The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 31, 1977
Filed:
Feb. 26, 1976
David Emerson Bosley, Grifton, NC (US);
E. I. Du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
Yarn of polyester filaments having a random distribution along the filament length of thick and thin sections, which differ in dye uptake, is produced by incompletely drawing a spin-oriented yarn, preferably one prepared by melt-spinning polyethylene terephthalate into yarn while withdrawing the yarn from the spinneret at a take-off speed of 3000 to 4000 yards per minute. The spin-oriented yarn is drawn on a hot draw pin of about 1.3 to 6 cm in diameter, using a draw ratio which is 82 to 95 percent of the draw ratio needed to fully draw the yarn. The incompletely drawn yarn can be false-twist textured under conditions conventionally used for fully drawn polyester yarn. The textured yarn provides attractive dyed fabrics due to darker shades of color in the thick filament sections.