Curable filled polysiloxane compositions
CA 2010239 C · Owner: Leempoel, Patrick · Inventors: Leempoel, Patrick
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The specification describes and claims curable polysiloxane compositions filled with a mixture of two types of finely divided calcium carbonate. The curable polysiloxane comprises 100 parts by weight of a hydroxypolysiloxane with from 5 to 12 parts by weight of a curing agent therefor comprising a silane of the formula, R a R'b Si or a siloxane having units R a R'c SiO wherein, each R represents a monovalent hydrocarbon group each R', presents an hydroxy, alkoxy, or alkoxyalkoxy group a + b, = 4, a has a value 0 or 1, b has a value 3 or 4 c has a, value 1, 2 or 3, and a + c is not greater than 3 as exemplified by methyl trimethoxy silane together with a, catalytic amount of a titanium or …
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 February 16, 1990 and granted July 20, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 16, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 16, 2012.
- 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.