Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5375992 | Triple channel wave screw | William N. Calland | 1994-12-27 |
| 5219590 | Triple channel wave screw | William N. Calland | 1993-06-15 |
| 5035509 | Multi-channel extrusion screw with a zig-zag undercut barrier | — | 1991-07-30 |
| 4363768 | Method of injection molding employing multichannel wave screw | — | 1982-12-14 |
| 4356140 | Extrusion method with short cycle multichannel wave screw | — | 1982-10-26 |
| 4285600 | Injection molding machine with multichannel wave screw | — | 1981-08-25 |
| 4277182 | Extruder with short cycle multichannel wave screw | — | 1981-07-07 |