Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5269920 | Cap system for underdrains in gravity filters | Marvin A. Brown | 1993-12-14 |
| 5232592 | Cap for underdrains in gravity filters | Marvin A. Brown, Gerald D. Wolfe | 1993-08-03 |
| 5149427 | Cap for underdrains in gravity filters | Marvin A. Brown, Gerald D. Wolfe | 1992-09-22 |