Issued Patents 2004
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6715961 | Method of supporting mine walls and installing a mine stopping | John M. Kennedy | 2004-04-06 |
| 6688813 | Mine stopping and method of installing same | John M. Kennedy | 2004-02-10 |
| 6682263 | Multiple tier stopping and method of constructing stopping | John M. Kennedy | 2004-01-27 |