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Hartmut Steppan
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Wiesbaden, DE
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last 30 patents
Information
Patent Grant
Photopolymerizable mixture and photopolymerizable copying material...
Patent number
5,217,845
Issue date
Jun 8, 1993
Hoechst Aktiengesellschaft
Hartmut Steppan
C07 - ORGANIC CHEMISTRY
Information
Patent Grant
Quinoline and acridine compounds effective as photoinitiators and c...
Patent number
5,200,299
Issue date
Apr 6, 1993
Hoechst Aktiengesellschaft
Hartmut Steppan
C07 - ORGANIC CHEMISTRY
Information
Patent Grant
1,2-naphthoquinone-2-diazide-sulfonic acid amides and photosensitiv...
Patent number
5,162,190
Issue date
Nov 10, 1992
Hoechst Aktiengesellschaft
Wolfgang Zahn
C07 - ORGANIC CHEMISTRY
Information
Patent Grant
Carbonylmethylene-heterocyclic compounds containing trihalogenometh...
Patent number
4,966,828
Issue date
Oct 30, 1990
Hoechst Aktiengesellschaft
Reinhard Doenges
C07 - ORGANIC CHEMISTRY
Information
Patent Grant
Radiation-polymerizable mixture
Patent number
4,956,264
Issue date
Sep 11, 1990
Hoechst Aktiengesellschaft
Ulrich Geissler
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Process for stripping light-hardened photoresist layers
Patent number
4,776,892
Issue date
Oct 11, 1988
Hoechst Aktiengesellschaft
Hartmut Steppan
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Light-sensitive, diazonium group-containing polycondensation produc...
Patent number
4,661,432
Issue date
Apr 28, 1987
Hoechst Aktiengesellschaft
Walter Lutz
C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information
Patent Grant
Photosensitive mixture and photosensitive recording material with d...
Patent number
4,659,645
Issue date
Apr 21, 1987
Hoechst Aktiengesellschaft
Hans-Dieter Frommeld
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Positive-working radiation-sensitive mixture
Patent number
4,506,003
Issue date
Mar 19, 1985
Hoechst Aktiengesellschaft
Hans Ruckert
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Light-sensitive polycondensation product containing diazonium and d...
Patent number
4,492,748
Issue date
Jan 8, 1985
Walter Lutz
C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information
Patent Grant
Process for the preparation of screen printing stencils by an elect...
Patent number
4,401,520
Issue date
Aug 30, 1983
Hoechst Aktiengesellschaft
Hartmut Steppan
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Photopolymer having 2-pyridone side group
Patent number
4,159,202
Issue date
Jun 26, 1979
Hoechst Aktiengesellschaft
Harald Furrer
C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...