Process for separation of hydrolyzable from non-hydrolyzable waste plastics for recovery of starting materials and other conversion processes, respectively
CA 2084690 A1 · Owner: Wellman, William E. · Inventors: Wellman, William E.; Saleh, Ramzi Y.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a process for reactively separating hydrolyzable polymers, such as PET in mixtures of the, polymer and certain non-hydrolyzable polymers specifically polyole-, fins by converting the hydrolyzable polymers to their corresponding water soluble components (e.g. PET to ethylene glycol and terephthalic acid) in the presence of liquid water at temperatures from about 200°C up to the critical temperature of water and autogenous pressure. The process has utility in recycling and waste material separation processes.
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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 December 7, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 7, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 7, 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.