Xylene isomerization process
CA 2286736 A1 · Owner: Kao, Jar-Lin · Inventors: Kao, Jar-Lin; Demartin, Greg; Soled, Stuart
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for isomerizing a non-equilibrium xylene feed mixture is disclosed. The izomerization is conducted in the presence of hydrogen and at pressures in excess of 75 psig (517 kPa) over a ZSM-5 type catalyst containing about 0.1 to 5 wt.% of at least one metal selected from the group consisting of zinc copper, silver and gallium. In another embodiment the catalyst may further , contain an oxide of at least one element selected from silicon germanium and , tin. The process produces a product containing about or above equilibrium quantities of para-xylene with low xylene loss.
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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 April 17, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 17, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 17, 2020.
- 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.