Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4778150 | Non-rotating stem valve | Stephen G. Ratkowski, Donald J. Kalivoda | 1988-10-18 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4778150 | Non-rotating stem valve | Stephen G. Ratkowski, Donald J. Kalivoda | 1988-10-18 |