Process and apparatus for removing unpolymerized gaseous monomers from olefin polymers
CA 2186301 C · Owner: Union Carbide Chemicals & Plastics Technology Corporation · Inventors: Wang, Duan Fan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus for removing monomers from a solid olefin polymer containing the monomers which comprises a purge vessel having tapered wherein the vessel has a height-to-bottom-diameter ratio of 0.5:1 to 10:1 and the walls have a tapered angle based on a vertical axis of 0.5 to 15 degrees; a solid discharge element disposed in the lower portion of the purge vessel; a solids receiving hopper; a solids inlet disposed in the receiving hopper; a feeding means disposed in the receiving hopper in communication with an inlet for feeding solids to the purge vessel; a gas-permeable, solids-impermeable constraint means disposed below the feeding means defining the upper limit of an expanded bed of …
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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 September 24, 1996 and granted January 9, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 24, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 24, 2018.
- 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
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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.