Article removal alarm system for use with portable electronic de

Details Article removal alarm system for use with portable electronic de Article removal alarm system for use with portable electronic de

1995-10-13

1997-03-25

Swann, Glen

Communications: electrical

Condition responsive indicating system

Specific condition

340531, 340568, G08B 1316

Patent

active

056148860

ABSTRACT:
An article removal alarm system includes a base unit for generating an ultrasonic signal for transmission in the vicinity of the base unit. A remote unit accompanying an associated article includes a receiver for receiving the ultrasonic signal. A threshold detector provides a threshold signal upon failure of the receiver to receive the ultrasonic signal at predetermined strength. An alarm unit then generates an alarm signal in response to the threshold signal. In a particular implementation the system enables monitoring of the proximity of a stylus or other input utensil to a responsive user interface of an electronic device.

REFERENCES:
patent: 4593273 (1986-06-01), Narcisse
patent: 4870405 (1989-09-01), Fletcher
patent: 5309144 (1994-05-01), Lacombe et al.

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