Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5341539 | Apparatus for cleaning waste collection system | Henry B. Polston | 1994-08-30 |
| 5336333 | Method for cleaning waste collection systems | Henry B. Polston | 1994-08-09 |
| 5129957 | Method for cleaning sewers | Henry B. Polston | 1992-07-14 |
| 5068940 | Apparatus for cleaning sewers | Henry B. Polston | 1991-12-03 |