Method for extruding polyolefins containing vinylidene chloride polymers
CA 2102366 A1 · Owner: Su, Tien-Kuei · Inventors: Su, Tien-Kuei
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for extruding polypropylene containing vinylidene chloride polymers (PVdC). According to the present invention the polymers are extruded using extrusion equipment coated with a fluoropolymer. This method improves the processability alleviates thermal degradation of the PvdC improves the extrudate quality by reducing discoloration and voids in surfaces of the extruded product and protects the equipment by reducing the corrosive wear.
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 November 3, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 3, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 3, 2015.
- 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.