Validity signal apparatus for monitoring a line boundary

Details Validity signal apparatus for monitoring a line boundary Validity signal apparatus for monitoring a line boundary

1982-09-29

1985-07-09

Groody, James J.

Communications: electrical

Systems

Game reporting

273 29R, 273411, G08B 2300

Patent

active

045285489

ABSTRACT:
Apparatus for determining the validity of a kill shot in racketball or handball, or the like, or of an "out" ball in tennis includes light beam arrays and the interruption of one or more light beams and the timing involved in the interruption is used to provide an appropriate signal.

REFERENCES:
patent: 2113899 (1938-04-01), Oram
patent: 2473893 (1949-06-01), Lyle
patent: 2653309 (1953-09-01), Hausz
patent: 3810148 (1974-05-01), Karsten
patent: 3982759 (1976-09-01), Grant
patent: 4004805 (1977-01-01), Chen
patent: 4224608 (1980-09-01), Lederer
patent: 4432058 (1984-02-01), Supran

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