Preparation for oxidation-sensitive compounds and method for making same
CA 2475218 C · Owner: Vachy, Robert · Inventors: Vachy, Robert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a method which consists in preventing oxidation of an active oxygen-sensitive compound of a medicinal and/or cosmetic formulation including at least a strong antioxidant and at least a weak antioxidant with high coating capacity the strong antioxidant reacting with the oxygen before the active compound and the weak antioxidant reacting with the residual oxygen to form after oxidation, highly coating particles which aggregate by micronization around the active compound to form a protective plaster. The invention is applicable in particular to compounds derived from 2,6-di-tert-butylphenol.
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 February 4, 2003 and granted September 11, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 4, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 4, 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.