Duane W. Humphrey

📍 Wilmington, DE: #2,050 of 3,182 inventorsTop 65%

🗺 Delaware: #4,431 of 7,163 inventorsTop 65%

Overall (All Time): #3,921,140 of 4,157,543Top 95%

Patents All Time

Issued Patents All Time

Showing 1–1 of 1 patents

Patent #	Title	Co-Inventors	Date
4805571	Internal combustion engine	—	1989-02-21