Inventor

MAY STEFAN

DE5 patents

⚠️ This page may combine multiple inventors who share the name “MAY STEFAN”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

GAO GES AUTOMATION ORG

3 patents

US4557596ADec 10, 1985

Method of screening half-tone picture themes

GAO GES AUTOMATION ORG51 citations95

US4513992AApr 30, 1985

Data carrier having a picture theme superimposed by a line pattern and a method of producing same

GAO GES AUTOMATION ORG16 citations81

US4459020AJul 10, 1984

Data carrier having a picture theme superimposed by a line pattern and a method of producing same

GAO GES AUTOMATION ORG15 citations72

GIESECKE & DEVRIENT GMBH

1 patent

US6357800B1Mar 19, 2002

Document with a moire-generating raster structure

GIESECKE & DEVRIENT GMBH16 citations82

GAO GESSELSCHAFT FUR AUTOMATIO

1 patent

US4659113AApr 21, 1987

Method of screening half-tone picture themes

GAO GESSELSCHAFT FUR AUTOMATIO23 citations78