A process for low temperature heat sealing of polyethylene
CA 2180809 C · Owner: Eastman Chemical Company · Inventors: Gillespie, Bruce Alexander; Foster, Bruce William; Edwards, Ray
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process of producing a heat sealed extrusion coated polyethylene article is disclosed. This process entails heat sealing, at a temperature below 95°C two, opposing extrusion coated polyethylene laminate surf aces thereby welding the surfaces to effect a heat seal. The polyethylene has a narrow molecular weight distribution a low melt index, a low swell ratio, and a polydispersity index below 5.
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 July 9, 1996 and granted April 6, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 9, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 9, 2018.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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.