Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5618025 | Protected soft seat with secondary hard seat | Edward J. Merwald | 1997-04-08 |
| 5615708 | Flow control valve with non-plugging multi-stage valve trim | — | 1997-04-01 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5618025 | Protected soft seat with secondary hard seat | Edward J. Merwald | 1997-04-08 |
| 5615708 | Flow control valve with non-plugging multi-stage valve trim | — | 1997-04-01 |