Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4456061 | Filters used in well fluid cleaning operations | John B. Echols | 1984-06-26 |
| 4421170 | Method and apparatus for quick replacement of cartridge filters used in well fluid cleaning operations | Philip W. Schmuck | 1983-12-20 |
| 4295525 | Method and apparatus for quick replacement of cartridge filters used in well fluid cleaning operations | Philip W. Schmuck | 1981-10-20 |