Polyimidesiloxane solution and method of coating substrates
CA 2120272 A1 · Owner: Rojstaczer, Sergio · Inventors: Tyrell, John A.; Rojstaczer, Sergio; Tang, David Y.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, Disclosed is a solution which comprises (a) a substantially fully imidized polyimidesiloxane; and, (b) a solvent which comprises at least 50 wt% of a substituted pyrrolidone having the general formula where R is aliphatic or cycloaliphatic from C3 to C10. Also disclosed is a method of forming a coating on a substrate by applying the solution to the substrate and evaporating the solvent. Coatings formed from this solution are not subject to whitening as are coatings formed from the same polymers in other solvents.
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 30, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 30, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 30, 2016.
- 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.