Issued Patents 1994
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5364064 | Safety sub with asymmetrical wall elastomeric closure for retaining drilling fluids | Stephen P. Simons | 1994-11-15 |
| 5339864 | Safety sub for retaining drilling fluids | William L. Carbaugh | 1994-08-23 |
| 5294253 | Carbon black system and improved rubber stock | William David Breach | 1994-03-15 |