A simplified screen changer is provided which is particularly suitable for the extrusion of synthetic resinous thermoplastics. Screens are supported in a recessed movable plate. The screen on the upstream side is sealed against leakage by means of an extrusion pressure actuated sealing ring. The apparatus is of simple and rugged construction.

A phase type focusing screen has a plurality of minute patterns of a given shape formed by protrudent and/or recessed parts and allocated on a surface of an optically transparent base plate. Assuming that a stepped level difference between a top face of the protrudent part or a bottom face of the recessed part and the surface of the base plate is d, a refractive index of a material of the base plate is n and the shortest wave length within a working wave length region is .lambda., the following ...

A fluorescent screen includes a substrate made of a light-scattering material and a mixture of an organic fluorescent substance and a binder dispersed therein. Since the luminescent light is scattered by the light-scattering material, the light emitted from the screen is increased to a level higher than that of a conventional fluorescent screen to enhance brightness thereof.

Molding, which is attached directly to the outside of a house around a window, includes a continuous groove for receiving the edges of a sheet of flexible screening. A strip of flexible tubular rubber is used to force the screen into the groove and operates to frictionally retain the screen in engagement with the molding, and a decorative cap can then be snap fitted into the groove to further hold the screen in place. A flexible retaining strip may be removably attached to the decorative cap and...

A fireplace screen which is formed of a plurality of translucent panels which can be constructed of any one of a variety of colors with each panel being constructed of a multitude of colors. The observing of the burning of wood or other similar material within the fireplace through the panels produces a most attractive explosion of colors resulting in a most attractive appearance.

A portable pressure screen apparatus is disclosed having a cylindrical shaped pressure housing defining upper and lower hingedly connected halves. The housing includes a slurry inlet aperture raised relative to a filtered slurry discharge port situated at the opposite end of the pressure housing from the slurry inlet aperture. A screen spans the interior of the housing, separating the interior into an upper chamber and a lower chamber. Collected particulate matter from the slurry inlet aperture ...

A camouflage screen consists essentially of a reflective panel held in front of the user in a position upwardly slanted away from him. The panel reflects an image of the surrounding terrain to any distant observer. A loop-hole in the middle of the panel is provided for observation and/or for discharge of a firearm therethrough.

A folding shower screen comprises an attachment channel member (3, 18) adapted to be secured to a wall (2), e.g., at one end of a bath (1) in general co-planar alignment with the outer side (7) of the bath, a hinge (4) disposed at a lower end of the attachment member, a movable channel member (5, 13) secured to the hinge and pivotable between a stowed position alongside the attachment member and a deployed position (as shown) resting along the bath lip (8), and a generally quadrant shaped collap...

A light and vision blocking device structured of a hollow, tubular member having an attached flange for securing the device to a highway median barrier is disclosed. The device is a semi-flexible plastic device suited for impact absorption.

A screen printer which has a cleaning device for cleaning a mask which is formed with at least a hole of a printing pattern. The cleaning device includes a spatula member and an airstream generating device. The spatula member is moved along the surface of the mask in contact therewith so as to scrape ink adhered to the mask surface. The airstream generating device generates an airstream passing through the hole of the mask so as to remove ink within the hole of the mask.