DI

David W. Johns, II

📍 Marion, MA: #33 of 55 inventorsTop 60%
🗺 Massachusetts: #56,664 of 88,656 inventorsTop 65%
Overall (All Time): #3,976,558 of 4,157,543Top 100%
1
Patents All Time

Issued Patents All Time

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
4673363 Marine measurement device Alan T. Hudson, David P. Gagnon, William J. Langenhein, Jr. 1987-06-16