Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7708555 | Gas-fired heating unit | — | 2010-05-04 |
| 7341448 | Gas-fired heating apparatus | — | 2008-03-11 |
| 7299768 | Gas-fired water heating apparatus | — | 2007-11-27 |
| 7252052 | Gas-fired heating apparatus | Robert Hirsch, Klaas W. Roelfsema | 2007-08-07 |
| 6945196 | Gas-fired water heater | Stefan Hubert, Oliver Forberich, Klaas W. Roelfsema, Rainer Neubauer | 2005-09-20 |