Melt-spinning, drawing, relaxing, and winding polyesters
CA 1085119 A · Owner: E.I. Du Pont De Nemours And Company · Inventors: Chantry, William A.; Conrad, Roddy M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process is provided in which a continuous filament polyethylene terephthalate yarn having an HRV in the range of 24 to 28 in heated to a temperature in the range of 75° to 250°C. and drawn to a total denier in the range of 50 to 500 at a draw ratio in the range of 5.2:1 to 6:1 passed over a, draw roll having a temperature in the range of 225° to 250°C. relaxed at a tension in the range of 0.09 to 0.15 gram per denier and would up at a minimum speed of 2,000 yards per minute (1829 meters/minute). The yarns prepared by this process have a tenacity in the range of 7.5 to 9 grams per denier a, load-bearing capacity in the range of 3 to 5 grams per denier at 7% elongation, a maximum dry heat …
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 September 9, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 9, 1997.
- 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.