Alkylation of aromatic amines using a heteropoly catalyst
CA 2205098 A1 · Owner: Rhubright, Douglas C. · Inventors: Zhu, Ping Y.; Burrington, James D.; Rhubright, Douglas C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Aliphatic hydrocarbyl-substituted aromatic amines are prepared by reacting an aromatic amine and an aliphatic hydrocarbylating agent such as an olefin, in the, presence of a heteropolyacid catalyst such as Cs2.5H0.5PW12O40 for a period of, time and at a temperature sufficient to permit reaction.
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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 May 12, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 12, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 12, 2019.
- 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.