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Expired Canadian patentCanada

Extruding nozzle for producing non-wovens and method therefor

CA 2277191 C · Owner: Kwok, Kui-Chiu · Inventors: Kwok, Kui-Chiu

CIPO record

Overview

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Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

A parallel plate nozzle for extruding visco-elastic fluidic materials useable in the manufacture of non-woven materials and method therefor , dispenses a, plurality of first and second fluids from a corresponding plurality of first and second, orifices to form first and second adjacent fluid flows. The first fluid flows are drawn, and attenuated by not more than one corresponding second fluid flow at a second, velocity greater than a first velocity of the first fluid flow to form corresponding first, fluid filaments, which are preferably relatively continuous and vacillated chaotically. The first and corresponding second fluid flows are spaced as closely as possible to, maximize …

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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 July 7, 1999 and granted November 19, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 7, 2019.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 7, 2021.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJuly 7, 1999
GrantedNovember 19, 2002
Term endedJuly 7, 2019
Patent numberCA 2277191 C
Classification (IPC)D01D5/09 +1 more

Timeline

Timeline From CIPO dates

2000200220042006200820102012201420162018Application filedJuly 7, 1999Patent grantedNov 19, 2002Term endedJuly 7, 2019

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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.