Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7067445 | Extended particle size distribution ceramic fracturing proppant | Danny Louis Mickelson, Stephen K. Schubarth, Edwyn M. Snyder, Andrew T. Sheppard | 2006-06-27 |
| 6780804 | Extended particle size distribution ceramic fracturing proppant | Danny Louis Mickelson, Stephen K. Schubarth, Edwyn M. Snyder, Andrew T. Sheppard | 2004-08-24 |
| 5151918 | Electrode blocks and block assemblies | Ronald D. Argent, Richard A. Ruthers | 1992-09-29 |