Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4334826 | Surface aerator impeller | John R. Connolly, David E. Gibson, Edward L. Heimark, Richard E. Speechley, Richard L. Winter | 1982-06-15 |
| 4249863 | Surface aerator impeller | John R. Connolly, David E. Gibson, Edward L. Heimark, Richard E. Speechley, Richard L. Winter | 1981-02-10 |