05420606 is referenced by 313 patents and cites 11 patents.

An electronic paperless couponing system in which a store provides shoppers with an electronic communications device having a display screen for display of a graphic of a redemption coupon that represents a discount for an item in the store available for purchase. The communication device has a selection button to enter the selection of the coupon indicating the user's desire to redeem the coupon and a memory to record the selection until the shopper reaches the checkout counter and deducted from the purchases when it is determined that the item subject to the discount has been purchased.

Title
Instant electronic coupon verification system
Application Number
8/123192
Publication Number
5420606
Application Date
September 20, 1993
Publication Date
May 30, 1995
Inventor
Mark A Geiger
871 Canyon Ridge Way #31, Midvale, 84047
UT, US
Paul G Begum
2608 Nottingham Way, Salt Lake City, 84108
UT, US
Agent
Bielen Peterson & Lampe
IPC
G09G 3/02
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