DR

Donald L. Roelfs

UG United States Gypsum: 1 patents #30 of 75Top 40%
📍 West Burlington, IA: #3 of 7 inventorsTop 45%
🗺 Iowa: #361 of 1,342 inventorsTop 30%
Overall (2011): #312,991 of 364,097Top 90%
1
Patents 2011

Issued Patents 2011

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
8070895 Water resistant cementitious article and method for preparing same Dick C. Engbrecht, Qingxia Liu, Michael P. Shake, Xuming Wang, David Paul Miller +3 more 2011-12-06