Method and an apparatus for producing plastics material films
CA 1286467 C · Owner: Stockmeyer, Hans · Inventors: Stockmeyer, Hans
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and an apparatus for producing plastics material films, A method and an apparatus are provided to prevent specks of condensation products being formed on a plastics material film produced by a calendering technique. In the method, after the film has left the final calender roller, the film is passed around at least one take-up roller and is blown against the shell of the roller by compressed air issuing from nozzles. Whilst on the shell of the roller the film is cooled to a temperature below the condensation temperature of the volatile substances released from the surface of the film.
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 23, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 23, 2008.
- 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.