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:
Jun. 07, 1977
Filed:
Jan. 09, 1976
Frederick B Hadtke, New Providence, NJ (US);
Idex Corporation, Scotch Plains, NJ (US);
Abstract
A captive ball device or apparatus for practice purposes in sports, particularly the various forms of tennis, comprising: a captive ball; relatively inelastic, high strength, high hardness, medium or average cut-growth rate cords attached to the captive ball; and relatively elastic, lower strength, low hardness, high cut-growth rate cords, the ends of which are attached to the ends of the relatively inelastic, high strength cords, the other ends of the relatively elastic, lower strength cords being adapted to be secured to poles or other vertical supports at a predetermined, yet variable, height above the ground or floor and at a predetermined, yet variable, distance from the captive ball. Alternatively, the relatively inelastic, high strength cords and the relatively elastic, lower strength cords may be replaced by extremely high elastic, very high strength, average or medium hardness, low cut-growth rate cords which extend from one pole or vertical support to the captive ball and then from the captive ball to the other pole or other vertical support.