Poly(silethynylenedisiloxane) and method for the manufacture thereof
CA 2088200 C · Owner: Dow Corning Japan, Ltd. · Inventors: Suzuki, Toshio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Silethynylenedisiloxane polymers are, described with repeating units represented by -R1R2SiC~CSiR3R4OSiR5R6O- where R1-R6 independently represent hydrogen atoms, alkyl groups aryl groups, or, alkenyl groups. The polymers are prepared by reacting a disilylacetylene compound represented by the formula X1R1R2SiC~CSiR3R4X1 and a silane compound represented by the formula X22SiR5R6 where X1 and X2 represent H OH, OM, or a hydrolyzable group. X1 and X2 are not identical and are selected so that they undergo a condensation reaction to form a siloxane bond.
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 January 27, 1993 and granted August 18, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 27, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 27, 2015.
- 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.