Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6802379 | Liquid lift method for drilling risers | Yuh-Hwang Tsao, Sandra Hopko | 2004-10-12 |
| 6634430 | Method for installation of evacuated tubular conduits | Mark W. Biegler | 2003-10-21 |
| 6173713 | Eye patch construction method | — | 2001-01-16 |
| 5901795 | Well collision avoidance | Yuh-Hwang Tsao, David W. Ure | 1999-05-11 |
| 4568392 | Well treating fluid | Norman N. Li, Dennis E. O'Brien | 1986-02-04 |
| 4503170 | Shear thickening fluid | Evelyn N. Drake, Mary Elizabeth Morrison | 1985-03-05 |
| 4397354 | Method of using a well treating fluid | Norman N. Li, Dennis E. O'Brien | 1983-08-09 |