Patents per Year
Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date | Approx Value ⓘ |
|---|---|---|---|---|
| 7131496 | Portable drill string compensator | Richard D. Williams | 2006-11-07 | |
| 7131922 | Ram-type tensioner assembly having integral hydraulic fluid accumulator | Richard D. Williams | 2006-11-07 | |
| 7008340 | Ram-type tensioner assembly having integral hydraulic fluid accumulator | Richard D. Williams | 2006-03-07 | |
| 6968900 | Portable drill string compensator | Richard D. Williams | 2005-11-29 | |
| 4209891 | Apparatus and method for positioning one part relative to another part | Raymond K. Lamb, Richard E. Weathers, Stephen John Walker | 1980-07-01 | $3,627,000 |