Organo(poly)siloxanes containing terminal siloxane units having organyloxy and hydrogen groups
CA 2081447 C · Owner: Staiger, Gerhard · Inventors: Braun, Rudolf; Absmaier, Petra; Brennenstuhl, Werner
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Organo(poly)siloxanes with siloxane units at the end of the chain having organyloxy and hydrogen groups are disclosed as, well as a process for producing the same by reacting .alpha. w-dihydroxyorgano(poly)siloxanes with silanes having a group that can be easily separated and their use in oxgano(poly)siloxane mixtures that can be stocked in the absence of water but which can be cross-linked into elastomers, with alcohol separation, already at ambient temperature, when water is added. A process is also disclosed for producing organopolysiloxane elastomers by cross-linking cross-linkable mixtures by addition of Si-linked hydrogen to SiC-linked residues with aliphatic carbon-carbon multiple …
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 April 25, 1991 and granted August 19, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 25, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 25, 2013.
- 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.