Issued Patents 1982
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4358370 | Backwashable filter | David O. Richards | 1982-11-09 |
| 4358371 | Backwashable filter | David O. Richards | 1982-11-09 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4358370 | Backwashable filter | David O. Richards | 1982-11-09 |
| 4358371 | Backwashable filter | David O. Richards | 1982-11-09 |