compressed gas to vary a capacity of the compressor. The capacity control disk is moved by a spool actuator inserted in a spool cylinder having opposed working chambers. Gas under output pressure is introduced into the first working chamber, and oil under output pressure is introduced into the second working chamber, while a leak passage relieves the oil pressure to an intermediate pressure.
    Type: Grant
    Filed: January 29, 1988
    Date of Patent: February 28, 1989
    Assignee: Toyota Jidoshokki Seisakusho Kabushiki Kaisha
    Inventors: Yasushi Watanabe, Tatsuya Nakai, Shinichi Suzuki, Masahiro Kawaguchi