Improved plastic bag
CA 2273933 A1 · Owner: Pactiv Corporation · Inventors: Dobreski, David V.; Long, Steve P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention improves performance of the side and/or fin seals (16) of plastic bags through the use of resins that have a narrow molecular weight distribution or polydispersity. The performance of the side seal and/or fin seal of a plastic bag is improved by using body panels (25 26) which comprise , a first resin, and optionally a second resin. The first resin is preferably prepared in the presence of a single site catalyst. The first resin has a polydispersity of from about 1 to about 4 a melt index of from about 0.2 to , about 20 and a melt flow ratio (I20/I2) of from about 12 to about 35. The use of such first resins results in side and fin seals which are stronger …
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 October 22, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 22, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 22, 2019.
- 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.