Leonard G. Doerrfeld

📍 Lake in the Hills, IL: #2 of 6 inventorsTop 35%

🗺 Illinois: #802 of 3,813 inventorsTop 25%

Overall (1989): #38,078 of 140,708Top 30%

Patents 1989

Issued Patents 1989

Showing 1–1 of 1 patents

Patent #	Title	Co-Inventors	Date
4796892	Golf training and practice device	—	1989-01-10