Abstract: A shaker screen for attachment to a bed of a shaker includes a screen frame having at least one mesh screen attached to the top side of the screen frame, wherein the screen frame is preferentially bowed prior to attaching the mesh screen to the screen frame.

Abstract: A shaker screen for attachment to a bed of a shaker includes a screen frame having at least one mesh screen attached to the top side of the screen frame, wherein the screen frame is preferentially bowed prior to attaching the mesh screen to the screen frame.

Abstract: A shaker screen for attachment to a bed of a shaker includes a screen frame having at least one mesh screen attached to the top side of the screen frame, wherein the screen frame is preferentially bowed prior to attaching the mesh screen to the screen frame.

Abstract: A filter screen to be used in conjunction with a shale shaker in removing solid matter from drilling fluids includes a filter plate having a plurality of perforations, a plurality of hold-down apertures, and a pair of end caps attached to the filter plate, wherein each end cap is configured to isolate the hold down apertures from the plurality of perforations.

Abstract: A filter screen to be used in conjunction with a shale shaker in removing solid matter from drilling fluids includes a filter plate having a plurality of perforations, a plurality of hold-down apertures, and a pair of end caps attached to the filter plate, wherein each end cap is configured to isolate the hold down apertures from the plurality of perforations.

Abstract: A filter screen to be used in conjunction with a shale shaker in removing solid matter from drilling fluids includes a filter plate having a plurality of perforations, a plurality of hold-down apertures, and a pair of end caps attached to the filter plate, wherein each end cap is configured to isolate the hold down apertures from the plurality of perforations.

Abstract: Abstract: A shaker screen for attachment to a bed of a shaker includes a screen frame having at least one mesh screen attached to the top side of the screen frame, wherein the screen frame is preferentially bowed prior to attaching the mesh screen to the screen frame.

Abstract: A screen assembly that is sufficiently flexible to adapt to a non-planar profile of a crowned deck on a vibrating shaker. When attached to the crowned deck, the screen assembly provides a screen with less curvature than the crowned deck.

Abstract: A screen assembly that is sufficiently flexible to adapt to a non-planar profile of a crowned deck on a vibrating shaker. When attached to the crowned deck, the screen assembly provides a screen with less curvature than the crowned deck.

Abstract: A screen assembly that is sufficiently flexible to adapt to a non-planar profile of a crowned deck on a vibrating shaker. When attached to the crowned deck, the screen assembly provides a screen with less curvature than the crowned deck.

Abstract: An apparatus for applying a liquid to a surface comprising an applicator and a body member. The applicator is secured to an end of the body member, the body member defining a reservoir for housing a fluid. The body member includes a piston member for exerting a force on the fluid in the reservoir, and two channels, a first channel being in fluid communication with a channel in the applicator and a second channel being in fluid communication with an area outside the body member. The body member further including a valve for allowing fluid communication between the reservoir and either the first channel or second channel. An additional one-way valve which can be manually deactivated may be included in the second channel.