Silicone release compositions
CA 2135115 C · Owner: Parbhoo, Bhukandas · Inventors: Parbhoo, Bhukandas; Hurford, Simon R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A release modifier for silicone release compositions comprising a MQ resin consisting essentially of units of the formulae, SiO2 (Q) and R3SiO1/2 (M), wherein R denotes a monovalent hydrocarbon group having up to 3 carbon atoms, a hydrogen atom, an alkenyl group of the formula -R1CH=CH2 or an oxyalkenyl group of the formula -OR'CH=CH2 wherein R' denotes an alkylene group of from 4 to 12 carbon atoms, provided there is at least one group -R'CH=CH2 or one group -OR'CH=CH2 present per MQ molecule and that no more than 50% of all M units have such groups. Also claimed is a solventless release composition based on siloxanes having SiH groups and a catalyst in addition to the release modifier.
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 November 4, 1994 and granted December 30, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 4, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 4, 2016.
- 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.