Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4537678 | Rotary biological contactor | — | 1985-08-27 |
| 4522714 | Water treatment apparatus | — | 1985-06-11 |
| 4319949 | Machine for heat sealing polymeric sheets into a spiral drum | Jerry J. Ferwerda, Milford J. Tweet, Ronald D. Hatfield | 1982-03-16 |
| 4284396 | Apparatus for vacuum thermoforming polymeric sheet material | Jerry J. Ferwerda, Milford J. Tweet, Ronald D. Hatfield | 1981-08-18 |