Issued Patents All Time
Showing 1–14 of 14 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8006439 | Closing device | Francis Berthon | 2011-08-30 |
| 7942289 | Device for closing an opening, particularly a street manhole | Jean-Paul Pietrzak | 2011-05-17 |
| 7448512 | Device for closing an opening, particularly a man hole | Jean-Paul Pietrzak | 2008-11-11 |
| 6735992 | Device for mutually locking two elements, in particular a covering element to an element forming a support frame | Patrice Vauthier | 2004-05-18 |
| 6722813 | Road network device with articulated cover | Francis Berthon | 2004-04-20 |
| 6676332 | Highway device and covering element for such a device | Jean-Paul Pietrzak | 2004-01-13 |
| 6053538 | Ball and socket joint for the waterproof assembly of two pipe elements | Francis Berthon | 2000-04-25 |
| 4840514 | Manhole assembly with T-shaped hinge | Andre Defrance | 1989-06-20 |
| 4763449 | Manhole cover sealing and locking arrangement | Pierre Vigneron | 1988-08-16 |
| 4594026 | Wedge member for assembling tunnel shield voussoirs | Jacques Oger | 1986-06-10 |
| 4499695 | Manhole | Jacques Oger, Jean-Louis Freis | 1985-02-19 |
| 4494891 | Grating for a highway construction in particular for a sewer opening | Jacques Oger | 1985-01-22 |
| 4456397 | Road inspection manhole | Jean-Louis Freis, Jacques Oger | 1984-06-26 |
| 4318637 | Process and device for the assembly of voussoirs for tunnel linings | Jacques Oger | 1982-03-09 |