Laminate film for use in vacuum packaging
CA 1069447 A · Owner: W.R. Grace & Co.-Conn. · Inventors: Argela, Gian L.; Austoni, Riccardo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to vacuum packaging. A backing-board laminate having in a substrate layer of irradiated polyethylene oriented polypropylene or oriented polyamide an oxygen-barrier layer of, hydrolysed ethylene-vinyl acetate copolymer and an uppermost layer of a blend of an ethylene-vinyl acetate copolymer with a wax is heat-sealed vacuum-tightly to a thermoformed pouch film laminate the lowermost layer of which is of polyethylene or an ethylene-vinyl acetate copolymer. An ink-spot of e.g. nitrocellulose resin provided between the backing board and pouch films enables the consumer to start to pull open seal. Once the pull is started, the seal opens easily. The easy-open seal …
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
- Granted January 8, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 8, 1997.
- 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.