Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4862538 | Multi-section mattress overlay for systematized pressure dispersion | Donald C. Spann, Daniel J. Schaefer | 1989-09-05 |
| 4840634 | Calibration controller for controlling electrically operated machines | Walter Muller | 1989-06-20 |