Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5694731 | Fire resistant frame structure for windows, doors, facades or glass roofs | Armin Tonsmann, Frank Mantwill, Eitel-Friedrich Hocker | 1997-12-09 |
| 5618127 | T-connector between two profiles | Armin Tonsmann | 1997-04-08 |