DW

David T. Willis

📍 North Reading, MA: #146 of 228 inventorsTop 65%
🗺 Massachusetts: #56,664 of 88,656 inventorsTop 65%
Overall (All Time): #3,844,210 of 4,157,543Top 95%
1
Patents All Time

Issued Patents All Time

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
5089806 Barrier and alarm for blocking a passageway Donald Farnsworth 1992-02-18