Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6431609 | Pipe connection for ventilating duct system | — | 2002-08-13 |
| D447223 | Sealing rings for ventilation ducts | Lars-åke Mattsson, Kenneth Lennartsson, Tomas Persson | 2001-08-28 |
| 6170883 | Tubular element with sealing means and a method for manufacturing the tubular element | Lars-åke Mattsson, Kenneth Lennartsson, Tomas Persson | 2001-01-09 |
| 6062610 | Device for the coupling together of pipes | Werner J. Andresen | 2000-05-16 |
| 6030005 | Method and device for coupling pipes | Werner J. Andresen | 2000-02-29 |