EP 0156463 B1 19870616 - PROTECTION OF LEGAL DOCUMENTS BY REVERSE PENETRATION
Title (en)
PROTECTION OF LEGAL DOCUMENTS BY REVERSE PENETRATION
Publication
Application
Priority
US 57793684 A 19840207
Abstract (en)
[origin: EP0156463A1] A document has a paper substrate witb a front surface upon which information is marked in ink. The document is improved to resist alterations by erasure of selected information on its front surface. In the improvement the substrate has a back surface upon which the selected information is marked in ink in identical underlay position as the selected information on the front surface. Ink penetrates into the front and back surfaces of the substrate to such an extent in the identical underlay positions tbat the selected information on the front face may not be erased without damage to the substrate to expose ink penetration from the back surface.
IPC 1-7
IPC 8 full level
B41M 3/14 (2006.01); B42D 15/00 (2006.01); B44F 1/12 (2006.01); D21H 21/40 (2006.01)
CPC (source: EP)
B41M 3/14 (2013.01); B42D 25/29 (2014.10); D21H 21/40 (2013.01)
Designated contracting state (EPC)
BE DE FR GB NL SE
DOCDB simple family (publication)
EP 0156463 A1 19851002; EP 0156463 B1 19870616; CA 1232303 A 19880202; DE 3560251 D1 19870723
DOCDB simple family (application)
EP 85300693 A 19850201; CA 473590 A 19850205; DE 3560251 T 19850201