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AssigneeWestern Electric Company, Inc.
InventorsMaheshkumar Parmananddas Valia, William Charles Vesperman
Estimating the term…
A retractile cord of a telephone handset having individually insulated conductors is jacketed with an extrudable flexible clear flame retardant composition which includes a polyvinyl chloride resin (PVC). A phthalate plasticizer is included to impart low temperature properties to the composition while a phosphate plasticizer is used for flame retardancy and a polymeric plasticizer for resistance to extraction of constituents of the composition by oils encountered during use. The composition also includes a metallic stabilizer, a lubricant, an ultraviolet light absorber, an epoxy resin and epoxidized plasticizing stabilizer. The extruded composition is characterized by excellent clarity as well as superior low temperature, flame-retardant and lacquer-mar properties. Equally important is the outstanding resiliency of strand material covered with the composition and wound into a helical configuration with a plurality of convolutions.
An elongated material provided with covering of a clear flame retardant composition which includes a polymeric material consisting essentially of at least 80 percent, by weight of polyvinyl chloride;
A method of making a strand material covered with a clear flame-retardant composition, which includes the steps of:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Protection against damage caused by extremes of temperature or by flame: using material resistant to flame
Use of inorganic substances as compounding ingredients: phosphorus-containing compounds
Oxygen-containing compounds: aldehydes; Ketones
Oxygen-containing compounds: carboxylic acids; Metal salts thereof; Anhydrides thereof
Term ended 2 Mar 1993 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
1. Field of the Invention
This invention relates to strand material covered with a clear flame retardant composition and methods of making same and, more particularly, to telephone cordage jacketed with an extrudable clear flame retardant polyvinyl chloride composition having retractile properties and having protection against degradation by ultraviolet or diffused light while providing stability during manufacture as well as during customer use and methods of making.
2. Description of the Prior Art