Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7770240 | Safety helmet with a breathing mask | Michael Rosert, Dirk Feil, Siegbert Tolk | 2010-08-10 |
| 7770581 | Breathing mask | Olaf Balke, Siegbert Tolk | 2010-08-10 |
| 7575004 | Gas mask for normal pressure operation and overpressure operation | Rüdiger Weich, Thomas Grassl, Rüdiger Müller, Siegbert Tolk, Olaf Balke | 2009-08-18 |
| 6305370 | Voice transmitter for a breathing protective mask | Michael Rosert | 2001-10-23 |
| 5454369 | Breathing mask with fixed mask body | Rüdiger Müller, Thomas Neuber | 1995-10-03 |
| 5411021 | Breathing mask with speaking device | Rüdiger Müller, Thomas Neuber | 1995-05-02 |
| 4276877 | Respiratory method and apparatus | — | 1981-07-07 |