DH

David F. Hemmings

BT Boston Technology: 1 patents #11 of 25Top 45%
📍 Attleboro, MA: #410 of 647 inventorsTop 65%
🗺 Massachusetts: #56,664 of 88,656 inventorsTop 65%
Overall (All Time): #3,812,370 of 4,157,543Top 95%
1
Patents All Time

Issued Patents All Time

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
5369697 Method and apparatus for automatically switching between pulse code and DTMF signals generated by a telephone John P. Murray, III, David S. Gergacz 1994-11-29