Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4710325 | Aspirating aeration and liquid mixing apparatus | Roy A. Cramer | 1987-12-01 |
| 4671872 | Aerator mast with azimuth lock and bottom stop | Roy A. Cramer | 1987-06-09 |
| 4581182 | Submersible mixer with air injection | Roy A. Cramer | 1986-04-08 |
| 4514343 | Aspirating horizontal mixer | Roy A. Cramer | 1985-04-30 |
| 4464259 | Hydraulic horizontal mixer | Roy A. Cramer | 1984-08-07 |
| 4431597 | Horizontal mixing aerator | Roy A. Cramer | 1984-02-14 |