Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5308494 | Method for improving filter efficiency | Roy Segars, Jr. | 1994-05-03 |
| 5043069 | Filtration device having hardened gum formed-in-place membranes | Harold G. Spencer | 1991-08-27 |