PR

Philip C. Rolffs

📍 Portage, MI: #3 of 26 inventorsTop 15%
🗺 Michigan: #263 of 3,452 inventorsTop 8%
Overall (1989): #18,288 of 140,708Top 15%
2
Patents 1989

Issued Patents 1989

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
4840637 Synthetic ebony and method of producing the same (I) — 1989-06-20
4840638 Synthetic ebony and method of producing the same (II) — 1989-06-20