Rockwell International Corporation

Louis Maus

Leslie F Warren, Jr

Edward F Witucki

William P Manning

William F Hall

Dean S Klivans

Donald D Haley

An attenuator of electromagnetic radiation, such as radar, is described wherein a single attenuator sheet in the nature of 'spacecloth' is placed in front of a plurality of reflective layers wherein each of the reflective layers is tuned to reflect a narrow band of radiation of a selected frequency and transmit other frequencies; and each of the reflective layers is spaced from the attenuation layer at a distance of one-fourth of the wavelength of electromagnetic radiation to which it is tuned. In a preferred embodiment each of the reflective layers comprises elongated narrow conductive areas arranged in spaced apart columns and rows in a generally non-conductive area.

Interference type radiation attenuator

A process for generating electrically conductive patterns on a dielectric substrate, such as an insulating sheet, which comprises applying to preselected areas of the substrate a preselected concentration of an ink in the form of an oxidizing agent, such as a solution of a ferric salt, e.g., ferric chloride or ferric ethylbenzenesulfonate, and which can also contain a suitable binder or thickening agent, to form printed images on the substrate surface. The resulting printed surface of the substrate is then exposed to an excess of reactant, e.g., pyrrole monomer in vapor phase, which reacts with the oxidizing agent to develop conductive images, as by forming polypyrrole, in those printed areas of the substrate containing the oxidizing agent.

Method of printing electrically conductive images on dielectric

Production of electrically conductive composite or structural materials comprising a dielectric substrate, e.g. fiberglass fabric, and a layer of a pyrrole polymer on the substrate, by treating the substrate with a solution of a strong oxidant containing a substantially non-nucleophilic anion, e.g. ferric chloride, drying the substrate and exposing the so treated substrate with the vapors of a pyrrole and oxidizing the pyrrole by the strong oxidant and depositing a polypyrrole layer or film on the substrate.

Process for applying an electrically conducting polymer to a substrate

Electrically conductive composites comprising a dielectric porous substance, e.g. fiberglass fabric, and a pyrrole polymer deposited in the pores of such substance. The composites are produced by contacting the porous substance with an anode in an electrolytic cell containing an electrolyte comprising a pyrrole monomer and a substantially non-nucleophilic anion such as bisulfate, and passing an electric current through the cell, thus electrochemically precipitating a conductive pyrrole polymer in the pores of such substance.

Electrically conductive composites and method of preparation

An interference type radar attenuator is described formed of a plurality of thin sheets having selected admittance values. The sheets are spaced apart by thin plastic spacer members having a shape memory so that the sheets can be compressed together by deforming the plastic spacers for very tight packaging and, upon release of the packaging, the sheets return to a spaced relation for effective radar attenuation. A similar structure is useful in space vehicles for thermal shielding and as a meteroid bumper.

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Camarillo, CA, United States of America

Louis Maus