High concentration formulations of opioids and opioid derivatives
CA 2507356 A1 · Owner: Durect Corporation · Inventors: Lee, Min; Tamraz, Wilma; Chan, Tai Wah
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides opioid formulations suitable for long-term delivery to a subject. The formulation of the invention comprises an opioid or opioid derivative (e.g. morphine, hydromorphone fentanyl or a fentanyl , congener), and an aqueous solvent comprising a low molecular weight carboxylic acid (e.g. C2-4, C2-7). The invention thus provides for formulations comprising morphine, hydromorphone, fentanyl or fentanyl congeners in concentrations significantly in excess of conventional aqueous formulations e.g. on the order about 2-fold to about 10,000-fold greater than conventional formulations, e.g. currently commercially available formulations.
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 25, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 25, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 25, 2025.
- 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.