Gregory G. Hollenkemp

AO Ashland Oil: 2 patents #103 of 284Top 40%

📍 Windom, MN: #1,276 of 2,819 inventorsTop 50%

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

Overall (All Time): #2,313,634 of 4,157,543Top 60%

Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #	Title	Co-Inventors	Date
D319265	Combined barrel sign and support member therefor	Joel M. Anderson	1991-08-20
D313630	Barrel sign	Joel M. Anderson	1991-01-08