20-aralkyl-5.alpha.-pregnane derivatives
CA 2289675 A1 · Owner: Van Der Louw, Jaap · Inventors: Leemhuis, Johannes Antonius Joseph; Groen, Marinus Bernard; Van Der Louw, Jaap
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to 20-aralkyl-5.alpha.-pregnane derivative having general formula (I), or a pharmaceutically acceptable salt thereof wherein R1 , is (H,OR), (H,OSO3H) or NOR; R is H (C1-6)alkyl or (C1-6)acyl; each of R2 and R3 is independently hydrogen or (C1-6)alkyl; X is a straight chain divalent C1- 8 hydrocarbon radical, optionally comprising a double or a triple bond; or X is -(CH2)m-CR7R8-; m = 0-4; at least one of R7 and R8 is (C1-4)alkyl hydroxy, (C1-4)alkoxy or halogen; the other if present, being hydrogen; or R7 and R8 together represent O or NOR'; R' is H, (C1-6)alkyl or (C1-6)acyl; each of R4 R5 and R6 is independently hydrogen, hydroxy (C1-4)alkoxy, halogen, NR9, R10 …
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 11, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 11, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 11, 2020.
- 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.