Polymeric sheet
CA 2111919 A1 · Owner: Imperial Chemical Industries Plc · Inventors: Dawes, Mark Edward; Sankey, Stephen William; Lawrence, Paul David
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Polymeric Sheet, A composite sheet having a thickness in the range from 30 to 400 µm, has an opaque crystalline polyester first layer having a deformation index of greater than or equal to 2.5% and a, transparent crystalline polyester second layer. The first layer preferably contains titanium dioxide. The composite sheet is suitable for use as a replacement for aluminium foil being, particularly useful as a lid for a container.
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 December 20, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 20, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 20, 2015.
- 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.