Rolf W. J. Campbell

LO Land O'Lakes: 2 patents #27 of 82Top 35%

📍 Minneapolis, MN: #2,566 of 6,114 inventorsTop 45%

🗺 Minnesota: #23,881 of 52,454 inventorsTop 50%

Overall (All Time): #2,309,141 of 4,157,543Top 60%

Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #	Title	Co-Inventors	Date
5111932	Spreadable material package with spreader	—	1992-05-12
4648506	Package with spreader for spreadable material	—	1987-03-10