Stable mixtures of colloidal silica and a film-forming polymer
CA 2106004 C · Owner: Griffin, Elizabeth Rose · Inventors: Griffin, Elizabeth Rose; Roberts, William Owen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Binder compositions are disclosed that include silica aquasols which have silica that is metal-modified to include a monolayer or less of a metal such as aluminium tin, zinc or lead, and deionized , to a pH of 2.5-7.0 and a water soluble polymer such as poly(vinyl alcohol). An adhesive that includes a silica aquasol an oxygen-, moiety containing polymer, and clay the surface of the, silica being modified to include a metal and the silica aquasol being , deionized to a pH of 2.5 to 7.
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 March 12, 1992 and granted December 17, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 12, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 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.