Extrusion methods and apparatus and structures produced therewith
CA 2050155 A1 · Owner: Blemberg, Robert J. · Inventors: Curie, Kevin J.; Nordness, Mark E.; Blemberg, Robert J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Methods and apparatus for reducing the impact of a higher temperature polymeric melt stream element on a lower temperature polymeric melt stream element and vice versa. The methods comprise supercooling the hotter melt stream element, exposing one or more melt stream elements to an undesirable thermal condition for a limited period of time and/or using one or more layers as a heat sink. The apparatus is provided by a modified die in which one of the melt stream elements having the disparate temperatures traverses the die in a foreshortened path in the direction of extrusion of the extrudate.
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 August 28, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 28, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 28, 2013.
- 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.