Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5234018 | Sewer check valve and cleanout apparatus | Michael R. Andrews, Rodney C. Freligh, Howard L. Griffiths | 1993-08-10 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5234018 | Sewer check valve and cleanout apparatus | Michael R. Andrews, Rodney C. Freligh, Howard L. Griffiths | 1993-08-10 |