14.alpha. 17.alpha.-(propano and 17²-propeno)estratrienes
CA 2107787 A1 · Owner: Elger, Walter · Inventors: Fritzemeier, Karl-Heinrich; Elger, Walter; Bull, James R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
14.alpha. 17.alpha.- (propano and 172-propeno) estratrienes of the general formula (I), in which R1 is a hydrogen atom a methyl, or acyl group with 1-12 carbon atoms R2 is a hydrogen atom, or an acyl group with 1-12 carbon atoms and (a) is a C-C single or double bond. The novel compounds of the general formula (I) are oestrogenically active like ethinyl estradiol.
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 April 30, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 30, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 30, 2014.
- 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.