Multifunctional vinyl cyclopropane derivatives
CA 2199568 C · Owner: Zeuner, Frank · Inventors: Zeuner, Frank; Moszner, Norbert; Rheinberger, Volker
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Multifunctional polymerizable vinyl cyclopropane derivatives, stereoisomers thereof, and mixtures of such stereoisomers, suitable for use in dental materials. The derivatives are of the following general formula (I) (see formula I) , where R1, R2, R3, R4 X, Y and n independently of one another have the following meanings:, R1 = H, substituted or unsubstituted C1 to C12 alkyl or substituted or unsubstituted C6 to C14 aryl; R2 = n-times substituted C1 to C20 alkylene which can be interrupted by O, S, N or NH, or n-times substituted C6 to C14 arylene; , X = CO CO-O, CO-S, CO-NR3, SO2 or is absent, where R3 = H, C1 to C6 alkyl or C6 to C14 aryl; Y = CO, CO-O, CO-S, CO-NR4 or SO2, , where …
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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 March 10, 1997 and granted February 26, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 10, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 10, 2019.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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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.