Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4594026 | Wedge member for assembling tunnel shield voussoirs | Jean-Claude Hauer | 1986-06-10 |
| 4499695 | Manhole | Jean-Claude Hauer, Jean-Louis Freis | 1985-02-19 |
| 4494891 | Grating for a highway construction in particular for a sewer opening | Jean-Claude Hauer | 1985-01-22 |
| 4456397 | Road inspection manhole | Jean-Louis Freis, Jean-Claude Hauer | 1984-06-26 |
| 4318637 | Process and device for the assembly of voussoirs for tunnel linings | Jean-Claude Hauer | 1982-03-09 |