Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6024638 | Fume hood having a driven sash and a travel interference system for the sash | Robert L. Berlin, Warren L. Zeigler | 2000-02-15 |
| 5303659 | Down draft work table | Robert M. Berlin, Warren L. Zeigler, Waynne R. Zeigler | 1994-04-19 |
| 4774878 | Trimodal piston driven sash operator | Robert M. Berlin, Warren Ziegler | 1988-10-04 |
| 4502375 | Fume hood sash operator | Alan L. Hignite, Roy F. Zeigler, Warren L. Zeigler | 1985-03-05 |