Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5676281 | Fluid flow airlock valve | — | 1997-10-14 |
| 5539166 | Pneumatic-electrical control device | — | 1996-07-23 |
| 5251684 | Method for controlling the oxidation and calcination of waste foundry sands | Robert S. Andrews | 1993-10-12 |
| 5217170 | Method for both cooling and pneumatically scrubbing a calcined, particulate material | — | 1993-06-08 |
| 4978076 | Method for separating hazardous substances in waste foundry sands | Robert S. Andrews | 1990-12-18 |
| 4618353 | Filter bag assembly | — | 1986-10-21 |
| 4481022 | Filter bag assembly | — | 1984-11-06 |