RK

Robert L. Kopenhaver

CE Certainteed: 2 patents #182 of 431Top 45%
📍 Berwyn, PA: #107 of 235 inventorsTop 50%
🗺 Pennsylvania: #30,495 of 74,527 inventorsTop 45%
Overall (All Time): #2,368,108 of 4,157,543Top 60%
2
Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
4352837 Method of manufacturing roofing shingles having multiple ply appearance — 1982-10-05
4295445 Apparatus for manufacturing roofing shingles having multiple ply-appearance — 1981-10-20