Issued Patents 1989
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4848803 | Fabric expansion joints for exhaust systems of gas turbines | — | 1989-07-18 |
| 4832527 | Vertically reciprocable gates for the control of a liquid media | — | 1989-05-23 |
| 4823836 | Dampers with leaf spring seals | William F. Koch | 1989-04-25 |
| 4821507 | Gas flow diverter | William F. Koch | 1989-04-18 |
| 4800919 | Flap gate assembly | — | 1989-01-31 |