Patterning device for security facsimile systems

Details Patterning device for security facsimile systems Patterning device for security facsimile systems

1989-03-20

1990-01-23

Buczinski, Stephen C.

Cryptography

By modifying optical image

283 17, 283 73, 283902, 355201, 380 18, G03B 2700, H04N 144, G09C 500

Patent

active

048963550

ABSTRACT:
A device for photocopying a document to produce two partial documents for secure transmission. A transparent sheet is placed on the cover glass and has a pattern thereon of portions which are complementary along longitudinally equal shift distances. There is a frame having the transparent sheet attached to the bottom thereof and including parallel side members. A holder is disposed within the frame and on the transparent sheet between the side members for longitudinal sliding a document over the pattern between a first position and a second position located at the equal shift distance. The holder comprises a top member and a transparent carrier member slidably disposed on the transparent sheet and attached to the top member for sliding movement in combination therewith with a document to be photocopied therebetween. The holder is moveable between the first position and the second position. A combined stop and detent prevents the holder from sliding too far and resiliently holds the holder in the positions. The top member includes a gripping tab extending beyond the frame for gripping to move the top member between the positions. Touch fastener material may be employed to releasably attach the gripping tab to a surface of the photocopy machine so that the frame can be moved relative to the top member to prevent document top/bottom margin loss.

REFERENCES:
patent: 2417163 (1947-03-01), Horst
patent: 3718349 (1973-02-01), Small
patent: 3914877 (1975-10-01), Hines
patent: 4586711 (1986-05-01), Winters
patent: 4682954 (1987-07-01), Cook
patent: 4776013 (1988-10-01), Kafri et al.
patent: 4786941 (1988-11-01), Regan

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