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. 26, 1978
Filed:
Aug. 30, 1976
Applicant:
Inventor:
John R Burrell, Chalfont, PA (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B29D / ;
U.S. Cl.
CPC ...
425466 ; 264209 ; 425381 ; 425467 ;
Abstract
This invention relates to an improvement in the construction of retreading envelopes and to an extrusion apparatus for producing same. The envelopes commonly used in bonding new treads to tire casings are generally uniform in thickness, and, as a result, no provision is made for those areas of the envelope which receive the greatest stress. By utilizing an envelope of U-shaped cross section and one whose thickness is significantly increased in areas of greatest stress, the prior art impediments are effectively overcome.