19,8-lactone steroid derivatives and processes of preparation thereof
CA 1046501 A · Owner: Steele Chemicals Company Limited · Inventors: Kruger, Gunther
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There are provided novel 19,8-lactone steroid derivatives having the formula, (I), wherein A and B represent 14- or 15-carbon atoms respectively, which are either linked by a double bond or which carry an u-, or .beta.-oxido or a 14.alpha.- or .beta.-hydroxy group in which case B is a methylene group Y is =O; 3.alpha. or 3.beta.-hydroxy; O-alkyl; or O-acyl; R' is OH, =O or acetoxy, the 5-hydrogen atom is either in the .alpha. or .beta.-position; there is an optional double bond in position 4(5); 5(6) and 6(7); and R is selected from the group consisting of O-alkyl; , ; , ;, ; , ; , ; , ; ;, ; , ; , ; , ;, ; , ; , ; , ;, and CN wherein alkyl is tetrahydropyranyl, lower alkyl preferably …
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
- Granted January 16, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 16, 1996.
- 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.