Patents by Inventor Tatsuya Tomida
Tatsuya Tomida 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).
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Publication number: 20250135577Abstract: A laser piercing method includes emitting a bundle of laser beams to the coated portion in a beam direction, the bundle of laser beams comprising: a first laser beam having a first laser output density; and a second laser beam surrounding the first laser beam as viewed in the beam direction and having a second laser output density smaller than the first laser output density. The method includes piercing the coated portion to form a pierced hole by: melting a center portion of the workpiece on which the first laser beam is cast to generate molten material; and spraying gas to the center portion to scatter the molten material around the center portion. The method includes heating a root of a spatter by a second laser beam, the spatter being the molten material scattered, the root contacting a machined workpiece that is the workpiece with the molten material removed.Type: ApplicationFiled: December 25, 2024Publication date: May 1, 2025Applicant: Yamazaki Mazak CorporationInventors: Yuto MORI, Ryota MAEDA, Tatsuya TOMIDA, Takashi JITSUMORI
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Patent number: 12151513Abstract: A pneumatic tire includes, on a tread surface, a plurality of circumferential main grooves extending in the tread circumferential direction, and a plurality of land portions defined by circumferential main grooves adjacent in the tread width direction among the plurality of circumferential main grooves, or by the circumferential main grooves and tread edges. A widthwise groove (widthwise sipe) (circumferential sipe) includes a widened portion, on the groove bottom side (sipe bottom side), at which the groove width (sipe width) is larger than on the tread surface side. In a tire radial direction region including at least a reference depth position, the storage modulus of first tread rubber, which is a groove wall surface layer defined by the widened portion and covering at least part of the widened portion, is larger than the storage modulus of second tread rubber located in a region around the first tread rubber.Type: GrantFiled: May 27, 2020Date of Patent: November 26, 2024Assignee: BRIDGESTONE CORPORATIONInventor: Tatsuya Tomida
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Patent number: 11999198Abstract: A pneumatic tire includes, on a tread surface, a plurality of circumferential main grooves extending in the tread circumferential direction, and a plurality of land portions each defined between circumferential main grooves adjacent in the tread width direction among the plurality of circumferential main grooves, or by a circumferential main groove and a tread edge. A widthwise groove (widthwise sipe) (circumferential sipe) includes a widened portion, on the groove bottom side (sipe bottom side), at which the groove width (sipe width) is larger than on the tread surface side. The storage modulus of tread rubber located in a tire radial direction region including at least a reference depth position is larger than a storage modulus of tread rubber located in regions inward and outward in the tire radial direction from the tire radial direction region.Type: GrantFiled: May 27, 2020Date of Patent: June 4, 2024Assignee: BRIDGESTONE CORPORATIONInventor: Tatsuya Tomida
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Publication number: 20230001743Abstract: A pneumatic tire of the present disclosure includes, on a tread surface, circumferential main grooves extending in a tire circumferential direction and land portions defined between circumferential main grooves adjacent in a tire width direction among the circumferential main grooves or by the circumferential main grooves and tread edges. The land portions include widthwise grooves extending in the tire width direction and are divided into blocks by the widthwise grooves. At least one widthwise sipe extending in the tire width direction is included within the blocks. Hard rubber with a higher elastic modulus than that of tread rubber is disposed in a tire radial region including at least an opening to the tread surface of a wall defining the widthwise sipe. Microfabrication is applied in a region of the tread surface surrounding at least a portion of the opening of the widthwise sipe to the tread surface.Type: ApplicationFiled: June 22, 2020Publication date: January 5, 2023Applicant: BRIDGESTONE CORPORATIONInventor: Tatsuya TOMIDA
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Patent number: 11498370Abstract: Provided is a tire including, in a tread surface, a plurality of land portions partitioned by a circumferential main groove extending continuously in a tire circumferential direction, on at least one side in a tire width direction, and comprising, in an internal land portion located in a vehicle-installed inside half portion to a tire equatorial plane among the plurality of land portions, an internal resonator including a first auxiliary groove that terminates in the internal land portion, and a first branch groove that communicates between the first auxiliary groove and the circumferential main groove, and in the first branch groove, a hidden groove having an opening width in the tread surface that is smaller than a groove width of a groove bottom is provided adjacent to the first auxiliary groove.Type: GrantFiled: June 9, 2020Date of Patent: November 15, 2022Assignee: BRIDGESTONE CORPORATIONInventor: Tatsuya Tomida
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Publication number: 20220227180Abstract: A pneumatic tire includes, on a tread surface, a plurality of circumferential main grooves extending in the tread circumferential direction, and a plurality of land portions each defined between circumferential main grooves adjacent in the tread width direction among the plurality of circumferential main grooves, or by a circumferential main groove and a tread edge. A widthwise groove (widthwise sipe) (circumferential sipe) includes a widened portion, on the groove bottom side (sipe bottom side), at which the groove width (sipe width) is larger than on the tread surface side. The storage modulus of tread rubber located in a tire radial direction region including at least a reference depth position is larger than a storage modulus of tread rubber located in regions inward and outward in the tire radial direction from the tire radial direction region.Type: ApplicationFiled: May 27, 2020Publication date: July 21, 2022Applicant: BRIDGESTONE CORPORATIONInventor: Tatsuya TOMIDA
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Publication number: 20220227176Abstract: A pneumatic tire includes, on a tread surface, a plurality of circumferential main grooves extending in the tread circumferential direction, and a plurality of land portions defined by circumferential main grooves adjacent in the tread width direction among the plurality of circumferential main grooves, or by the circumferential main grooves and tread edges. A widthwise groove (widthwise sipe) (circumferential sipe) includes a widened portion, on the groove bottom side (sipe bottom side), at which the groove width (sipe width) is larger than on the tread surface side. In a tire radial direction region including at least a reference depth position, the storage modulus of first tread rubber, which is a groove wall surface layer defined by the widened portion and covering at least part of the widened portion, is larger than the storage modulus of second tread rubber located in a region around the first tread rubber.Type: ApplicationFiled: May 27, 2020Publication date: July 21, 2022Applicant: BRIDGESTONE CORPORATIONInventor: Tatsuya TOMIDA
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Patent number: 11207925Abstract: This disclosure aims to provide a tire having excellent braking performance on dry road surface and on wet road surface, and having excellent steering stability. This disclosure is a tire comprising a tread 10, wherein: the tread 10 has a plurality of circumferential grooves extending continuously in a tire circumferential direction C, the circumferential grooves including circumferential main grooves 21a, 21b, 22 with a cross-sectional area in a tire width direction W of 10 mm2 or more, and a groove width Lb at a 95% groove depth position with a groove depth of a groove bottom as 100% of at least the circumferential groove 21a located on an outermost side when mounted to a vehicle among the circumferential main grooves 21a, 21b, 22 being 25% to 60% with respect to a groove width Lt on a tread surface.Type: GrantFiled: March 30, 2016Date of Patent: December 28, 2021Assignee: BRIDGESTONE CORPORATIONInventors: Tatsuya Tomida, Hideyuki Sakurai
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Publication number: 20200298626Abstract: Provided is a tire including, in a tread surface, a plurality of land portions partitioned by a circumferential main groove extending continuously in a tire circumferential direction on at least one side in a tire width direction, and comprising, in an internal land portion located in a vehicle-installed inside half portion to a tire equator plane among the plurality of land portions, a resonator including an auxiliary groove that terminates in the internal land portion, and a branch groove that communicates between the auxiliary groove and the circumferential main groove, and a hidden groove having an opening width in the tread surface that is smaller than a groove width of a groove bottom is provided in at least a part of the auxiliary groove.Type: ApplicationFiled: June 9, 2020Publication date: September 24, 2020Applicant: BRIDGESTONE CORPORATIONInventor: Tatsuya TOMIDA
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Publication number: 20200298628Abstract: Provided is a tire including, in a tread surface, a plurality of land portions partitioned by a circumferential main groove extending continuously in a tire circumferential direction, on at least one side in a tire width direction, and comprising, in an internal land portion located in a vehicle-installed inside half portion to a tire equatorial plane among the plurality of land portions, an internal resonator including a first auxiliary groove that terminates in the internal land portion, and a first branch groove that communicates between the first auxiliary groove and the circumferential main groove, and in the first branch groove, a hidden groove having an opening width in the tread surface that is smaller than a groove width of a groove bottom is provided adjacent to the first auxiliary groove.Type: ApplicationFiled: June 9, 2020Publication date: September 24, 2020Applicant: BRIDGESTONE CORPORATIONInventor: Tatsuya TOMIDA
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Patent number: 10493803Abstract: A pneumatic radial tire for passenger vehicles. When the tire is fitted on a rim and having an internal pressure of 250 kPa or higher, the section width SW and the outer diameter OD of the tire satisfy a predetermined relationship. A center land row is a rib-shaped land, and has center lug grooves each opening into one of the two circumferential main grooves and terminating within the center land row. Outer land rows are rib-shaped lands, each outer land row having outer lug grooves and outer auxiliary lug grooves. The outer lug grooves each open into a ground contact end in the tire width direction and terminate within the outer land row. The outer auxiliary lug grooves open into the circumferential main groove defining the outer land row, has a groove width smaller than the groove width of the outer lug grooves, and extend in the tread width direction.Type: GrantFiled: January 24, 2014Date of Patent: December 3, 2019Assignee: BRIDGESTONE CORPORATIONInventor: Tatsuya Tomida
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Publication number: 20180111424Abstract: This disclosure aims to provide a tire having excellent braking performance on dry road surface and on wet road surface, and having excellent steering stability. This disclosure is a tire comprising a tread 10, wherein: the tread 10 has a plurality of circumferential grooves extending continuously in a tire circumferential direction C, the circumferential grooves including circumferential main grooves 21a, 21b, 22 with a cross-sectional area in a tire width direction W of 10 mm2 or more, and a groove width Lb at a 95% groove depth position with a groove depth of a groove bottom as 100% of at least the circumferential groove 21a located on an outermost side when mounted to a vehicle among the circumferential main grooves 21a, 21b, 22 being 25% to 60% with respect to a groove width Lt on a tread surface.Type: ApplicationFiled: March 30, 2016Publication date: April 26, 2018Applicant: BRIDGESTONE CORPORATIONInventors: Tatsuya TOMIDA, Hideyuki SAKURAI
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Publication number: 20180111422Abstract: This disclosure aims to provide a tire having excellent braking performance on dry road surface and on wet road surface, and having excellent steering stability. This disclosure is a tire comprising a tread 10 formed by using a rubber composition of which a tan ? at 0° C. is 0.25 to 0.55, a difference between a tan ? at 30° C. and a tan ? at 60° C. is ?0.02 to 0.07, and a dynamic storage modulus at a dynamic strain of 1% and 0° C. is 4 MPa to 20 MPa, wherein: the tread 10 has circumferential grooves 20 extending in a tire circumferential direction C; a negative ratio in a footprint is 15% to 25%; a negative ratio derived from the circumferential grooves 20 is 8% to 14%; and a negative ratio derived from grooves other than the circumferential grooves is 7% to 11%.Type: ApplicationFiled: March 30, 2016Publication date: April 26, 2018Applicant: BRIDGESTONE CORPORATIONInventors: Tatsuya TOMIDA, Hideyuki SAKURAI
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Patent number: 9393842Abstract: An object of the present invention is to provide a tire exhibiting improved braking and driving performances on each of an icy/snowy road surface and a dry road surface.Type: GrantFiled: March 13, 2014Date of Patent: July 19, 2016Assignee: BRIDGESTONE CORPORATIONInventor: Tatsuya Tomida
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Publication number: 20150367684Abstract: A pneumatic radial tire for passenger vehicles. When the tire is fitted on a rim and having an internal pressure of 250 kPa or higher, the section width SW and the outer diameter OD of the tire satisfy a predetermined relationship. A center land row is a rib-shaped land, and has center lug grooves each opening into one of the two circumferential main grooves and terminating within the center land row. Outer land rows are rib-shaped lands, each outer land row having outer lug grooves and outer auxiliary lug grooves. The outer lug grooves each open into a ground contact end in the tire width direction and terminate within the outer land row. The outer auxiliary lug grooves open into the circumferential main groove defining the outer land row, has a groove width smaller than the groove width of the outer lug grooves, and extend in the tread width direction.Type: ApplicationFiled: January 24, 2014Publication date: December 24, 2015Applicant: BRIDGESTONE CORPORATIONInventor: Tatsuya TOMIDA
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Publication number: 20140290815Abstract: An object of the present invention is to provide a tire exhibiting improved braking and driving performances on each of an icy/snowy road surface and a dry road surface.Type: ApplicationFiled: March 13, 2014Publication date: October 2, 2014Applicant: BRIDGESTONE CORPORATIONInventor: Tatsuya TOMIDA
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Patent number: 8820374Abstract: A tire, wherein, a lateral groove (7) is disposed between a predetermined land block (5) and a land block (6) adjacent to the land block (5) in the tire circumference direction, among land blocks (4, 5, 6), and is formed of an inner lateral groove (Q) and an outer lateral groove (P), the inside lateral groove (Q) being disposed at an inside of a boundary of a bent portion (12) in a tire width direction, the outside lateral groove (P) being disposed at an outside of the bent portion (12), the bent portion (12) being formed at intermediate portion in the tire width direction. The angle ?1 of the inner lateral groove (Q) relative to the tire circumference direction is smaller than the angle ?2 of the outer lateral groove (P) relative to the circumference direction.Type: GrantFiled: October 21, 2009Date of Patent: September 2, 2014Assignee: Bridgestone CorporationInventor: Tatsuya Tomida
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Publication number: 20110247739Abstract: A tire, wherein, a lateral groove (7) is disposed between a predetermined land block (5) and a land block (6) adjacent to the land block (5) in the tire circumference direction, among land blocks (4, 5, 6), and is formed of an inner lateral groove (Q) and an outer lateral groove (P), the inside lateral groove (Q) being disposed at an inside of a boundary of a bent portion (12) in a tire width direction, the outside lateral groove (P) being disposed at an outside of the bent portion (12), the bent portion (12) being formed at intermediate portion in the tire width direction. The angle ?1 of the inner lateral groove (Q) relative to the tire circumference direction is smaller than the angle ?2 of the outer lateral groove (P) relative to the circumference direction.Type: ApplicationFiled: October 21, 2009Publication date: October 13, 2011Applicant: BRIDGESTONE CORPORATIONInventor: Tatsuya Tomida
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Patent number: D713330Type: GrantFiled: August 23, 2012Date of Patent: September 16, 2014Assignee: Bridgestone CorporationInventors: Tatsuya Tomida, Shungo Fujita, Jon Stuckey, Takayuki Fukunaga