Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4813418 | Nerve fiber stimulation using symmetrical biphasic waveform applied through plural equally active electrodes | — | 1989-03-21 |
| 4812343 | Pultruded fiber reinforced plastic marking devices | John H. Kiekhaefer, Jack E. Perko, Joseph S. Hetzer | 1989-03-14 |