Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5738717 | Coloring pigment and method of manufacture | Disederius Erasmus | 1998-04-14 |
| 4498817 | Roof bolts for mines and the like workings | — | 1985-02-12 |
| 4214532 | Stemming | — | 1980-07-29 |