DL

Douglas D. Ludwig

DI Dart Industries: 2 patents #156 of 354Top 45%
📍 West Bend, WI: #173 of 449 inventorsTop 40%
🗺 Wisconsin: #17,084 of 40,088 inventorsTop 45%
Overall (All Time): #2,371,991 of 4,157,543Top 60%
2
Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
D261348 Ribbed coffee urn lid Leo A. Groh, David L. Painter, John H. Free 1981-10-20
D261215 Coffee urn lid Leo A. Groh, David L. Painter, John H. Free 1981-10-13