DH

David J. Helffrich

BH Bell And Howell: 2 patents #76 of 293Top 30%
BP Bell & Howell Phillipsburg: 1 patents #26 of 45Top 60%
📍 Nazareth, PA: #94 of 277 inventorsTop 35%
🗺 Pennsylvania: #23,606 of 74,527 inventorsTop 35%
Overall (All Time): #1,654,762 of 4,157,543Top 40%
3
Patents All Time

Issued Patents All Time

Showing 1–3 of 3 patents

Patent #TitleCo-InventorsDate
5321624 Insertion machine having multiple document detector Randy Trach 1994-06-14
4959795 Insertion machine with distributed chargeback Dean Everett Christensen, Christopher K. Scullion, Edward W. Hindle 1990-09-25
4479050 Sensor alignment circuit and method of operation 1984-10-23