Asymmetrically quenching, heat-treating, and drawing polyolefin filaments
CA 1051160 A · Owner: James Mackie And Sons Limited · Inventors: Mackie, Gordon; Mcmeekin, Samuel
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to A process for the production of crimped filaments of semi-crystalline polyolefins or blends of polyolefins with other materials by melt spinning wherein at least a proportion of the filaments are rapidly and asymmetrically cooled from the melt are formed, into a tow or tows and subjected to a heat treatment of a least 100°C after which they are then drawn. Provided the extent of the heat treatment is adequate in relation to the nature of the polymer the type and efficiency, of the heating the diameter of the filaments and the thickness of the tow or tows, it is round that n useful crimp of at least 2 crimps per centimetre develops after the filaments sire relaxed. …
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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
- Granted March 27, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 27, 1996.
- 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.