Issued Patents 2002
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6467812 | Pipe having replaceable wear resistant lined coupler | Gary D. Lehnhardt | 2002-10-22 |
| 6375228 | Coupling units connecting tubular members having a hardened inner wall for carrying mechanically abrasive fluid concrete | Gary D. Lehnhardt | 2002-04-23 |