Sealable films
CA 1296853 C · Owner: Bossaert, Bernard L.L. · Inventors: Ohlsson, Stefan B.; Bossaert, Bernard L.L.; Willems, William F.M.J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A film having superior seal strength and barrier properties comprises a base layer comprising 70 to 97 weight of a polyolefin, e.g. polypropylene, and 3 to 30 % weight of a resin of lower molecular weight than the polyolefin e.g. a hydrogenated petroleum resin. On at least one of the surfaces of the base layer is a 1 to 20 weight % of a film of a random copolymer of 80 to 99 weight % of propylene and 1 to 20 weight % of ethylene, for example an isotactic, propylene-ethylene copolymer
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 March 10, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 10, 2009.
- 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.