Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6345410 | Drain opening device | — | 2002-02-12 |
| 5406714 | Level vial assembly | John D. Olson | 1995-04-18 |
| 4689201 | Prevention of corrosion | Stuart W. Longworth | 1987-08-25 |
| 4566972 | Treatment of aqueous systems | John J. Bennison, Stuart W. Longworth | 1986-01-28 |