Paper chad and fuzz removal means for a rotary punch wheel associated with a complementary rotary female die wheel, the female die wheel having an open annular discharge slot in one side thereof communicating with its punch bores, a stationary chad collector ring or manifold having an open annular slot in one side thereof in registry with the annular slot in the female die wheel to form a joint chamber therewith for receiving chad, and a source of vacuum communicating with the joint chamber for ...

A diffusion media and a process for its fabrication are provided for addressing issues related to water management in electrochemical cells and other devices employing the diffusion media. In accordance with one embodiment of the present invention, a process for fabricating a diffusion media is provided. A diffusion media substrate is provided comprising a porous fibrous matrix defining first and second major faces. The substrate comprises an amount of carbonaceous material sufficient to render ...

The present invention is directed to a method of producing an improved reverse osmosis membrane that shows surprisingly improved solute rejection and permeation properties. The membrane includes a separating layer of a polyamideurea formed in situ by reaction of isocyanate-substituted acyl chloride and a diamine-treated microporous substrate.

Supported thin film membranes of polyurethane, polyurea/urethane, polyurea/polyurethane alloy blends are prepared by depositing a solution of the appropriate polymer on a microporous hydrophobic support. The solution wets but does not soak through the hydrophobic support because the amounts and ratios of solvents and surfactant used to produce the solution have been adjusted to produce a solution having optimum coating properties (for example, surface tension, solvency, viscosity). The solvent o...

A process is provided for for cationically charge modifying a microporous filter membrane, wherein the membrane is a substantially symmetrical isotropic, hydrophilic, organic polymeric microporous filter membrane, preferably nylon, having a microstructure throughout the membrane. The process comprises bonding a primary charge modifying amount of a water soluble cationic charge modifying agent to substantially all of the membrane microstructure, without substantial pore size reduction or pore blo...

A frequency discriminator circuit comprising means for providing a signal of which the phase is varied with the frequency of an input signal, means for generating two signals by the use of vectorial sums of said signal having the phase thereof varied and said input signal, and means for comparing the amplitude of each of said two vectorial signals and that of a reference signal which is proportional to the amplitude of said input signal and detecting that one of said two signals which has a grea...

The present invention relates to a method of making a polymeric porous separation membrane for a lithium ion polymer battery, the method comprising: providing a porous polyolefin membrane and a polymer solution of the concentration of 1 20 weight % in an organic solvent fabricated by dissolving in an organic solvent a polymer compound that is stable in an electrolyte containing a lithium salt and can be gelled in the electrolyte, at the temperature of 10 40.degree. C.; and fabricating a polymeri...

The process of making poromeric materials which comprises impregnating webs of fibrous material with aqueous liquids containing olefinically unsaturated monomers which can be polymerized using redox catalysts, and, if desired, high polymeric plastics in dissolved, emulsified or dispersed form, freezing the webs of fibrous materials impregnated with the aqueous liquids, polymerizing the monomers using redox catalysts and thawing out and separating out the water and any residual monomer from the r...

This disclosure describes a process for producing vapor transmissible polymer coated textile fabrics, and, in addition, vapor transmissible water resistant fabrics. The vapor transmissible textile fabrics are prepared by applying to the fabric a composition comprising a polymer compound having particular film stiffening temperatures and a wax, and thereafter heating the fabric and the composition to a temperature of at least about 150.degree.C. to volatilize some of the wax. The preparation of t...

A semi-permeable membrane containing a catalyst for conversion of hydrogen peroxide introduced from one side of the semi-permeable membrane to molecular oxygen which is released from the opposite side of the semi-permeable membrane. The catalyst is preferably in the form of a ruthenium oxide or sulfide and preferably in assymetrical distribution in the membrane.