Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7350960 | Dual flight rotors for continuous mixer assembly | Kelly Ziegenfus, H. Slayton Altenburg, Harold Schafer, James Hower | 2008-04-01 |
| 6390666 | Packing gland seal assembly as an upstream seal for mixer rotors | Harold Schafer, Kelly Ziegenfus | 2002-05-21 |