Kojic acid derivatives
CA 2135824 A1 · Owner: Pacific Corporation · Inventors: Lee, Ki W.; Chang, Dong I.; Lee, Byeong G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed herein is novel kojic acid derivatives represented by the following formula (I): (I), wherein R1 is a hydrogen atom or hydroxyl group; and R2 is a hydroxyl group. having a strong activity of inhibiting tyrosinase, which is involved in a melanin formation. The compounds of the present invention shows a stronger tyrosinase-inhibiting and radical scavenging activities and, has a low side effects to the human skin.
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 15, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 15, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 15, 2016.
- 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.