Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4886710 | Mining/construction tool bit having bit body fabricated from Mn-B steel alloy composition | — | 1989-12-12 |
| 4859543 | Earth working tool having a working element fabricated from cemented tungsten carbide compositions with enhanced properties | Edward V. Conley | 1989-08-22 |
| 4817743 | Butterfly-type shim having semi-opened bottom and double sandwich braze joint produced therewith | Stephen P. Stiffler, Raymond D. Evans | 1989-04-04 |