Issued Patents 2002
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6491116 | Frac plug with caged ball | Kevin T. Berscheidt, Donald R. Smith, Lee W. Stepp, Gregory W. Vargus | 2002-12-10 |
| 6394180 | Frac plug with caged ball | Kevin T. Berscheidt, Donald R. Smith, Lee W. Stepp, Gregory W. Vargus | 2002-05-28 |