Resilient tires and wheels – Tires – resilient – Anti-skid devices
Reexamination Certificate
2011-08-30
2011-08-30
Maki, Steven D (Department: 1747)
Resilient tires and wheels
Tires, resilient
Anti-skid devices
C152S209210, C152S209240, C152SDIG010, C152SDIG020, C152S901000
Reexamination Certificate
active
08006730
ABSTRACT:
A pneumatic tire of the invention includes: a stepped-shaped raised area provided in the main groove positioned at a center area of the tire so as to be continued circumferentially of the tire, connected to either the main groove walls, and raised from the groove bottom; and a ridge lower than a tread surface of the tire in each of the main grooves on both outsides of the main groove at the center area of the tire so as to be raised from the center of the groove bottom continuously along the length thereof without being joined with the groove walls, and the angle of inclination of the main groove walls with respect to the normal line of the tangential line on the tread surface of the main groove portion is parallel to each other or is 5° or smaller.
REFERENCES:
patent: 5535798 (1996-07-01), Nakamura
patent: 6196288 (2001-03-01), Radulescu et al.
patent: 2018565 (1990-12-01), None
patent: 01-215603 (1989-08-01), None
patent: 02-212203 (1990-08-01), None
patent: 06-048123 (1994-02-01), None
patent: 2000-185525 (2000-07-01), None
patent: 2001-055013 (2001-02-01), None
Machine translation for Japan 06-048123 (no date).
Fish & Richardson P.C.
Maki Steven D
Toyo Tire & Rubber Co., Ltd.
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