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:
Oct. 06, 1981
Filed:
Mar. 08, 1979
Luigi Maiocchi, Milan, IT;
Industrie Pirelli S.p.A., Milan, IT;
Abstract
A pneumatic tire having a radial carcass which is adapted for use on heavy duty motor vehicles such as trucks and buses is provided with an annular reinforcing structure in the crown of the tire between the carcass and the tread band having at least three layers of metal cords with the two layers which are radially inner of the third layer being of cords having an ultimate elongation of about 3% and the cords of the third layer having an ultimate elongation of about 4% to about 8%. The cords of each of the two radially inner layers are substantially parallel to each other and inclined with respect to the direction of travel of the tire but the cords of one of the two layers cross those of the other layer. The cords of the third layer are substantially parallel to each other and to the direction of travel of the tire. The third layer has a central strip astride the center line of the tire and a lateral strip on each side of the center strip which is more resistant to tension and compression stresses than the center strip.