DS

Duane L. Sterwald

FS Federal Signal: 2 patents #162 of 717Top 25%
📍 Watertown, WI: #52 of 152 inventorsTop 35%
🗺 Wisconsin: #17,084 of 40,088 inventorsTop 45%
Overall (All Time): #2,332,443 of 4,157,543Top 60%
2
Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
4855576 Thermal insulating blocks and utilizing single blocks for electrical heating units — 1989-08-08
4719336 Method of making thermal insulating blocks and electrical heating units and the products thereof — 1988-01-12