Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7991554 | Method for predicting rate of penetration using bit-specific coefficients of sliding friction and mechanical efficiency as a function of confined compressive strength | Hector Ulpiano Caicedo, Russell Thomas Ewy | 2011-08-02 |
| 7555414 | Method for estimating confined compressive strength for rock formations utilizing skempton theory | Russell Thomas Ewy | 2009-06-30 |
| 7412331 | Method for predicting rate of penetration using bit-specific coefficient of sliding friction and mechanical efficiency as a function of confined compressive strength | Hector Ulpiano Caicedo, Russell Thomas Ewy | 2008-08-12 |
| 5144763 | Stand for displaying computer keyboard function key guides | — | 1992-09-08 |