Zip fasteners made of polyester monofilaments
CA 1056569 A · Owner: Teijin Limited · Inventors: Kawase, Shoji; Kuratsuji, Takatoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A monofilament for use in a zip fastener characterized in that said monofilament has a denier size of 200 to 20,000 an intrinsic viscosity of, 0,35 to 3.5 a circularity of not more than 1.01 and is composed of a polymethylene terephthalate containing at least 85 mole % of trimethylene terephthalate, tetramethylene terephthalate or hexamethylene terephthalate as a recurring unit. The monofilament is prepared by melt-extruding the polymethylene terephthalate in the form of a filament passing the extruded, filament through an air gap passing it through a cooling bath of an inert quenching liquid held at a temperature of about 60 to 100°C. then passing it through a cooling zone at a temperature …
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
- Granted June 19, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 19, 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.