EP 0056157 B1 19850529 - USE OF 7-HYDROXY-COUMARIN COMPOUNDS FOR IMPREGNATING PAPER
Title (en)
USE OF 7-HYDROXY-COUMARIN COMPOUNDS FOR IMPREGNATING PAPER
Publication
Application
Priority
DE 3100295 A 19810108
Abstract (en)
[origin: US4411946A] 7-Hydroxy-coumarin compounds of the general formula <IMAGE> wherein A represents a heterocyclic radical, which can contain non-ionic substituents customary in dye-stuff chemistry, R represents hydrogen or cyano and Z represents oxygen or NH and the ring B can be further substituted non-ionically, are used for impregnating paper, in particular paper which has to be made forgery-proof.
IPC 1-7
IPC 8 full level
B44F 1/12 (2006.01); D21H 21/28 (2006.01); D21H 21/30 (2006.01); D21H 21/46 (2006.01)
CPC (source: EP US)
D21H 21/28 (2013.01 - EP US); D21H 21/30 (2013.01 - EP US); D21H 21/46 (2013.01 - EP US); Y10S 428/915 (2013.01 - EP US); Y10S 428/916 (2013.01 - EP US)
Designated contracting state (EPC)
CH DE FR GB LI
DOCDB simple family (publication)
EP 0056157 A1 19820721; EP 0056157 B1 19850529; DE 3100295 A1 19820805; DE 3170783 D1 19850704; US 4411946 A 19831025
DOCDB simple family (application)
EP 81110811 A 19811229; DE 3100295 A 19810108; DE 3170783 T 19811229; US 33351781 A 19811222