Issued Patents All Time
Showing 26–38 of 38 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5435779 | Precision gas flow control by use of coarse and fine control elements | Eric Desrochers | 1995-07-25 |
| 5406073 | System for detecting a movable entity within a selected space | Phillip G. Ahern | 1995-04-11 |
| 5385505 | Pressure maintenance system for substantially sealed space | Eric Desrochers | 1995-01-31 |
| 5304093 | Method and apparatus for controlling a fluid flow valve | Rodney R. Stewart, Alexander Dolgin | 1994-04-19 |
| 5240455 | Method and apparatus for controlling a fume hood | — | 1993-08-31 |
| 5117746 | Fume hood sash sensing apparatus | — | 1992-06-02 |
| 4893551 | Fume hood sash sensing apparatus | Jerome J. Schaufeld | 1990-01-16 |
| 4773311 | Make up air controller for use with fume hood systems | — | 1988-09-27 |
| 4706553 | Fume hood controller | William P. Curtiss, George B. Yundt | 1987-11-17 |
| 4528898 | Fume hood controller | William P. Curtiss, George B. Yundt | 1985-07-16 |
| 4469997 | Self generative PWM voltage source inverter induction motor drive | William P. Curtiss | 1984-09-04 |
| 4400655 | Self generative variable speed induction motor drive | William P. Curtiss | 1983-08-23 |
| 4215500 | Visual display device | — | 1980-08-05 |