Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6681792 | Reduced-length sleeve valve | Brad Matejek, Erick Maitre, Eric T. Brewer | 2004-01-27 |
| 4312221 | Hardness tester mounting apparatus | Robert M. Edward, Jr. | 1982-01-26 |
| 4199976 | Hardness testing apparatus | — | 1980-04-29 |