JH

Jan G. Hellwarth

📍 Dallas, TX: #4,358 of 7,543 inventorsTop 60%
🗺 Texas: #73,555 of 125,132 inventorsTop 60%
Overall (All Time): #3,905,647 of 4,157,543Top 95%
1
Patents All Time

Issued Patents All Time

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
4935956 Automated public phone control for charge and collect billing George A. Hellwarth, James B. Hellwarth, David C. Hellwarth 1990-06-19