Production of fibre
CA 2296534 A1 · Owner: North, Anthony Grahame · Inventors: Bradley, Paul Jonathan; Brunskill, William; North, Anthony Grahame
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Staple fibre is produced by extruding a solution of a polymer through a spinneret to form continuous filaments gathering the continuous filaments to form a tow and continuously cutting the filaments in a cutter to form staple fibre. At least one jet of gas is blown at the tow before it enters the cutter to reduce smearing of polymer on the cutter. The process is particularly advantageous for treating water-soluble or water-absorbent filaments.
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 July 13, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 13, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 13, 2020.
- 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.