Robert J. Koopman

📍 Auburndale, WI: #3 of 6 inventorsTop 50%

🗺 Wisconsin: #23,834 of 40,088 inventorsTop 60%

Overall (All Time): #4,120,655 of 4,157,543Top 100%

Patents All Time

Issued Patents All Time

Showing 1–1 of 1 patents

Patent #	Title	Co-Inventors	Date
4225149	Remotely operable trailer hitch	—	1980-09-30