(perhaloethyl)aromatic compounds and (perhaloethenyl)aromatic compounds therefrom
CA 2279764 A1 · Owner: Minnesota Mining And Manufacturing Company · Inventors: Tiers, George Van Dyke
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A synthesis is provided for .alpha..beta.-difluoro-.beta.-halo-ethenyl aromatic, compounds such as .alpha..beta..beta.-trifluorostyrenes by a process of reacting CFX2CFXI, wherein each X is independently F or Cl provided that at least one X is Cl , and at least one X is F, with an aromatic compound Ar to form (CFX2CFX)n-Ar wherein, n is 1, 2 or 3, and subsequently dechlorohalogenating this product to form (CFX=CF)n-Ar. Novel synthetic intermediate compounds are provided.
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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 July 30, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 30, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 30, 2021.
- 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.