Inventor

GRETHEN HARTMUT

DE5 patents

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

SIEMENS AG

2 patents

US4743410AMay 10, 1988

Method for manufacturing a flat illumination unit

SIEMENS AG21 citations75

US4778989AOct 18, 1988

Scanning device for microline-by-microline illumination and optically scanning a planar original

SIEMENS AG12 citations65

MANNESMANN AG

2 patents

US5365348ANov 15, 1994

Process for printing a halftone image

MANNESMANN AG10 citations67

US5158929AOct 27, 1992

Inking ribbon

MANNESMANN AG2 citations58

DREES FRIEDRICH WILHELM

1 patent

US4756633AJul 12, 1988

Inking ribbon including a sublimable release layer for color transfer under the influence of heat

DREES FRIEDRICH WILHELM7 citations62