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:
Apr. 13, 1993
Filed:
Nov. 05, 1991
Franciscus A Lijten, Heveadorp, NL;
Gerrit Ruttenberg, ED Velp, NL;
Akzo N.V., Arnhem, NL;
Abstract
Stiff cords especially useful for reinforcing V-belts are made from yarns formed of extruded filaments. Almost all of the filaments have a core and a complete sheath. The proportion of sheathed filaments, A in percent to all of the sheathed filaments in the yarn, in which the proportion of the sheath in each sheathed filament is (M.+-.0.1) percent of the total volume of the sheathed filament, simultaneously satisfies the conditions A.ltoreq.100; M.gtoreq.0.5; A.gtoreq.30+(0.1 M).sup.8. The sheath is formed of a polymer having a melting point at least 10.degree. C. below the melting point of the polymer forming the core. One such sheathed filament has a core formed of polyethylene terephalate and a sheath formed of a copolymer of polyethylene terephalate and sulfoisophthalic acid.