Multilayer film
CA 2029959 A1 · Owner: Wall, David · Inventors: Wall, David; Marbrow, Richard Anthony; Berry, Michael Richard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
H 35509, "MULTILAYER FILM", A multilayer film comprises a substrate layer of polymeric material having on a first surface thereof a polyester heat-sealable layer and on a, second surface thereof a thermoset acrylic resin backing layer. The backing layer is preferably a discontinuous coating. The heat-sealable layer is optionally coated with a release layer preferably a polyurethane resin, release layer.
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 14, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 14, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 14, 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.