DR

Donley D. Rowenhorst

3M: 5 patents #2,937 of 11,543Top 30%
MM Minnesota Minning & Manufacturing: 1 patents #2 of 23Top 9%
Overall (All Time): #886,947 of 4,157,543Top 25%
6
Patents All Time

Issued Patents All Time

Patent #TitleCo-InventorsDate
5984988 Shaped abrasive particles and method of making same Todd A. Berg, James G. Berg, William K. Leonard 1999-11-16
RE35570 Abrasive article containing shaped abrasive particles Todd A. Berg, David E. Broberg, James G. Berg 1997-07-29
5366523 Abrasive article containing shaped abrasive particles Todd A. Berg 1994-11-22
5304331 Method and apparatus for extruding bingham plastic-type materials William K. Leonard, Jerald A. Scherger, Donald R. Winberg 1994-04-19
5201916 Shaped abrasive particles and method of making same Todd A. Berg, James G. Berg, William K. Leonard 1993-04-13
4505720 Granular silicon carbide abrasive grain coated with refractory material, method of making the same and articles made therewith Thomas Gabor, David E. Broberg, Gunther H. Dierssen 1985-03-19