Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8028750 | Force balanced rotating pressure control device | William James Hughes, Thomas L. Pettigrew, Kurt D. Vandervort, Kenneth D. Young | 2011-10-04 |
| 7743823 | Force balanced rotating pressure control device | William James Hughes, Thomas L. Pettigrew, Kurt D. Vandervort, Kenneth D. Young | 2010-06-29 |
| 7380590 | Rotating pressure control head | William James Hughes | 2008-06-03 |
| 4459899 | Single acting reciprocating pump piston | — | 1984-07-17 |