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:
Sep. 23, 1980
Filed:
Aug. 28, 1978
Norio Iwata, Kodaira, JP;
Hiroshi Kojima, Hino, JP;
Bridgestone Tire Company, Limited, Tokyo, JP;
Abstract
A pneumatic tire for heavy duty vehicles comprises a tread divided by two circumferential zigzag grooves in a tread center zone including block patterns of elongated blocks circumferentially discontinuous with traverse grooves and side zones including circumferentially continuous ribs. The traverse grooves are provided in their mid portions 30-70% of their lengths with platforms making the grooves shallower 30-70% than their original depths. The pattern of the tread converts into a pattern of ribs formed by the circumferential zigzag grooves having branch grooves when the tread has worn more than 30-70%. The tire including the above tread pattern according to the invention is suitable for both use on paved hard roads and weak grounds.