System for confirming hit locations on tennis court boundaries

Games using tangible projectile – Playing field or court game; game element or accessory... – Having at least two different types of game elements used in...

Reexamination Certificate

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C473S606000, C473S490000

Reexamination Certificate

active

07632197

ABSTRACT:
The present invention is an article and process for determining the site of impact of a movable object on a treated surface, where a tennis ball is treated with a striking composition, and a boundary line region is treated with a receiving composition such that when the striking composition and the receiving composition are in physical contact, a calorimetric indicator is left on the receiving composition to indicate the point of contact.

REFERENCES:
patent: 2735780 (1956-02-01), Compte et al.
patent: RE32842 (1989-01-01), Wigoda
patent: 5242830 (1993-09-01), Argy et al.
patent: 5394824 (1995-03-01), Johnson, Jr.
patent: 6941818 (2005-09-01), Rakowski
patent: 7241237 (2007-07-01), Iggulden
patent: 2006/0287140 (2006-12-01), Brandt et al.

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