Issued Patents All Time
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4634844 | Electroweldable socket and a device of manufacturing such a socket | Bernhard Lodder, Hans Overeijnder | 1987-01-06 |
| 4566704 | Sealing body for a pipe connection | — | 1986-01-28 |
| 4492867 | Method of and apparatus for determining the state of ageing of plastic products | Johannes J. Laarhoven, Hendrik de Wit, Louis Marie SMEETS | 1985-01-08 |
| 4440195 | Plastic tube with longitudinal channels in the wall | — | 1984-04-03 |
| 4390383 | Method of making plastic pipes having walls with lengthwise extending channels | — | 1983-06-28 |
| 4362323 | Pipe part with a socket end | Bernhard Lodder, Gerard A. E. Blok | 1982-12-07 |
| 4341392 | Plastics pipes having walls with lengthwise extending channels | — | 1982-07-27 |
| 4323339 | Device for manufacturing plastics pipes with oblong channels | Johan de Kok | 1982-04-06 |
| 4305899 | Method of manufacturing a plastic tube with longitudinal channels in the wall | — | 1981-12-15 |
| 4280534 | Plastics pipes having walls with lengthwise extending channels | — | 1981-07-28 |