Herbert C. Roehrs

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Beaverton, MI, US

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Patents Grantslast 30 patents

Information Patent Grant
Method and apparatus for producing multilayer plastic articles
- Patent number 5,628,950
- Issue date May 13, 1997
- The Dow Chemical Company
- Walter J. Schrenk
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Method for producing blow molded multilayer plastic articles
- Patent number 5,540,878
- Issue date Jul 30, 1996
- The Dow Chemical Company
- Walter J. Schrenk
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Method and apparatus for producing multilayer plastic articles
- Patent number 5,380,479
- Issue date Jan 10, 1995
- The Dow Chemical Company
- Walter J. Schrenk
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Method for producing injection molded multilayer articles
- Patent number 5,202,074
- Issue date Apr 13, 1993
- The Dow Chemical Company
- Walter J. Schrenk
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL