WJ

Weldon K. Johnson

KC Kerr-Mcgee Coal: 4 patents #1 of 18Top 6%
Overall (All Time): #1,309,370 of 4,157,543Top 35%
4
Patents All Time

Issued Patents All Time

Patent #TitleCo-InventorsDate
4417840 Particulate material transfer system — 1983-11-29
4396339 Particulate material transfer system — 1983-08-02
4290725 Particulate material transfer system — 1981-09-22
4277215 Articulate material transfer system — 1981-07-07