A tramadol n-oxide material, enantiomers and compositions thereof, and their use
CA 2078028 C · Owner: Villani, Frank J. · Inventors: Maryanoff, Cynthia A.; Raffa, Robert B.; Villani, Frank J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to a tramadol N-oxide material enantiomers and compositions thereof and their use. The tramadol Noxide material and compositions thereof are pharmacologically useful in treating pain, diarrhea and tussive conditions. The tramadol Noxide is also subject to less side-effects as compared to pure opiate based compositions, such as abuse liability tolerance, constipation, and respiratory depression. Furthermore the tramadol N-oxide, material when administered orally exhibits analgesia for a longer duration than an equi-analgesic amount of tramadol.
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 September 11, 1992 and granted April 29, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 11, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 11, 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.