External skin treatment agent composition containing prostacyclins as active ingredient
CA 2133334 A1 · Owner: Makino, Yuji · Inventors: Hazato, Atsuo; Koyama, Tamotsu; Hanajima, Nobuaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An external skin treatment agent composition containing an active ingredient comprising of a prostacyclin, and/or its optical isomer having the, formula (I):, (I), (wherein R1 is a hydrogen atom, a straight chain or branched alkyl group of C1 to C10, or one equivalent of cations, R2 is , or a substitutable C3 to C10 cycloalkyl group, where R21 is a substitutable C1 to C10 straight chain or branched alkyl group or substitutable C2 to C10 straight chain or branched alkenyl group or alkynyl group, and R3 and R4 are independently a hydroxyl group or formula, (wherein, R5 is a C1 to C5 straight chain or branched alkyl group)) and a carrier.
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 3, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 3, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 3, 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.