Clement O. DuFrene

UN Unknown: 4 patents #4,220 of 83,584Top 6%

📍 Cottage Grove, MN: #126 of 362 inventorsTop 35%

🗺 Minnesota: #15,886 of 52,454 inventorsTop 35%

Overall (All Time): #1,305,470 of 4,157,543Top 35%

Patents All Time

Issued Patents All Time

Showing 1–4 of 4 patents

Patent #	Title	Co-Inventors	Date
4653603	Rotary fluid devices	—	1987-03-31
4573892	Rotary fluid device with axially sliding vanes	—	1986-03-04
4539920	Transplanters	—	1985-09-10
4534436	Control valve apparatus and steering systems	—	1985-08-13