Issued Patents All Time
Showing 26–50 of 62 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6155813 | Pipe molding apparatus with air assist of plastic onto cooling plug | Stefan A. Lupke | 2000-12-05 |
| 6089851 | Mold block with air flow control | Stefan A. Lupke | 2000-07-18 |
| 6056528 | Extruder head mandrel spider | Stefan A. Lupke | 2000-05-02 |
| 6054089 | Method and apparatus of cooling product within a mold | Stefan A. Lupke | 2000-04-25 |
| 6050805 | Extrusion equipment having means for adjusting a delivery end of a die with respect to the extruder for alignment with downstream equipment | — | 2000-04-18 |
| 5824351 | Molding apparatus with non-reflective mold tunnels | Stefan A. Lupke | 1998-10-20 |
| 5744091 | Apparatus for making annularly ribbed plastic pipe and method of making such pipe | — | 1998-04-28 |
| 5605083 | Pipe cutting apparatus with differential speed rotatable ring cutter actuation | Stefan A. Lupke | 1997-02-25 |
| 5582849 | Travelling mold with mold block carriers | — | 1996-12-10 |
| 5576032 | Extrusion die with interchangeable extrusion nozzles | — | 1996-11-19 |
| 5573787 | Mold apparatus with cooling channels | Stefan A. Lupke | 1996-11-12 |
| 5531585 | Travelling mold with separation of mold blocks | — | 1996-07-02 |
| 5525289 | Method and apparatus for cooling hollow molded product | Stefan A. Lupke | 1996-06-11 |
| 5456589 | Multicavity mold blocks | — | 1995-10-10 |
| 5405569 | Method and apparatus for forming a double walled thermoplastic tube with integral bells | — | 1995-04-11 |
| 5372774 | Process of and apparatus for making plastic tubing | — | 1994-12-13 |
| 5324557 | Multi-skin annularly ribbed tube | — | 1994-06-28 |
| 5123827 | Extrusion die having elongated extrusion nozzle with facilitates tool changes | — | 1992-06-23 |
| 5023029 | Method and apparatus for producing pipe with annular ribs | — | 1991-06-11 |
| 5002478 | Improvements in suction applying mold blocks in pipe forming apparatus | — | 1991-03-26 |
| 4995800 | Extrusion die assembly | — | 1991-02-26 |
| 4936768 | Extrusion die for externally ribbed plastic tubing | — | 1990-06-26 |
| 4770618 | Extrusion die for two-ply plastic tubing | — | 1988-09-13 |
| 4712993 | Extrusion die for externally ribbed plastic tubing | — | 1987-12-15 |
| 4681526 | Apparatus for molding thermoplastic pipes | — | 1987-07-21 |