E.i. Dupont De Nemours and Company

Dupont Safety & Construction, Inc.

Depuy Du Pont Orthopaedics

Joseph D Trentacosta

Reiyao H Zhu

Vivek Kapur

Dennis A Nollen

Dale L Murschell

Anthony R Saracino

Christine M Kaufmann

Kenneth Wayne Leffew

Bryan Benedict Sauer

Kalika Ranjan Samant

Minshon J Chiou

Mark Theodore Aronson

William Charles Walker

Paul Douglas Stull

David C Kelman

Michael W Cobb

Sharlene Renee Williams

Justin W Chan

John D Anthony, Jr

Andrew Tadros

Peter A Brown

James C Davis

ALbert Terzian

Alicia Marie Castagna

Mark Gary Weinberg

This invention relates to a yarn, and a process for making the yarn, the yarn comprising a plurality of spun filaments having a distinct, continuous, uniform-density sheath of a first polymer surrounding a distinct, continuous core of a second polymer; the first polymer further having a thermal decomposition temperature at least 50 degrees Celsius lower than the thermal decomposition temperature of the second polymer.

Yarn from polymers having different decomposition temperatures and process for forming same

This invention relates to a method of making a helmet using a preform subassembly with arms which have an area that matches a perimeter profile of a specified geometric shape. By use of the area matching perform with arms, the thickness of the helmet is more uniform, seams in the preform can be minimized, and the ballistic resistance of the resulting helmet can be increased.

Method of making a helmet

A layered adaptive membrane structure that has movable membranes is provided. The structure can change its gas, liquid and/or particulate permeability in response to surrounding environmental conditions. Applications include protective apparel that is comfortable to wear wherein the level of protection provided is based on conditions in the environment. Hence, the protective apparel is highly breathable and comfortable in a non-hazardous environment but impermeable or only semipermeable in a hazardous environment.

Layered adaptive membrane structure

Porous adaptive membrane structures having movable membranes are provided. The structures can be made to change their gas, liquid and/or particulate permeability in response to surrounding environmental conditions. Applications includes protective apparel that is comfortable to wear wherein the level of protection provided is based on conditions in the environment. Hence, the protective apparel is highly breathable and comfortable in a non-hazardous environment but impermeable or only semipermeable in a hazardous environment.

Fail-closed adaptive membrane structure

An adaptive membrane structure is provided. The adaptive membrane structure has movable membranes that can be made to change its gas, liquid or particulate permeability in response to surrounding environmental conditions. Such adaptive membrane structures can be used to provide protective apparel that is comfortable to wear wherein the level of protection provided is based on conditions in the environment. The adaptive membrane structures can be used to provide protective enclosures.

Adaptive membrane structure

The present invention relates to a multilayer protective enclosure for protecting humans, animals or perishables from hazardous agents in the environment. The enclosure contains a porous adaptive membrane structure that has movable membranes with insertable protrusions. The structure can be made to change its gas, liquid or particulate permeability in response to surrounding environmental conditions. Hence, the enclosure is highly breathable in a non-hazardous environment but impermeable or only semipermeable in a hazardous environment.

Adaptive membrane structure with insertable protrusions

A process of treating a woven fabric by applying to the fabric a viscous polymer in a 5 to 40 wt % solution with a solvent, wherein the polymer has a Tin the range of about minus 40 to about 0&#xb0; C. and a zero shear melt viscosity of about 2&#xd7;10to about 10poise when measured at 20&#xb0; C. and then evaporating the solvent such that the polymer only partially penetrates the fabric and penetrates to in and between fiber bundles before the polymer solidifies.

Method for treating fabric with viscous liquid polymers

The present invention relates to a porous adaptive membrane structure that has movable membranes. The structure can be made to change its gas, liquid or particulate permeability in response to surrounding environmental conditions. The application of this invention is includes protective apparel that is comfortable to wear wherein the level of protection provided is based on conditions in the environment. Hence, the protective apparel is highly breathable and comfortable in a non-hazardous environment but impermeable or only semipermeable in a hazardous environment.

A fibrous structure made from a fiber and about 1 to about 15 wt % of a high viscosity polymer that has a glass transition temperature of about minus 40 to about 0&#xb0; C. and useful for making bullet resistant articles.

Polymeric additives for enhancement of ballistic performance in fibrous structures

Metal/Composite hybrid orthopedic implants are disclosed that are useful prosthetic devices. The hybrid implant comprises an intraosseous metal portion and an intraosseous composite portion. The composite portion is comprised of filaments nonlinearly disposed to produce a structure of variable modulus along its length. Also disclosed are a variety of means to secure the metal portion to the composite portion. The method of making the various implants is also disclosed.

Metal/composite hybrid orthopedic implants

A process for fabricating panels of a core material with thermoplastic resin facings. The core material is either foam or a honeycomb structure from aramid paper. A belt press machine provides a means for rapid heating and cooling such that the core will not degrade. Since the process is so rapid, aramid fibers can be used to reinforce the resin facings without deleterious decomposition of the fibers under the temperatures used to heat the panels during forming.

Method for forming structural panels having a core with thermoplastic

Method for forming structural panels having a foam core with

Novel composite orthopedic devices with modulus variations are disclosed. The device contains an extraosseous portion attached to a first intraosseous portion which is secured to a second intraosseous portion; the intraosseous portions may interface with the intramedullary canal of the human femur. The modulus varies along the length of the device, decreasing from the extraosseous portion to the second intraosseous portion. The variations in modulus are achieved by forming the device from a composite comprising filaments nonlinearly disposed about the longitudinal axes of the device and within a polymer matrix. The method of making the present orthopedic device is also disclosed.

Composite orthopedic implant with modulus variations

A panel comprising a core member in the form of a honeycomb structure of aramid paper and thermoplastic resin sheet material reinforced with a fiber selected from the group consisting of aramid, carbon and glass bonded to both sides of said core member to form facings therefor.

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Wilmington, DE, United States of America

Joseph D Trentacosta