Silicone sealants having reduced color
CA 2001026 C · Owner: Lower, Loren D. · Inventors: Lower, Loren D.; Klosowski, Jerome M.; Kamis, Russell P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A chelated titanium catalyst can be improved by the addition of an additive selected from the group consisting of organomercaptans of the formula RSH where R is, a hydrocarbon radical containing from 3 to 12 carbon atoms and mercapto containing silanes of the formula HSR'SiX3 where, R~ is a divalent hydrocarbon radical having from 1 to 8 carbon atoms and X is an alkoxy radical having 1 to 6 carbon atoms. The improved composition has a reduced tendency to develop color upon storage. The improved composition is particularly useful in a silicone composition comprising a hydroxyl endblocked polydiorganosiloxane and an alkoxysilane or mixture of alkoxysilanes or in a silicone composition …
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 October 19, 1989 and granted December 7, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 19, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 19, 2011.
- 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.