JB

John L. Butler

HA Hazeltine: 1 patents #2 of 6Top 35%
IA Image Acoustics: 1 patents #1 of 1Top 100%
📍 Marshfield, MA: #1 of 5 inventorsTop 20%
🗺 Massachusetts: #114 of 1,827 inventorsTop 7%
Overall (1982): #12,018 of 81,411Top 15%
2
Patents 1982

Issued Patents 1982

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
4332986 Speaker system employing passive radiator 1982-06-01
4326275 Directional transducer 1982-04-20