Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6709065 | Rotary cutting bit with material-deflecting ledge | Kent Peay | 2004-03-23 |
| 5993116 | Filler-containing rock bolt anchoring system and method of preparation thereof | Ronald L. Paxton, Joseph C. Zelanko | 1999-11-30 |
| 5934990 | Mine stopping | John Steffenino, C. Dempsey Holstein, Joseph C. Zelanko | 1999-08-10 |
| 5436396 | Stabilizing compositions and methods for stabilizing subterranean formations | Philip E. Bailey, Raymond R. Chervenak | 1995-07-25 |
| 5043019 | Sealant for concrete or cinder block walls | Raymond R. Chervenak, C. Dempsey Holstein | 1991-08-27 |