The invention relates to a structured surface with ultraphobic properties. Said surface as a surface topography in which the value of the integral of a function S: S(log f)=a(f)f, which gives a relationship between the spatial frequencies f of the individual Fourier components and their amplitudes a(f) is at least 0.5 between the integration limits log (f.sub.1/.mu.m.sup.-1)=-3 and log (f.sub.2/.mu.m.sup.-1)=3. The surface consists of a hydrophobic or oleophobic material or is coated with a hydr...

An extendable surface comprising a plurality of triangular leaves is disclosed. The leaves are arranged one above another and are hingedly mounted at the apex of each leaf for rotational motion between a retracted position in which the leaves are arranged in overlapping relation, to an extended position in which the leaves are adjacent to one another. The leaves have interengaging hooks along their edges which link the leaves together in the extended position and seal the surface, preventing wat...

A projection surface for the viewing of a projected video image or equivalent has a reflective surface of the projection surface. The reflective surface has color elements of at least three colors, arranged side by side on the projection surface so as to cover the entire reflective surface of the projection surface.

The invention relates to hydroaerodynamics and to thermal physics and concerns devices to control the boundary and near wall layers in the flows of continuos media such as gases, liquids, their two-phase or multicomponent mixtures and the like, moving along ducts under no pressure or under pressure.

The present invention provides a surface modifier for an inorganic solid, of which a small amount improves efficiently and significantly the affinity of the inorganic solid with a medium, thus obtaining a composition having no bad effects even if the inorganic solid is blended in a large amount. That is, the present invention provides a surface modifier for an inorganic solid, which comprises a polyether having a monomeric unit represented by the formula (I); a inorganic solid having at least a ...

A surface cleaner wherein abrasive particles are directed against a surface to be cleaned, after which the abrasive particles rebound into the cleaner and return for recirculation. Several features are involved. First there is provided an accelerator for the normally gravity flowing abrasive particles to accelerate the particles towards a throwing wheel wherein the abrasive particles are spread over a greater depth of an associated throwing vane. Some of the abrasive particles will not rebound e...

A casing installation system usable with tubular casing having an upper end portion and a lower portion, for anchoring the upper end portion of the casing on an outer casing string secured to a wellhead having a housing, the wellhead housing being positioned at a fixed position over a well, said casing extending upwardly to the wellhead from a location in the well at which location the lower portion of the casing is landed, the upper end of the casing being terminated by a generally annular casi...

A stripping device for wall coverings such as wallpaper comprising a hand-held casing (1) housing an electric motor, a gearbox (2) driving an output boss (3) on which is mounted a concave cutting blade (4) having a peripheral cutting edge. The gearbox (2) is such as to cause the blade (4) to execute an orbital motion in the general plane of the disc. The device is used by pressing the blade (4) gently against the surface to be stripped whereupon the orbital motion in the plane of the surface cau...

A tool for surface treatment of an optical surface, includes a rigid support having a transverse end surface, an elastically compressible interface which is applied against and overlaps the end surface, and a soft buffer designed to be applied against the optical surface and which is pressed against and overlaps at least partly the interface opposite and perpendicular to the end surface. The buffer includes a so-called central part which is located between the end surface and a so-called periphe...

In one aspect, foreign material on the surface of a substrate is processed to form a reaction product by: providing a directed flow of a fluid, comprising a reactant, to the vicinity of the foreign material to be processed; and delivering an aerosol of at least partially frozen particles continuously or intermittently to the foreign material to aid the reactant react with the foreign material to form the reaction product. In another aspect, foreign material is processed by: providing a directed ...