Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5232592 | Cap for underdrains in gravity filters | Marvin A. Brown, Richard P. Beverly | 1993-08-03 |
| 5149427 | Cap for underdrains in gravity filters | Marvin A. Brown, Richard P. Beverly | 1992-09-22 |
| 5108627 | Filter underdrain block | Dean T. Berkebile | 1992-04-28 |
| 4268394 | Beach for the scum trough of a sewage settling tank or the like | — | 1981-05-19 |