Patents by Inventor William Amdor Chantry

William Amdor Chantry has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Continuous spin-drawing process for preparing polyethylene terephthalate yarns
    Patent number: 4003974
    Abstract: A process is provided in which a continuous filament polyethylene terephthalate yarn having an HRV in the range of 24 to 28 is heated to a temperature in the range of 75.degree. to 250.degree. 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.degree. to 250.degree. C., relaxed at a tension in the range of 0.09 to 0.15 gram per denier and wound 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 shrinkage of 4% at 177.degree. C. and an elongation at break in the range of 12 to 20%.
    Type: Grant
    Filed: April 4, 1975
    Date of Patent: January 18, 1977
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: William Amdor Chantry, Roddy Merl Conrad