JR

John K. Roof

📍 Calabasas, CA: #2,243 of 4,119 inventorsTop 55%
🗺 California: #247,236 of 386,348 inventorsTop 65%
Overall (All Time): #4,095,771 of 4,157,543Top 100%
1
Patents All Time

Issued Patents All Time

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
4286495 Musical instrument training device — 1981-09-01