Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4744154 | Measuring and controlling the moisture content of hair | Siegfried Hollmann, Detlef Mattinger | 1988-05-17 |
| 4541442 | Heat treatment apparatus for heating human hair on the head | Siegfried Hollmann, Dieter Hoch | 1985-09-17 |