Multi-layer heat sealable polypropylene films
CA 2010927 C · Owner: Donovan, Kevin Michael · Inventors: Balloni, Riccardo; Keung, Jay Kin; Donovan, Kevin Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A heat-sealable multi-layer film structure charactised by consisting essentially of:, (i) an outer heat sealable layer (A) a core layer, (B), and an outer layer (C) the outer heat sealable layer (A) being coextensively adherent to the upper surface of the core layer (B) and the outer layer (C) being coextensively adherent to the lower surface of the core layer (B), said outer layer (A) being formed from a polymer composition (a) consisting essentially of heat sealable resin compounded with one or more slip additives which are incompatible with polypropylene, (ii) said core layer (B) being derived from a polymer composition (b) consisting essentially of an isotactic polypropylene homopolymer …
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 February 26, 1990 and granted January 16, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 26, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 26, 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.