Heat sealable plastic film
CA 2085946 A1 · Owner: Terbrack, Ulrich · Inventors: Terbrack, Ulrich; Siol, Werner
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to heat-sealable plastic films PF with at least two-phased structure in the thickness range up to 400 µm that are suitable for tightly sealing plastic comprising, a) a high molecular weight or crosslinked polymer P with a molecular weight Mw greater than 50,000 and a glass transition temperature Tg below 10°C; and, b) a copolymer CP with a glass transition temperature Tg above 20°C made up of, .alpha.) 0-85 wt.% methyl methacrylate .beta.) 0-100 wt. ethyl methacrylate, .gamma.) 0-100 wt. cyclohexyl methacrylate cyclopentyl methacrylate, or a mixture thereof;, .delta.) 0-20 wt.% of a monomer copolymerizable with the monomers .alpha.)-.gamma.), and different from them …
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 December 21, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 21, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 21, 2014.
- 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.