Amphetamine derivatives
CA 1073913 A · Owner: Astra Lakemedel Aktiebolag · Inventors: Ross, Svante B.; Florvall, Gosta L.; Ogren, Sven-Ove
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to compounds conforming to the general formula:, (A), wherein R1 and R2 are the same or different and each represents a hydrogen atom, a lower alkyl group or a halogen atom; represents either (i) a group or (ii) a group , in which R5 represents a hydrogen atom or a methyl group, R6 is a lower alkyl group and Z is a lower aliphatic acyl group, and when X is a , group R represents a lower alkyl group a, benzyl group, a lower aliphatic acyl group or a benzoyl group or when X is a , group R represents a lower alkyl or benzyl group; and R4 represents a hydrogen atom, a lower alkyl group a benzyl group or a -CH2CH2CH2 bridge converted to the phenyl ring in the …
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 March 18, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 18, 1997.
- 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.