Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4633498 | Infrared headphones for the hearing impaired | Klaus Willemsen | 1986-12-30 |
| 4573449 | Method for stimulating the falling asleep and/or relaxing behavior of a person and an arrangement therefor | — | 1986-03-04 |