Porous plates made by vacuum evaporation of metal at relatively low vacuum levels. Such plates can be removed from the substrate for use. The pores in the porous structure so produced may be enlarged by etching.

Directed to an elongated, coherent and self-supporting object of predetermined contour and cross section composed of a large number of longitudinally extending strands of filamentary thermoplastic devoid of added resinous binder between strands, some of said strands being heat-set or lightly sintered together to provide a plurality of longitudinally extending and interconnected channels of virtually capillary size, the pore volume of the object being between 25 percent and 95 percent of the tota...

This invention is a dynamic pressure sensor of the porous pipe variety for se in sensing the presence of an acoustic energy source in a moving fluid environment. The sensor is especially adaptable to moving vehicle applications wherein the sensor is located on the moving vehicle and boundary layer interference due to movement of the vehicle and the sensor in air are prime considerations.

Porous solids having surface area of at least five square meters per gram are reduced to smaller particle size by explosive fragmentation. Exemplary disclosure concerns aluminosilicate zeolites in extremely finely divided form prepared by detonation of crystalline zeolites having adsorbed therein explosive compounds and compositions. In one particular embodiment, finely divided zeolite catalyst is supplied to the reactants and energy is furnished to the system by detonation of explosive-loaded c...

A porous, breathable, polymer-coated fabric is produced by applying a layer of film-forming flexible polyurethane solution to a carrier member; heating said layer sufficiently to form a solidified film on said carrier member; cooling said film and carrier member; applying a second layer of film-forming polymer solution on the first film on the member; applying to said second layer a fabric material; and heating the resulting structure to form an unitary article comprised of the fabric and both p...

Alloys of intermetallic compounds and solid solutions are prepared as powders, compacted, and sintered at high temperatures to form porous, single phase alloys; the porous alloys are then surface-oxidized such as by anodization to form a mixed metal oxide film on the surfaces of the porous structure. This results in a mixed metal oxide surface film having good dielectric properties. The placement of conductive material in the void space of the porous anode results in the formation of a capacitor...

The method of fabricating spheroid-shaped particles of porous carbon with metal or metallic compound powder dispersed therein, which particles have controlled size, shape and porosity, by dispersing powdered metal or metallic compound material that may comprise fissionable material in precured resin particles, heating the particles in a suspended condition in a fluid medium to spherically shape and cure the particles and then pyrolyzing the cured particles to produce the spheroid-shaped porous c...

This invention provides a porous film useful as a fresh fruit and vegetable wrapping material which is obtained by forming a large number of small recesses in an organic film and which does not allow permeation of water, bacteria, and viruses, but allows permeation of a gas, e.g., the oxygen gas or the carbon dioxide gas, and water vapor. The porous film includes the organic film and the large number of recesses formed in the organic film and having an average opening width of 0.5 .mu.m to 300 ....

An electrode for medical applications is provided with a PtIr coating which is at least partly porous. The coating contains more than 20% iridium by weight and at least 100 ppm Pt. The coated areas of the electrode exhibit an electrochemical capacitance of more than 5 mF/cm.sup.2 in physiological saline solution at 37.degree. C. and a measurement frequency of 100 mHz. A sputter process is suitable for this purpose, in which a porous platinum-iridium layer is deposited on the electrode by simulta...

In one embodiment, an AlInGaP LED includes a bottom n-type layer, an active layer, a top p-type layer, and a thick n-type GaP layer over the top p-type layer. The thick n-type GaP layer is then subjected to an electrochemical etch process that causes the n-type GaP layer to become porous and light-diffusing. Electrical contact is made to the p-GaP layer under the porous n-GaP layer by providing metal-filled vias through the porous layer, or electrical contact is made through non-porous regions o...