Polymer films
CA 1062419 A · Owner: Bakelite Xylonite Limited · Inventors: Taylor-Brown, Terence J.; Jack, James
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A stretched polyolefin film having a substantially uniform cellular structure and comprising a crystalline linear polyolefin which film has the, following characteristics:- (1) it comprises no more than 14% by volume of the film of closed cells; (2) it has an apparent density which is 90 to 20% of the density of the starting polyolefin composition;, (3) it has a cell factor equal to or less than + 0.65 which factor may be, zero or negative, (4) it contains 0 to 25% by weight based on the polyolefin of at least one additive selected from fillers and pigments; (5) it has a thickness up to 11 mils;, (6) it comprises cells with dimensions that the average cell colume is not greater than …
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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 September 18, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 18, 1996.
- 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.