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Helmut Protzer
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Osnabruck, DE
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last 30 patents
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Patent Grant
Method for producing brochantite patina on copper
Patent number
5,714,052
Issue date
Feb 3, 1998
KM Europa Metal Aktiengesellschaft
Stefan Hoveling
C25 - ELECTROLYTIC OR ELECTROPHORETIC PROCESSES APPARATUS THEREFOR
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Patent Grant
Process for producing brown covering layers on copper
Patent number
5,282,890
Issue date
Feb 1, 1994
KM-kabelmetal AG
Helmut Protzer
C23 - COATING METALLIC MATERIAL COATING MATERIAL WITH METALLIC MATERIAL CHEMI...