DS

Donald Siefkes

📍 Troy, MI: #1,180 of 2,712 inventorsTop 45%
🗺 Michigan: #35,034 of 86,293 inventorsTop 45%
Overall (All Time): #2,296,148 of 4,157,543Top 60%
2
Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
5335639 Heat exchanger having close packed spheres — 1994-08-09
5231968 Foamed metal heat device — 1993-08-03