Arbitration of tennis by change of colors

Details Arbitration of tennis by change of colors Arbitration of tennis by change of colors

1983-03-07

1985-09-03

Pinkham, Richard C.

Amusement devices: games

Aerial projectile game; game element or accessory therefor...

Target

A63C 1906

Patent

active

045388113

ABSTRACT:
Disclosed herein is apparatus to precisely determine if a tennis ball hits in or out of the tennis court area. A pressure sensitive layered material which changes colors upon the tennis ball striking it is placed outside the tennis court bounderies and gives an indication whenever the ball strikes out of bounds. The material returns to its original color a short time later.

REFERENCES:
patent: 4011665 (1977-03-01), Port
patent: 4133536 (1979-01-01), Cole
patent: 4212468 (1980-07-01), Knott
patent: 4288936 (1981-09-01), Okutsu
patent: 4354845 (1983-01-01), Poteet et al.

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