Roy A. Grewell

📍 Port Townsend, WA: #38 of 89 inventorsTop 45%

🗺 Washington: #48,111 of 76,902 inventorsTop 65%

Overall (All Time): #3,949,830 of 4,157,543Top 100%

Patents All Time

Issued Patents All Time

Showing 1–1 of 1 patents

Patent #	Title	Co-Inventors	Date
4736801	Chimney fire extinguisher	—	1988-04-12