Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4840223 | Power back scrubbing and flushing system for cooling systems | — | 1989-06-20 |
| 4802828 | Turbine blade having a fused metal-ceramic tip | David A. Rutz, Robert P. Schaefer, Edward L. Johnson | 1989-02-07 |