Syntheses of 5,5'-diformyl-2,2'difuran and derivatives thereof
CA 2310102 A1 · Owner: Burger, Gregory James · Inventors: Burger, Gregory James; Wills, Alan Douglas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
5,5'-diformyl-2,2'-difuran is prepared in excellent yield by photochemically irradiating furfural or a mixture of furfural and 5-bromo-2-furfural. In the latter case an acid scavenger is present. The solvent is acetonitrile. The process may be carried out continuously the 5-bromo-2-furfural acting as a , catalyst the furfural being added, and the product being harvested continuously.
Read the whole patent
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 September 15, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 15, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 15, 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.