CS

Charles W. Spengler

📍 Hoffman Estates, IL: #8 of 55 inventorsTop 15%
🗺 Illinois: #421 of 4,656 inventorsTop 10%
Overall (1997): #43,806 of 185,788Top 25%
2
Patents 1997

Issued Patents 1997

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
5688297 Portable clean air facility 1997-11-18
5645480 Clean air facility 1997-07-08