Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE34758 | Travelling disc valve apparatus | David L. Farley | 1994-10-18 |
| 5205361 | Up and down travelling disc valve assembly apparatus | David L. Farley | 1993-04-27 |
| 5137088 | Travelling disc valve apparatus | David L. Farley | 1992-08-11 |