Elevated temperature dimensionally stable impact modified polyester with low gas permeability
CA 2129447 C · Owner: Lawson Mardon Therma-Plate Corporation · Inventors: Freundlich, Richard A.; Dalgewicz, Edward J. Iii; Bond, John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Polyester composition with improved impact properties improved oxygen , permeability and improved dimensional skrin-kage during heating. Impact modifiers are dissolved into a molten polyester to form a eutectic alloy. On slow cooling the eutectic , alloy of the invention freezes to form a mixture of particles of the impact modifier embedded in a matrix of the polyester. By con-trolling the solidification of the melt the size and distribution of the , precipitates from the melt can be controlled which allows , control of the mechanical properties. The precipitation can also be controlled either by homogenous nucleation or by heterogene-ous nucleation through the addition of a …
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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
- Filed February 3, 1993 and granted April 26, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 3, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 3, 2015.
- 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.