Cold refining of extruded polymer film
CA 1198354 A · Owner: Brocard, Pierre · Inventors: Brocard, Pierre
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus for cold refining extruded plastic film, including advancing the film through a lateral stretching station while applying heat centrally of the film and gradually laterally from the central longitudinal axis of the film, then overstretching the film longitudinally and allowing the film to relax and taking up the film at a length greater than its original length and thinner than its original thickness, while maintaining the physical characteristics of the plastic 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 December 24, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 24, 2002.
- 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.