The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 02, 2014
Filed:
Dec. 25, 2009
Nicolas Dautrey, Ota, JP;
Nicolas Dautrey, Ota, JP;
Compagnie Generale des Etablissements Michelin, Clermont-Ferrand, FR;
Michelin Recherche et Technique S.A., Granges-Paccot, CH;
Abstract
Pneumatic tire tread which reduces tread pattern noise while suppressing air column resonance from circumferential grooves is provided with a number of sets of resonators and at least two types of branch groove shapes; the length of the first branch grooves at least 40% of the length of the contact surface, and groove width between 10% and 25% of the circumferential groove width; the length of the second branch grooves between 40% and 90% of the length of the first branch grooves, and the groove width no less than the first branch groove width; first openings and second openings alternately present on same circumferential groove; length between openings in first branch grooves is no more than 50% of the length of the contact surface; difference between the minimum cross-sectional void ratio in the ribs where the branch grooves are provided and the maximum cross-sectional void ratio is no greater than 10%.