DC

David Landis Campbell

📍 Harleysville, PA: #9 of 51 inventorsTop 20%
🗺 Pennsylvania: #1,174 of 7,891 inventorsTop 15%
Overall (2019): #181,565 of 560,194Top 35%
2
Patents 2019

Issued Patents 2019

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
10315850 Proppant conveyor systems and methods of use Shane Campbell, Brent Arcand 2019-06-11
10252090 Heat sensitive protective barrier and a method for its use 2019-04-09