Process and device for the production of plastic films
CA 1330697 C · Owner: Vetter, Heinz · Inventors: Vetter, Heinz
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A smooth film web is used as a smoothing surface in the nip between a cooling roll and a pressure roll. The pressure roll need not be coolable and it, preferably has an elastic surface layer. Since the elastic surface layer does not come into immediate contact with the extruded web. it need not be highly polished. Consequently, a high running time is achieved.
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 July 19, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 19, 2011.
- 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.