Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7048066 | Downhole sealing tools and method of use | Paul D. Ringgenberg, Lee W. Stepp, Donald R. Smith, Ronald L. Hinkie, Don S. Folds | 2006-05-23 |
| 6966386 | Downhole sealing tools and method of use | Paul D. Ringgenberg, Lee W. Stepp, Donald R. Smith, Ronald L. Hinkie, Don S. Folds | 2005-11-22 |
| 6896061 | Multiple zones frac tool | Iosif Hriscu, Don S. Folds, Thomas W. Hawkins, John T. Brandell | 2005-05-24 |
| 6491116 | Frac plug with caged ball | Kevin T. Berscheidt, Donald R. Smith, Lee W. Stepp, Don S. Folds | 2002-12-10 |
| 6394180 | Frac plug with caged ball | Kevin T. Berscheidt, Donald R. Smith, Lee W. Stepp, Don S. Folds | 2002-05-28 |
| 6220349 | Low pressure, high temperature composite bridge plug | Donald F. Hushbeck, Kevin T. Berscheidt, Donny Winslow, Donald R. Smith, Thomas W. Hawkins | 2001-04-24 |