Cryptography – Electric signal modification – Having production of printed copy
Patent
1990-04-11
1992-06-09
Swann, Tod R.
Cryptography
Electric signal modification
Having production of printed copy
380 3, 36446402, 36491852, 400104, H04K 100
Patent
active
051214326
ABSTRACT:
A franking machine is disclosed in which the accounting and control circuits of the meter are housed in a secure housing and a printing device for printing a franking impression is located exterior to the secure housing and is connected to the accounting and control circuits. Strings of print data sent to the printing device are returned in a succeeding print cycle to a check circuit in the housing to check integrity of the print data received by the printing device. If desired the print data strings may include a security code. In order to detect if the printing device has been disconnected from the meter, the meter includes a circuit to send a pulse train to the printing device via the connection for print data and to receive a pulse train from the printing device. The circuit compares the pulse trains and if the comparison is unsuccessful inhibits further franking operations.
REFERENCES:
patent: 4253158 (1981-02-01), McFiggan
patent: 4335441 (1982-06-01), Baumann et al.
patent: 4813912 (1989-03-01), Chickneus et al.
patent: 4934846 (1990-06-01), Gilham
Gilham Dennis T.
Herbert Raymond J.
Alcatel Business Systems Limited
Swann Tod R.
LandOfFree
Franking machine, with printing device external to secure housin does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Franking machine, with printing device external to secure housin, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Franking machine, with printing device external to secure housin will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1811306