Abstract: A downhole filter tool is placed in a wellbore for separating gas from a solution containing both gas and water in a subterranean hydrocarbon bearing formation. The filter tool includes a filter bag inserted inside a perforated inner tube that is surrounded by a casing. The filter bag comprises a layer of hydrophobic material that allows gas to be separated from the water.

Abstract: A modular screening panel in which the apertures in the screening surface extend through the surface and the shape of the aperture parallel the plane of the panel surface varies with the depth of the aperture so that as the surface wears the visible shape of the aperture changes. The apertures can be any convenient shape at the surface but at the depth which means the worn panel needs replacing the shape is distinctly different to the shape of the apertures in a new or partly worn panel.

Abstract: A screen panel with wear protective apertures for mining and quarrying industries adapted to be mounted on a screen deck, including a screening surface made up of materials such as herein described formed on a reinforcing frame, said screening surface having suitably designed apertures of desired shape for allowing materials of desired size to pass through, said apertures having walls made of abrasion resistant material such as herein described said walls having plurality of slits(1) cut along the vertical as well as horizontal line in the top and bottom portion of the apertural walls, whereby utmost flexibility of the apertures is ensured simultaneously ensuring wear protection.

Abstract: A microwave source is used in conjunction with a waveguide and microwave window aperture to direct controlled microwave energy into the housing of a filter. The microwave energy will heat and vaporize any fluid present on the filter material, preventing the filter from “wetting” and becoming unusable.

Abstract: The present invention provides a screen system (8) suitable for use in a vibratory screen apparatus (1), and comprising: a screen element (11) and a support frame (12) therefor, as well as novel screen elements (11) and mesh panels (19) therefor, and the use thereof. The screen element (11) consists essentially of a mesh panel (19) provided with first and second elongate support members (22, 23) extending along opposite end portions of the mesh panel (19). The support frame (12) has spaced apart first and second elongate frame elements (13, 14) for engagement with the screen element support members (22, 23) and further elongate frame elements (17, 18) extending there between for supporting the mesh panel (19).

Abstract: A vibratory screening machine having opposite sides with a plurality of stationary aligned tensioning members mounted on one side and a plurality of nut actuated movable tensioning members mounted on the opposite side and a vibratory screening screen mounted on the stationary and movable tensioning members. The tensioning members have upstanding fingers which are received in apertures in the plates of the vibratory screen, and the edge portions of the vibratory screen include screening material which extends all of the way to the extreme edges of the supporting plate and the fingers are below the screening material. Also, the tensioning structure is mounted on the side walls of the vibratory screening machine below the vibratory screen.

Abstract: A method of plugging an area of damaged mesh in a sifting screen. The method is applicable to screens in which woven wire mesh is stretched, tensioned and secured over a supporting frame containing a plurality of windows and in which local damage to the mesh is in an area of the mesh which overlies one of the windows. The method has the steps of inserting into the window a device which is a close fit therein, and securing the device in the window so as to completely cover the area of damaged mesh. The device may be a former having stretched thereacross and secured thereto mesh similar to that stretched across the window in question, or simply a plate or block. The device may be secured in place by a force or interference fit, mechanical means, or adhesive, or the device may be resiliently deformable to allow it to be pushed past a projection in the window, so as to snap fit the device in place.

Abstract: The invention relates to a sieve frame for plan sifters and also to a method of producing it. It is used mainly in plan sifters for milling. The object is to improve the functionality of an insertable sieve frame and to simplify production.

Abstract: A screen is disclosed which, in certain aspects, has screening material between opposed frame sides and one or more lower strips beneath the screen. In one aspect these strips are only inteconnected via their ends and not along their lengths. In certain aspects, a plurality of lower strips are bonded to the screen and extend across the screen from one frame side to the other. In one aspect one or more of the strips has one, two, or more humps or ridges corresponding to one or more corrugations in a corrugated perforated plate and/or corrugated screen assembly which is on the plate or, with no plate present, on the strips. In another aspect instead of the strips a solid corrugated perforated plate is used. In one aspect openings or perforations through the plate are triangular. In one aspect the screen is undulating screening material and lower portions of the screening material are bonded to a plate or to strips. Optionally screen mounting hooks or frame edges or screen edges may be used with such screens.

Abstract: A vibrating screen apparatus includes a frame and a screen having a first end coupled to an anchor beam which is rigidly coupled to the frame. The apparatus also includes a tension control assembly coupled to a second end of the screen for tensioning the screen to substantially a predetermined tension. The tension control assembly is rotatably coupled to the frame spaced apart from the anchor beam. The tension control assembly changes the tension of the screen upon rotation of the tension control assembly relative to the frame about an axis of rotation. The apparatus further includes an adjusting mechanism for moving the tension plate in a direction normal to the axis of rotation of the tension plate to compensate for nonuniform tension of the screen.

Abstract: A lock mechanism for use with a screen having a generally square or rectangular configuration and elongated hooks or flanges along two opposed side edges thereof, and rails which extend along and engage the hooks. The lock mechanism comprises at least one arm and a crank. The arm has an outer end coupled to a rail and an inner end pivotably connected to the crank. The crank is rotatable about an axis and it is pivotably connected to the arm on an axis which is spaced from the axis of rotation. Rotation of the crank in one direction causes the arm to be extended outwardly and stretch the screen; rotation of the crank in the other direction retracts the arm and relaxes the screen. A lock is provided between the arm and the crank to hold the arm extended, and a spring is preferably provided between the arm and the associated rail. Preferably a second arm, connected similarly to the first mentioned arm, connects the crank with the other rail.

Abstract: A vibratory screening apparatus for removing suspended solids from liquid comprising a first mesh screen having openings with first and second dimensions for receiving the suspended solids thereon, a second mesh screen in superimposed abutment with the first screen and having openings with a third and fourth dimension perpendicular to the first screen openings, the third dimensions being larger than the first dimension and the fourth dimension being smaller than the second dimension of the first screen openings, and a vibratory source coupled to the abutting screens for vibrating the screens whereby the openings of the second screen effectively prevent suspended solids from becoming lodged in the openings of the first screen.

Abstract: One end portion of a wire net is fixedly secured to a fixed holder on a base frame of a sieving machine provided with a vibration device, the other end portion thereof is fixedly secured to a movable holder that is provided on the base frame so as to be freely movable, this movable holder is biased in the direction of separating the movable holder from the fixed holder by means of a spring provided on the base frame, and also, on the base frame is provided a hydraulic device which moves the movable holder in the direction of approaching to the fixed holder against the resilient force of the spring. During operation of this sieving machine, in orer to clear blocking of the meshes of the wire net, the hydraulic device is actuated only when the particles of raw material which caused the blocking are shaken off by relaxing the wire net and broadening the distance between adjacent wires in the wire net.

Abstract: The invention provides a screening arrangement including a screen deck constituted by a non-stretchable, flexible screen cloth material defining a feed end and a discharge end. The feed end and discharge end are secured to mounting formations associated with a frame and the association is such that in use the screen deck may be reciprocated between a taut state and a slack state. The screen deck is located at an angle to the horizontal sloping downwardly from the feed end to the discharge end. The arrangement of the present invention has a high resistance against blinding of the screen deck.

Abstract: A vibratory screening apparatus has a pair of screen cloths in close face to face abutment with the wires of the lower screen cloth generally intersecting the openings of the upper screen cloth to prevent "blinding" of the upper screen cloth by reason of the tendency of the wires of the lower screen cloth to prevent engagement of particles in the upper screen cloth of a size which would tend to clog the openings of the upper screen cloth. The mesh size of the lower screen cloth may be equal to the mesh size of the upper screen cloth or slightly larger than the upper screen cloth openings up to about 50 per cent larger. The superposed screen cloths may rest upon a much coarser mesh screen which serves merely as a structural support for the screen cloths and does not perform a screening function.