Substituted 9h-purines
CA 2000154 A1 · Owner: Allgeier, Hans · Inventors: Allgeier, Hans
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
4-17262/+, Substituted 9H-purines, Abstract of the Disclosure The invention relates to novel 9H-purine derivatives especially to thenovel substituted 9-benzyl-9H-purines of the general formula (I), in which Ph is a phenyl radical substituted by halogen R1 is hydrogen or, a free amino group or an amino group that is substituted aliphatically cycloaliphatically, cycloaliphatically-aliphatically and/or by acyl and, R2 is halogen, lower alkoxy, lower alkyl a free amino group, or an amino, group that is substituted aliphatically cycloaliphatically, cycloali-, phatically-aliphatically and/or by acyl with the proviso that R2 is, other than halogen when Ph is 2-fluorophenyl or 2,5- or …
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 October 4, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 4, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 4, 2011.
- 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.