Clear silicone waterbased elastomers
CA 2082749 A1 · Owner: Shephard, Nick E. · Inventors: Craig, Brian E.; Shephard, Nick E.; Lyon, Gloria J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Aqueous silicone emulsions which dry to a clear elastomer comprise emulsions which contain 100 parts by weight of crosslinked polydiorganosiloxane in the form of a dispersed phase with less than 10 percent of the dispersed phase particles having a particle size greater than 1000 nanometers and from 0.7 to 2.0 parts of a surfactant of the formula RSO4M, where R is a hydrocarbon radical of from 6 to 20 carbon atoms and M is selected from the group consisting of alkali metal cations and ammonium derivatives. A preferred method of crosslinking is by the use of an alkoxysilane and tin catalyst. The emulsion can be reinforced by addition of colloidal silica dispersions fumed, silica and …
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 12, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 12, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 12, 2014.
- 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.