A projection screen (10) includes a plurality of asperities (14) extending from a substrate, the asperities having faces oriented in a plurality of directions. A photosensitive material is disposed preferentially on the faces so that a differing amount of photosensitive material is present on faces oriented generally toward a projector direction (16) relative to faces oriented generally away from the projector direction (18).

A wellbore screen includes a base pipe including a wall, an inner bore surface and an outer surface, an opening formed through the base pipe wall and a filter cartridge mounted in the opening. In one aspect, the wellbore screen includes an impermeable layer relative to the opening and the impermeable layer may be selected to be substantially impermeable when in a closed position in the opening to passage of fluids through the opening and, the impermeable layer is at least one of (i) selectively ...

A transmission screen having a writable and erasable surface for one side is provided. This transmission screen is constructed so that the writable and erasable surface should have a specular gloss (JIS K5600-4-7:1999) of 70 to 135%, the transmission screen as a whole should have a haze (JIS K7136:2000) of 80% or more, and the surface opposite to the writable and erasable surface should have a specular gloss (JIS K5600-4-7:1999) of 10% or less. With this transmission screen, writing with a marke...

A well screen (10) is proposed having an outer standoff layer (14) between the protective screen (15) and the filter medium (13). A method of making the well screen (10) is also proposed, comprising a step of pulling an open-ended cylinder of filter medium (13) over underlying layers (12) in the well screen (10). Furthermore, a method is proposed using series resistance welding for sealing seams in the layers making up the well screen (10).

Embodiments of synchronizing modification of an optical characteristic of a screen are disclosed.

A screen assembly is disclosed including a case, a screen assembly, and a bracket assembly that supports the screen assembly within an interior region of the case.

A device (10) for sieving and/or mixing is disclosed which includes a base (12) and a container (13) mounted thereon for rotation about an axis which is substantially horizontal. The container has a peripheral wall (14) extending angularly about and longitudinally relative to the axis, and an opening (25) extending longitudinally relative to the axis to provide for movement of material into and out of said space. Means to drive the container angularly about the axis are provided so that any mate...

A method and apparatus for altering the reflectivity of a screen when light is supplied to a portion of the screen is disclosed. The orientation and shape of wires disposed on at least one bar of the screen is controlled to alter the reflectivity of the screen. Also provided is a method and apparatus for supporting a screen on a surface such as a wall, including placing slots within the screen for mating with connecting members mounted on a support frame connected to the surface.

A screen mask includes a screen mesh with a tensioning force of 196 to 392 N/mm; a tension mesh with a tensioning force of 49 to 98 N/mm; a resin plate (fixing part) arranged so as to surround the outer periphery of the screen mesh for fixing a part of the tension mesh with a tensioning force of 392 to 980 N/mm; and a screen frame. A length Ls of the screen mesh in a first direction intersecting a direction in which a squeegee squeegees on the screen mesh when performing a screen printing is 0.6...

The invention is a focusing screen with an integral split image rangefinder located substantially away from the geometric center of the focusing screen. Such an arrangement improves photographic image acuity and it encourages better photographic composition.