Expired Canadian patentCanada
Water-soluble vitamin a preparations for application to the skin
CA 2033183 C · Owner: Olson, James Allen · Inventors: Gunning, Desiree; Olson, James Allen; Barua, Arun B.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A non-irritating topical medicament is provided which contains retinoic acid glucuronide as the active ingredient. The medicament may be applied to the skin for treatment of acne or skin aging.
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 May 22, 1990 and granted May 13, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 22, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 22, 2012.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMay 22, 1990
GrantedMay 13, 1997
Term endedMay 22, 2010
Patent numberCA 2033183 C
Classification (IPC)A61K31/70 +2 more
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.