Patents by Inventor Ryouichi Tomomatsu
Ryouichi Tomomatsu 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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Patent number: 11897291Abstract: A tread pattern of a pneumatic tire includes one center continuous land portion and two intermediate continuous land portions that are divided by four circumferential main grooves and that are not provided with lug grooves. Edges on both sides of one center main groove include groove chamfered portions having a chamfered width changing in the circumferential direction in a zigzag shape. In the regions of the intermediate continuous land portions, first sipes extending inward in the lateral direction from shoulder main grooves of the main grooves, which are positioned on outer sides in the lateral direction, are provided. The first sipes each include a sipe main body portion having a constant distance between sipe wall surfaces on a sipe bottom side and a sipe chamfered portion inclined so that the sipe wall surfaces are open toward the tread surface.Type: GrantFiled: June 30, 2022Date of Patent: February 13, 2024Assignee: The Yokohama Rubber Co., LTD.Inventor: Ryouichi Tomomatsu
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Patent number: 11685195Abstract: A tread pattern of a pneumatic tire includes continuous lands provided in half treads on first and second sides, circumferential main grooves, and sipes having a chamfered configuration. The sipes extend inward in a lateral direction from the circumferential main grooves and are closed in the middle of regions of the continuous lands. An edge shape of each of sipes on the first side includes an extending portion extending inward in the lateral direction constantly in an extension direction and a bent portion that is provided to be joined to an end of the first extending portion and that has the edge shape bent from the extension direction of the first extending portion to a direction close to the circumferential direction. Every portion of the first extending portion and the bent portion of the sipes are provided with a main body portion and a sipe chamfered portion.Type: GrantFiled: November 15, 2018Date of Patent: June 27, 2023Assignee: The Yokohama Rubber Co., Ltd.Inventor: Ryouichi Tomomatsu
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Patent number: 11548323Abstract: Steering stability performance on dry road surfaces and steering stability performance on wet road surfaces are improved. A land portion width Wcc of a center land portion (31) and a land portion width Wco of an outer side middle land portion (32) satisfy a relationship of Wcc<Wco. In addition, a ground contact surface (10) of each of the outer side middle land portion (32) and an outer side shoulder land portion (34) is formed to protrude toward an outer side in a tire radial direction with respect to a reference profile PRco, PRso, and a protruding amount Hco of the outer side middle land portion (32) and a protruding amount Hso of the outer side shoulder land portion (34) satisfy a relationship of Hco<Hso.Type: GrantFiled: July 1, 2019Date of Patent: January 10, 2023Assignee: The Yokohama Rubber Co., LTD.Inventor: Ryouichi Tomomatsu
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Publication number: 20220324265Abstract: A tread pattern of a pneumatic tire includes one center continuous land portion and two intermediate continuous land portions that are divided by four circumferential main grooves and that are not provided with lug grooves. Edges on both sides of one center main groove include groove chamfered portions having a chamfered width changing in the circumferential direction in a zigzag shape. In the regions of the intermediate continuous land portions, first sipes extending inward in the lateral direction from shoulder main grooves of the main grooves, which are positioned on outer sides in the lateral direction, are provided. The first sipes each include a sipe main body portion having a constant distance between sipe wall surfaces on a sipe bottom side and a sipe chamfered portion inclined so that the sipe wall surfaces are open toward the tread surface.Type: ApplicationFiled: June 30, 2022Publication date: October 13, 2022Inventor: Ryouichi Tomomatsu
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Patent number: 11407257Abstract: A tread pattern of a pneumatic tire includes one center continuous land portion and two intermediate continuous land portions that are divided by four circumferential main grooves and that are not provided with lug grooves. Edges on both sides of one center main groove include groove chamfered portions having a chamfered width changing in the circumferential direction in a zigzag shape. In the regions of the intermediate continuous land portions, first sipes extending inward in the lateral direction from shoulder main grooves of the main grooves, which are positioned on outer sides in the lateral direction, are provided. The first sipes each include a sipe main body portion having a constant distance between sipe wall surfaces on a sipe bottom side and a sipe chamfered portion inclined so that the sipe wall surfaces are open toward the tread surface.Type: GrantFiled: August 30, 2018Date of Patent: August 9, 2022Assignee: The Yokohama Rubber Co., LTD.Inventor: Ryouichi Tomomatsu
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Publication number: 20210155053Abstract: In a pneumatic tire, a circumferential main groove having a zigzag shape and extending in a tire circumferential direction in a contact patch of a tread portion, and land portions defined and formed on both sides in a tire width direction of the circumferential main groove, with the circumferential main groove as a boundary, are provided. A contact patch of each of the land portions is formed protruding from a reference profile toward an outer side in a tire radial direction.Type: ApplicationFiled: July 1, 2019Publication date: May 27, 2021Inventor: Ryouichi TOMOMATSU
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Publication number: 20210122195Abstract: Steering stability performance on dry road surfaces and steering stability performance on wet road surfaces are improved. A land portion width Wcc of a center land portion (31) and a land portion width Wco of an outer side middle land portion (32) satisfy a relationship of Wcc<Wco. In addition, a ground contact surface (10) of each of the outer side middle land portion (32) and an outer side shoulder land portion (34) is formed to protrude toward an outer side in a tire radial direction with respect to a reference profile PRco, PRso, and a protruding amount Hco of the outer side middle land portion (32) and a protruding amount Hso of the outer side shoulder land portion (34) satisfy a relationship of Hco<Hso.Type: ApplicationFiled: July 1, 2019Publication date: April 29, 2021Inventor: Ryouichi TOMOMATSU
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Publication number: 20200384810Abstract: A tread pattern of a pneumatic tire includes continuous lands provided in half treads on first and second sides, circumferential main grooves, and sipes having a chamfered configuration. The sipes extend inward in a lateral direction from the circumferential main grooves and are closed in the middle of regions of the continuous lands. An edge shape of each of sipes on the first side includes an extending portion extending inward in the lateral direction constantly in an extension direction and a bent portion that is provided to be joined to an end of the first extending portion and that has the edge shape bent from the extension direction of the first extending portion to a direction close to the circumferential direction. Every portion of the first extending portion and the bent portion of the sipes are provided with a main body portion and a sipe chamfered portion.Type: ApplicationFiled: November 15, 2018Publication date: December 10, 2020Inventor: Ryouichi Tomomatsu
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Publication number: 20200282776Abstract: A tread pattern of a pneumatic tire includes one center continuous land portion and two intermediate continuous land portions that are divided by four circumferential main grooves and that are not provided with lug grooves. Edges on both sides of one center main groove include groove chamfered portions having a chamfered width changing in the circumferential direction in a zigzag shape. In the regions of the intermediate continuous land portions, first sipes extending inward in the lateral direction from shoulder main grooves of the main grooves, which are positioned on outer sides in the lateral direction, are provided. The first sipes each include a sipe main body portion having a constant distance between sipe wall surfaces on a sipe bottom side and a sipe chamfered portion inclined so that the sipe wall surfaces are open toward the tread surface.Type: ApplicationFiled: August 30, 2018Publication date: September 10, 2020Inventor: Ryouichi Tomomatsu