E.i. Dupont De Nemours and Company

Samuel E Moore, Sr

Jacob Lahijani

Henry Kobsa

Paul E Moran, Jr

The invention provides a spinnerette assembly for multicomponent hollow fibers of the sheath/core type in which the channel for supplying the sheath material is located at a distance from the extrusion orifice of the spinnerette of no more than one-half of the width of the extrusion orifice. The spinnerette ensures uniform supply of the sheath material to the hollow fiber.

Apparatus for spinning multicomponent hollow fibers

A laser cutting method for complex capillaries wherein a multi-mode beam from a solid-state is reduced to predominantly a single mode and focused to a spot about 40 microns in diameter. The laser is focused about 0.2 to 0.3 mm above the work piece. The predominantly single mode is a TEMoo mode. By recutting the capillary slots with the laser, metal oxide particles condensed from the vapor phase and resolidified molten metal on the walls of the slots are removed.

Method for laser cutting metal plates

Brittle fibers such as ceramic or carbon fibers are protected by a shroud of thermoplastic material surrounding the core. Such enshrouded yarns facilitate formation of fiber preforms used in the preparation of composite materials.

Protected brittle fiber yarns

An electrode for use with electric discharge machining in forming a complex spinneret orifice having concentric annular passages is made of a plurality of concentric male segments formed to correspond to the configuration of the passages.

Growing community of inventors

Claymont, DE, United States of America

Samuel E Moore, Sr