Stretching of staple fibres
CA 2064817 C · Owner: Commonwealth Scientific And Industrial Research Organisation · Inventors: Warner, John James; Phillips, David Graham
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for stretching an assembly, e.g. a sliver or roving of untwisted , staple fibres (12) to reduce their diameter and increase their length employs false twist to provide grip between the fibres to ensure that stretching of the fibres and not drafting of the assembly occurs. The fibres are first plasticized by treatment with a suitable agent, in a bath (16) and then passed through apparatus which employs a number of rotatable arrays (24 25, 29, 32) of , driven pulleys (26, 33). The arrays are mounted for rotation between two twist blocking nips (18; 18') and are rotatable about a longitudinal axis corresponding to the direction of travel of the assembly through the apparatus to …
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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 August 16, 1990 and granted November 14, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 16, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 16, 2012.
- 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.