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. 10, 1981
Filed:
Sep. 20, 1978
Applicant:
Inventor:
Lennart J Frisk, Helsingborg, SE;
Assignee:
Tretorn Aktiebolag, Helsingborg, SE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
A63B / ; A63B / ;
U.S. Cl.
CPC ...
273 / ; 273 / ; 273D / ;
Abstract
A tennis ball is provided comprising a hollow sphere of natural rubber and/or synthetic rubber similar in resilience properties to natural rubber, said rubber containing a filler, said sphere containing a gas having the same or higher pressure than that of the surrounding atmosphere, said filler comprising chrome-tanned leather particles, all of the dimensions of which being within the range of 0.1-2.50 mm.