Stefan Birkenheuer

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Shanghai, CN

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Patents Grantslast 30 patents

Information Patent Grant
Method for treating metallic surfaces with an acidic aqueous compos...
- Patent number 12,049,571
- Issue date Jul 30, 2024
- SPECIALTY OPERATIONS FRANCE
- Stefan Birkenheuer
- C23 - COATING METALLIC MATERIAL COATING MATERIAL WITH METALLIC MATERIAL CHEMI...
Information Patent Grant
Method for treating metallic surfaces with an acidic aqueous compos...
- Patent number 12,043,758
- Issue date Jul 23, 2024
- SPECIALTY OPERATIONS FRANCE
- Stefan Birkenheuer
- C23 - COATING METALLIC MATERIAL COATING MATERIAL WITH METALLIC MATERIAL CHEMI...

Patents Applicationslast 30 patents

Information Patent Application
METHOD FOR TREATING METALLIC SURFACES WITH AN ACIDIC AQUEOUS COMPOS...
- Publication number 20210269654
- Publication date Sep 2, 2021
- CHEMETALL GMBH
- Stefan Birkenheuer
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Application
METHOD FOR TREATING METALLIC SURFACES WITH AN ACIDIC AQUEOUS COMPOS...
- Publication number 20210163757
- Publication date Jun 3, 2021
- CHEMETALL GMBH
- Stefan Birkenheuer
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...