Thorvald Madland

TD The Youngstown Steel Door: 2 patents #4 of 12Top 35%

📍 Mendota, IL: #19 of 53 inventorsTop 40%

🗺 Illinois: #34,584 of 84,256 inventorsTop 45%

Overall (All Time): #2,362,787 of 4,157,543Top 60%

Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #	Title	Co-Inventors	Date
4390196	Sliding door starter and closer	—	1983-06-28
4344366	Railway car door driver	—	1982-08-17