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:
Feb. 11, 2003
Filed:
Oct. 27, 2000
Pirelli Pneumatici S.p.A., Milan, IT;
Abstract
A low rolling resistance tire ( ) for vehicles is described which comprises at least one belt layer ( ) coaxially extending around at least one carcass ply ( ), a composite tread ( ) coaxially extending around the belt layer ( ) and comprising a radially outer layer ( ) and a radially inner layer ( ), wherein the ratio between the modulus of elasticity E' at 70° C. of the radially inner layer ( ) and the modulus of elasticity E' at 70° C. of the radially outer layer ( ) is comprised between 1.1 and 3, and the ratio between the value of tang&dgr; at 70° C of the radially inner layer ( ) and the value of tang&dgr; at 70° C. of the radially outer layer ( ) is lower than 0.8. Advantageously, the tire ( ) achieves a better compromise between the characteristics of rolling resistance, handling and comfort with respect to what is obtainable from known tires for the same type of use.