Richard A. Dortzbach

UN Unknown: 2 patents #12,644 of 83,584Top 20%

🗺 California: #149,087 of 386,348 inventorsTop 40%

Overall (All Time): #1,641,764 of 4,157,543Top 40%

Patents All Time

Issued Patents All Time

Showing 1–3 of 3 patents

Patent #	Title	Co-Inventors	Date
5848931	Chimney top spark arrester and damper	—	1998-12-15
5402830	Thermal pipe guard	—	1995-04-04
4386571	Adjustable spark arrester for fireplace flue	—	1983-06-07