Production of para-xylene by selective methylation of toluene with methyl halides
CA 2103116 C · Owner: Guelph Chemical Laboratories Ltd. · Inventors: Fouda, Safaa Abdelsamie; Pandey, Raj N.; Nayak, Vikram Santu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The selective methylation of toluene to produce para-xylene is effected by reacting toluene with a methyl halide at a temperature ranging from about 100 to about 500°C and a pressure ranging from about 1 to about 10 atmospheres, in the presence of a shape-selective zeolite catalyst in protonated form having a Si/Al ratio of at least about 25 the zeolite, catalyst being either unmodified or modified with a heteropoly acid.
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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 November 15, 1993 and granted March 7, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 15, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 15, 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.