Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4927796 | Compositions for purifying liquids | Philip J. D'Angelo, Richard Hetherington | 1990-05-22 |
| 4853130 | Method for purifying liquids | Philip J. D'Angelo, Richard Hetherington | 1989-08-01 |