Production of acrylic monomers
CA 2356359 A1 · Owner: Littlewood, Peter Stuart · Inventors: Singh, Michael; Littlewood, Peter Stuart
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the preparation of a mixture comprising a compound of formula (1) and a compound of formula (2), wherein R1 is an optionally substituted C1- 20alkyl, optionally substituted C3-4alkenyl optionally substituted C5-, 7cycloalkyl or optionally substituted benzyl R2 is an optionally substituted , C1-20alkyl optionally substituted C3-4alkenyl or optionally substituted C5- 7cycloalkyl, A is either S or NR3, R3 is an optionally substituted C1-20alkyl optionally substituted C3-4alkenyl or optionally substituted C5-7cycloalkyl or R2 and R3 together form a 5-7 membered ring which can contain an oxygen atom, R4 is hydrogen or methyl, R5 is an optionally substituted C1-20alkyl optionally …
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 January 12, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 12, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 12, 2022.
- 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.