Issued Patents All Time
Showing 51–62 of 62 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4587874 | Rotary punch | Gerd P. H. Lupke | 1986-05-13 |
| 4553923 | Producing thermoplastic articles particularly with porous walls | — | 1985-11-19 |
| 4545751 | Apparatus for molding of plastic tubing | — | 1985-10-08 |
| 4534923 | Method and apparatus for forming a double walled thermoplastic tube with integral bells | — | 1985-08-13 |
| 4510013 | Apparatus for producing multi-walled thermoplastic tubing | Gerd P. H. Lupke | 1985-04-09 |
| 4504206 | Chainless mold drive for a corrugator or the like | Gerd P. H. Lupke | 1985-03-12 |
| 4325685 | Apparatus for producing thermoplastic tubing having interchangeable mold blocks | Gerd P. H. Lupke | 1982-04-20 |
| 4319872 | Apparatus for producing thermoplastic tubing | Gerd P. H. Lupke | 1982-03-16 |
| 4305703 | Composite die assembly for use in the production of thermoplastic tubing | Gerd P. H. Lupke | 1981-12-15 |
| 4226580 | Apparatus for producing thermoplastic tubing | Gerd P. H. Lupke | 1980-10-07 |
| 4218164 | Apparatus and method for perforating tubing | Gerd P. H. Lupke | 1980-08-19 |
| 4199314 | Apparatus for producing thermoplastic tubing | Gerd P. H. Lupke | 1980-04-22 |