Method of separating a peptide from a resin
CA 2108170 C · Owner: Mallinckrodt Chemical, Inc. · Inventors: Chieng, Paul C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In solid phase peptide synthesis, resin-bound peptide is treated with hydrogen fluoride so as to cleave the peptide from the resin and form a first mixture of peptide hydrogen fluoride and resin. The , resin is removed from the first mixture so as to provide a resin-free second mixture including the polypeptide and the hydrogen fluoride. The polypeptide of the second mixture then is separated from the hydrogen fluoride.
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 March 13, 1992 and granted August 13, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 13, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 13, 2014.
- 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.