Robert Kopenhaver

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Berwyn, PA, US

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Patents Grantslast 30 patents

Information Patent Grant
Method of manufacturing roofing shingles having multiple ply appear...
- Patent number 4,352,837
- Issue date Oct 5, 1982
- Certain-teed Corporation
- Robert L. Kopenhaver
- B44 - DECORATIVE ARTS
Information Patent Grant
Apparatus for manufacturing roofing shingles having multiple ply-ap...
- Patent number 4,295,445
- Issue date Oct 20, 1981
- Certain-teed Corporation
- Robert Kopenhaver
- E04 - BUILDING