David Allan Hultman

UM University of Minnesota: 1 patents #1,216 of 2,951Top 45%

📍 Cambridge, MN: #24 of 55 inventorsTop 45%

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

Overall (All Time): #3,725,486 of 4,157,543Top 90%

Patents All Time

Issued Patents All Time

Showing 1–1 of 1 patents

Patent #	Title	Co-Inventors	Date
5670711	Portable rock strength evaluation device	Emmanuel Detournay, Andrew Drescher	1997-09-23