Optical isomer separating agents
CA 2055869 A1 · Owner: Eisai Co. Ltd. · Inventors: Fujima, Hiroya; Wada, Hiroo; Miwa, Toshinobu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical isomer separating agent is disclosed which comprises a stationary phase in which the molecular structure of ovomucoid initially fixed to a carrier is partly modified, or a stationary phase in which ovomucoid having the molecule partly modified first is subsequently fixed to a carrier. A process for producing an optical isomer separating agent comprising the steps of immobilizing ovomucoid on a carrier and modifying the ovomucoid is also disclosed. Furthermore a process is disclosed for producing an optical isomer separating agent comprising the steps of modifying ovomucoid and immobilizing the modified ovomucoid on a carrier.
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 November 20, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 20, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 20, 2013.
- 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.