04757537 is referenced by 181 patents and cites 12 patents.

A system for detecting fraudulent imprints on documents is disclosed. The system comprises a metering device, a host and a verifying facility. The metering device provides a validation signal to the host and its associated printer. Thereafter, the printer prints information which includes information from the validation signal. Thereafter the information printed on a mailpiece can be validated at the verifying facility by detecting the validation information provided by the metering device. The system provides a method to make a secure metering device without an integral printer. This value printing system provides for a secure system that will allow for the detection of fraudulent imprints at a veryfying facility.

Title
System for detecting unaccounted for printing in a value printing system
Application Number
6/724372
Publication Number
4757537
Application Date
April 17, 1985
Publication Date
July 12, 1988
Inventor
Arno Muller
Westport
CT, US
George B Edelmann
Wilton
CT, US
Agent
Melvin J Scolnick
David E Pitchenik
Donald P Walker
Assignee
Pitney Bowes
CT, US
IPC
H04L 9/00
View Original Source