Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7067445 | Extended particle size distribution ceramic fracturing proppant | Roy A. Webber, Danny Louis Mickelson, Stephen K. Schubarth, Andrew T. Sheppard | 2006-06-27 |
| 6780804 | Extended particle size distribution ceramic fracturing proppant | Roy A. Webber, Danny Louis Mickelson, Stephen K. Schubarth, Andrew T. Sheppard | 2004-08-24 |