Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D303430 | Transcutaneous electrical nerve stimulator | John E. Studer, Joel R. Dufresne | 1989-09-12 |
| 4803986 | Ergonometric transcutaneous electrical nerve stimulator | Joel R. Dufresne, John E. Studer | 1989-02-14 |