Abstract: The present invention relates to a process for coating reinforcing elements preferably in fiber form, wherein said material is treated, between two electrodes, by the field obtained by means of a direct electric current of voltage included between 50 and 150,000 V and/or by means of an alternating electric current of frequency between 50 and 1,000 Hz and of voltage included between 10,000 and 30,000 V, and said element is placed in contact with a powder of a conductive or semi-conductive material.

Abstract: The present invention relates to a process for coating reinforcing elements preferably in fiber form, wherein said material is treated, between two electrodes, by the field obtained by means of a direct electric current of voltage included between 50 and 150,000 V and/or by means of an alternating electric current of frequency between 50 and 1,000 Hz and of voltage included between 10,000 and 30,000 V, and said element is placed in contact with a powder of a conductive or semi-conductive material.

Abstract: A fluid control apparatus and method for a positive displacement engine or compressor which has a treatment chamber that communicates with a fluid admission duct and an exhaust duct via a port, and contains a piston within the treatment chamber which reciprocates between a top dead center and a bottom dead center position. The piston carries a poppet valve sealing member which is activated to provide substantially perfect sealing between the port and the treatment chamber when the piston is in the immediate vicinity of top dead center position, and is deactivated when the piston is in a position other than the immediate vicinity of the top dead center position in order to allow fluid to pass freely through the port.

Abstract: The present invention relates to a process for the preparation of a composite material wherein the element used to reinforce the composite material is subjected to an electrostatic field induced by a high voltage electric current, said element being then impregnated with a liquid matrix material or precursor of matrix, while still under the influence of said field, and to the composite materials obtained by carrying out said process, notably vulcanized products, in particular vehicle tires, ceramics and electrodes.

Abstract: Process for the preparation of a composite material formed of reinforcing fibers, regularly distributed and oriented in more than two directions, and of a matrix filling up the space between said fibers.According to the invention, said process consists in: producing a convex brush of said reinforcing fibers, regularly distributed and fixed by one of their ends on a convex base, said fibers being subjected to an intensive D.C. electrostatic field, oriented in parallel to said fibers so that the fibers are immobilized in stretched condition perpendicularly to the base surface; inserting between said fibers, layers or grids of fibers, disposed successively at 90.degree. from one another, said insertion being carried out while the reinforcing fibers fixed on said base are subjected to the intensive D.C.

Abstract: The present invention relates to a process for the preparation of a composite material wherein the element used to reinforce the composite material is subjected to an electrostatic field induced by a high voltage electric current, said element being then impregnated with a liquid matrix material or precursor of matrix, while still under the influence of said field, and to the composite materials obtained by carrying out said process.