Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5669733 | Angled adapter for a leaching chamber system | Frank Daly, Douglas O. Hamilton | 1997-09-23 |
| 5556231 | Severable leaching chamber with end cap | Douglas O. Hamilton | 1996-09-17 |
| 4709723 | Septic tank for alternative sewer systems | Donald A. Lytle | 1987-12-01 |
| 4527319 | Method and apparatus for manufacturing foldable conduit | Larry A. Rosenbaum | 1985-07-09 |
| 4296891 | Expandable core for rolls of tubing | Maynard L. Good | 1981-10-27 |