Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1998-05-27
1999-06-08
Tong, Nina
Communications: electrical
Condition responsive indicating system
Specific condition
186 62, 2502221, G08B 1314
Patent
active
059107693
ABSTRACT:
A shopping cart scanning system is disclosed comprised of first and second photoelectric devices situated in a check-out counter and respectively located at the entrance and exit portion of a scanning field. The photoelectric devices both operate in a retro-reflective mode and operatively cooperate with a reflective strip that is attached to the shopping cart. The photoelectric device, and their associated circuits, are arranged to detect the presence or absence of packages in the lower tray of the shopping cart as the shopping cart moves through a check-out counter.
REFERENCES:
patent: 3725894 (1973-04-01), Geisler
patent: 4338594 (1982-07-01), Holm
patent: 5485006 (1996-01-01), Allen et al.
patent: 5500526 (1996-03-01), Shalvi et al.
patent: 5610584 (1997-03-01), Schrade
Tong Nina
Wobensmith, III Zachary T.
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