by Shirley A. Harold, legal representative

DC Donaldson Company: 1 patents #454 of 695Top 70%

📍 Prior Lake, MN: #286 of 425 inventorsTop 70%

🗺 Minnesota: #32,449 of 52,454 inventorsTop 65%

Overall (All Time): #3,657,283 of 4,157,543Top 90%

Patents All Time

Issued Patents All Time

Showing 1–1 of 1 patents

Patent #	Title	Co-Inventors	Date
5938804	Reverse flow air filter arrangement and method	Donald F. Engel, Dolan Bartels, John R. Hacker, Bruce Crenshaw, Don Harold	1999-08-17