Method of separating polyethyleneterephthalate (pet) and polyvinylchloride (pvc)
CA 2094035 C · Owner: Geisler, Iring · Inventors: Hollstein, Axel; Kleine-Kleffmann, Ulrich; Geisler, Iring
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In the method disclosed, plastics materials in particular materials of , similar density such as poly(ethylene terephthalate) and poly(vinyl chloride), are separated using electrostatic techniques the , mixture being subjected to heat treatment to charge it tribo-electrically.
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
- Filed July 4, 1992 and granted September 16, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 4, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 4, 2014.
- 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.