Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6889702 | Replaceable valve seat ring with enhanced flow design | Randy Hall, Ronald Burr | 2005-05-10 |
| 6698449 | Replaceable valve seat ring with enhanced flow design | Randy Hall, Ronald Burr, Mark Stiehl | 2004-03-02 |