Extrusion process and single, dual or multiple-worm extruder
CA 1314675 C · Owner: Dollhopf, Rudiger · Inventors: Dollhopf, Rudiger; Nandzik, Bernd
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In the case of the extruder the thread of the, worm, or that of the worms is partly left-handed and partly, right-handed so that one part of the material to be processed is conveyed in direction A, while the other part is conveyed in the opposite direction B. The process is a degasifying-extrusion-process and the extruder is a degasifying extruder: the following are provided: a reverse-degasifying arrangement at the end of the worm or, worms, if the material to be processed is carried away from this end, and/or a reverse-degasifying arrangement at the location between the threaded sections of the worm or, worms, whence the material to be processed is carried away in opposite directions B …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted March 23, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 23, 2010.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.