Method of producing bisphenol-a (bpa)
CA 2356433 A1 · Owner: Jackson, Barrie W. · Inventors: Jackson, Barrie W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Acetone and phenol are reacted over a strong acid catalyst in the presence of lower alcohol. The, lower alcohol can be methanol ethanol, n-propanol, iso-propanol, n-butanol sec-butanol, tertiary-, butanol and iso-butanol. For each mole of acetone one mole or more of lower alcohol is provided, and two to four moles of lower alcohol are preferred.
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 August 31, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 31, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 31, 2023.
- 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.