DC

Donald R. Calvin

📍 Leadville, CO: #3 of 12 inventorsTop 25%
🗺 Colorado: #13,156 of 40,980 inventorsTop 35%
Overall (All Time): #1,622,396 of 4,157,543Top 40%
3
Patents All Time

Issued Patents All Time

Showing 1–3 of 3 patents

Patent #TitleCo-InventorsDate
6325297 Atmospheric liquid heater Thomas B. Calvin 2001-12-04
6227453 Atmospheric liquid heater Thomas B. Calvin 2001-05-08
6126081 Atmospheric liquid heater Thomas B. Calvin 2000-10-03