Polysiloxanes from cross-linkable monomers based on cyclosiloxanes and their use in polymerizable compositions
CA 2355049 A1 · Owner: Guggenberger, Rainer · Inventors: Eckhardt, Gunther; Bissinger, Peter; Guggenberger, Rainer
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to cyclic sol-gel-condensable siloxanes of general formula (1), wherein R1, R2 mean alkyl with 1 to 10 preferably 1 to 5 C-, atoms, alkenyl with 1 to 10 preferably 1 to 5 C-atoms, fluoroalkyl 1 to 10 preferably 1 to 5 C-atoms, cycloalkyl with 3 to 12 preferably 5 to 12 C-, atoms, aryl with 6 to 18 preferably 6 to 12 C-atoms; R3 means H R5-Z, R4 , means R6-(A-R6)c-SiXaR7b; R5 R6 mean alkylene, linear or branched, with 1 to 10, preferably 2 to 6 C-atoms, alkenylene linear or branched with 1 to 10, preferably 2 to 6 C-atoms cycloalkene with 3 to 12, preferably 5 to 8 Catoms, cycloalkenylene with 3 to 12, preferably 5 to 8 C-atoms alkarylene , with 6 to 18, preferably 6 …
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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 22, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 22, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 22, 2021.
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Timeline
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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.