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. 22, 1981
Filed:
Nov. 16, 1979
Robert C Haines, Huddersfield, GB;
John G Schofield, Barnsley, GB;
Dunlop Limited, , GB;
Abstract
A core for a tennis-ball, the tennis-ball having either an internal pressure substantially equal to atmospheric pressure (a 'pressureless' ball) or an internal pressure of up to 7 p.s.i. (0.49 Kg.cm.sup.-2) above atmospheric pressure (a 'low-pressure' ball), in which the core is made from a rubber composition wherein up to 60% by weight of the total polymer content comprises either a copolymer of ethylene and propylene (an EPM elastomer) or a terpolymer of ethylene, propylene and up to 12% by weight of a non-conjugated diene monomer (an EPDM elastomer). The most suitable EPM and EPDM elastomers are those containing 70 mole percent or more ethylene.