Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4306891 | Separator for precipitating particulate from an airflow | Ralph H. Clarke, Wesley J. Clarke | 1981-12-22 |
| 4202677 | Filter bag with removable shaping members | Ralph H. Clarke, W. James Clarke | 1980-05-13 |