Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6108489 | Food warning device containing a rechargeable phase change material | Sigurd Frohlich, Ival O. Salyer | 2000-08-22 |
| 5884006 | Rechargeable phase change material unit and food warming device | Sigurd Frohlich | 1999-03-16 |
| 5528219 | Ropeway safety monitoring system | Sigurd Frohlich, Reinhold Zauner, Georg Schurian | 1996-06-18 |