RD

Richard E. Doerr

CC Consolidation Coal: 2 patents #2 of 15Top 15%
📍 Ponca City, OK: #3 of 51 inventorsTop 6%
🗺 Oklahoma: #43 of 749 inventorsTop 6%
Overall (1989): #17,784 of 140,708Top 15%
2
Patents 1989

Issued Patents 1989

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
4817786 Drive arrangement for tramming conveyor Thomas W. McCormick 1989-04-04
4798279 Mine haulage method and apparatus Margaret A. Roberts, Harry J. Brown 1989-01-17