Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6491736 | Polyhydric alcohol anti-dust agent for inorganic materials | Fred S. Bell | 2002-12-10 |
| 5303843 | Fluid transport apparatus with water hammer eliminator system | Donald L. Zink, John E. Schwartz | 1994-04-19 |
| 5285998 | Internal valve for pressure fluid containment vessels | Donald L. Zink | 1994-02-15 |
| 5280874 | Internal valve | Donald L. Zink, John E. Schwartz | 1994-01-25 |
| 5222517 | Fluid containment vessel with one or more recessed wells | Donald L. Zink, John E. Schwartz | 1993-06-29 |
| 5211202 | Fluid apparatus with pressure-tight recessed well | Donald L. Zink | 1993-05-18 |
| 5141013 | Fluid containment apparatus | Donald L. Zink | 1992-08-25 |
| 5097976 | Fluid containment apparatus with well closure assembly | Donald L. Zink | 1992-03-24 |