SS

Sylvester L. Steffen

📍 New Hampton, IA: #15 of 41 inventorsTop 40%
🗺 Iowa: #4,661 of 15,303 inventorsTop 35%
Overall (All Time): #1,669,583 of 4,157,543Top 45%
3
Patents All Time

Issued Patents All Time

Showing 1–3 of 3 patents

Patent #TitleCo-InventorsDate
4800653 Method and apparatus for controlling the drying and cooling of field-harvested seeds in storage 1989-01-31
4256029 Pressure reducing exhaust method and structure for ventilated grain bins Vincent B. Steffen 1981-03-17
4247989 Method for identifying and maintaining a dormancy index in stored grain 1981-02-03