C Defective Document D Deleted Document E EuroPCT M Missing Document N Not used publication number W Withdrawn Publication A1 European Patent Application with search report A2 European Patent Application without search report A3 European Patent Application search report A4 European Patent Application supplementary search report A8 European Patent Application correction title page A9 European Patent Application correction complete document B1 European Patent Specification B2 European Patent Specification after opposition procedure B3 European Patent Specification after limitation procedure B8 European Patent Specification correction title page B9 European Patent Specification coorection complete document 3340760 20180627 19781220 20250630 0000001 3340760 19781220 20250630 A1 2349815 A2 990536 A3 647166 A4 568084 A8 3623 A9 2367 B1 1636205 B2 22929 B3 379 B8 12012 B9 5668 C 1 D 473 E 1382956 M 911 N 2742 W 4840 EP 0000001 A1 19871220 EP 78200013 19780601 en fr de fr fr EP 0000001 B1 19810107 EP 78200013 19780601 en fr de en en EP 0000849 P de N N EP 1821590 M en N N