Enantiomeric silanes, modified packing material, and use thereof
CA 2005855 A1 · Owner: Lohmann, Dieter · Inventors: Dappen, Richard; Lohmann, Dieter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A compound of formula I (I), wherein, R1 is C1-C4alkyl, phenyl or benzyl R2 is C1-C4alkyl, phenyl or benzyl, a is 0,1 or 2 R3 is linear or branched unsubstituted or OH-substituted C1-C12alkylene or is phenylene R5 is the divalent radical, diminished by the -CO-O group of a lactone having a total of 4, to 7 ring members and containing at least one chiral carbon atom and corresponding predominantly to an optically active enantiomeric form R4 is a direct bond, C1-C4alkyl-CH or CF3-CH and, Y is phenyl, naphthyl, fluorenyl or anthryl each unsubstituted or substituted by, C1-C12alkyl C1-C12alkoxy, halogen, -CN or -NO2. These compounds are suitable for the preparation of stationary phases for the …
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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 December 18, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 18, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 18, 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.