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Erwin Hoffmann
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Leverkusen, DE
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last 30 patents
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Patent Grant
Process for the preparation of polyurethane foams
Patent number
4,931,480
Issue date
Jun 5, 1990
Bayer Aktiengesellschaft
Kurt Krippl
C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information
Patent Grant
Apparatus for applying a foam-forming flowable reaction mixture to...
Patent number
4,846,099
Issue date
Jul 11, 1989
Bayer Aktiengesellschaft
Kurt Krippl
B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information
Patent Grant
Process and laminator for the continuous production of laminates of...
Patent number
4,804,425
Issue date
Feb 14, 1989
Bayer Aktiengesellschaft
Erwin Hoffmann
B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information
Patent Grant
Equipment for the continuous production of foam boards
Patent number
4,270,889
Issue date
Jun 2, 1981
Bayer Aktiengesellschaft
Erwin Hoffmann
B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information
Patent Grant
Equipment for the continuous production of foam boards
Patent number
4,264,291
Issue date
Apr 28, 1981
Bayer Aktiengesellschaft
Erwin Hoffmann
B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information
Patent Grant
Equipment for the continuous production of foam boards
Patent number
4,255,105
Issue date
Mar 10, 1981
Bayer Aktiengesellschaft
Erwin Hoffmann
B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL