Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4269707 | Apparatus and method | Donald J. Butterworth, Robert W. Loudon | 1981-05-26 |
| 4238334 | Purification of liquids with treated filter aid material and active particulate material | — | 1980-12-09 |
| 4190532 | Charged filter aid material and ion exchange bed | — | 1980-02-26 |