DC

David W. Callahan

IT Independent Technologies: 2 patents #6 of 22Top 30%
📍 Omaha, NE: #654 of 2,015 inventorsTop 35%
🗺 Nebraska: #1,893 of 5,697 inventorsTop 35%
Overall (All Time): #2,303,201 of 4,157,543Top 60%
2
Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
5228072 Multiwire-pair telecommunications test system Daryl Ingalsbe, David L. Ingalsbe, Jeffrey Wilson 1993-07-13
4741016 Special service signal tester — 1988-04-26