| 6312637 |
Method of making a rod guide with both high erodible wear volume and by-pass area |
Thomas E. Evans, Randall Ray |
2001-11-06 |
| 6065537 |
Rod guide with both high erodible wear volume and by-pass area |
Thomas E. Evans, Randall Ray |
2000-05-23 |
| 5873157 |
Field installable rod guide and method |
Charles M. Hart, John L. Tillman, Jr., Lindell R. Trout, Stephen L. Witte, Sr. |
1999-02-23 |
| 5755284 |
Extended wear rod guide and method |
Charles M. Hart, Randall Ray, Stephen L. Witte, Sr. |
1998-05-26 |
| 5711533 |
Oilfield stuffing box with polished rod alignment |
Lawrence F. Angelo |
1998-01-27 |
| 5339896 |
Field installable rod guide and method |
Charles M. Hart, John L. Tillman, Jr., Lindell R. Trout, Stephen L. Witte, Sr. |
1994-08-23 |
| 5277254 |
Helical rod guide |
Paul B. Rullman, Edward L. Olinger |
1994-01-11 |
| 5028079 |
Non-crushing wellhead |
L. Dean Smith |
1991-07-02 |
| 4560176 |
Inverted cone stuffing box |
— |
1985-12-24 |