Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4555607 | Process for installation and removal of glass pane from a frame | Paul Roentgen, Helmut Krumm, Gunter Lenzen | 1985-11-26 |
| 4373130 | Concealed electric heating element arrangement for vehicle windshields | Paul Roentgen, Wilhelm Meier, Josef Erdweg | 1983-02-08 |