Class 209/274 - Concave and convex sifters

Subclass of Class 209 - Classifying, separating, and assorting solids
Definition: Sifting devices curved concavely or convexly on the surfaces
No. of patents: 27
Last issue date: 10/25/2011

Number	Title	Issue Date
8042691	Heavy particle separation A method of heavy particle separation, including a primary separation stage which includes the steps of dropping, accumulating, concentrating and discharging of heavy particles and/or a secondary separation stage for concentrating heavy particles which includes the ...	10/25/2011
7757864	Screen assembly designed to conform to the radius of vibrating shakers with crowned decks 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. ...	07/20/2010
7441661	Solids/liquids separator A separator for separating solids and other objects (debris) from a liquid, and having a separator body (2) through which the liquid, having debris entrained therein (16, 19, 20), flows from an inlet (6) to an outlet (13), and a port (...	10/28/2008
7303078	Screen panel 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...	12/04/2007
6926839	Method and apparatus for removing particulate contaminants from commercial laundry waste water A filtration apparatus includes a filter element disposed at a 45 degree angle defining an upper chamber for solids and a lower chamber for liquid. A trough is disposed at the lower end of the filter element. The floor of the trough funnels toward a central drain an...	08/09/2005
6892891	Manure management system using sloped screen separator A manure management system that removes a large percentage of solids from a manure slurry when the slurry is run across a series of sloped screen separators. The sloped screen on the separator has very small openings. In addition, the separator has a water line with...	05/17/2005
6863181	Sloped screen separator that removes solids from a manure slurry A large percentage of solids are removed from a manure slurry when the slurry is run across a sloped screen separator. The sloped screen on the separator has very small openings. In addition, the separator has a water line with spray heads formed across the sloped s...	03/08/2005
6830155	Vibratory screening apparatus There is provided screen apparatus comprising side walls having a lower edge portion configured to accept tubular screen support members. An upper edge extends from the inlet end of the side walls to an apex from which a declining edge extends to the foot of the sid...	12/14/2004
6814242	Rotatively oscillating separator A rotatively oscillating separator comprising separating vessels 4 each having cone-shaped separating plate 5 disposed in the vessel, and drive means 6 for rotatively oscillating said separating vessels 4, mixed rice consisting of unhulle...	11/09/2004
6484885	Solids raised screens A new and unique design use of directional and re-directional raised ribs on a solids control filtering screen, such as those used in drilling wells for hydrocarbons and other substances, in conjunction with a coordinated system of hanging such screens an...	11/26/2002
6149811	Dredging system The present invention is directed to a continuous, portable dredging system that employs a series of screens and gravity separation devices with flocculation to remove sediments from the dredged slurry. The system produces a treated water stream having lo...	11/21/2000
6095338	Separatory screen A sieve screen utilizes a frame to support a plurality of profiled screen wires. These screen wires are arranged on the frame in a symmetrical manner about a center line which is transverse or normal to the direction of flow of material to be separated. T...	08/01/2000
5938936	Method for dewatering flocculated materials The present invention is directed to a continuous, portable dredging system that employs a series of screens and gravity separation devices with flocculation to remove sediments from the dredged slurry. The system produces a treated water stream having lo...	08/17/1999
5443162	High capacity high pressure feeding The production capacity of a conventional high pressure feeder having a pocketed rotor with a slotted screen at the low pressure outlet port is significantly increased by constructing the screen so that its arcuate bars have a width much less than normal,...	08/22/1995
5368170	Popcorn colander A colander structure is arranged of a generally semi-spherical configuration to include a matrix of first apertures directed therethrough of a first width, with a plurality of annular arrays of second apertures extending from a floor portion of the coland...	11/29/1994
5051169	Auger-type flour sifter A flour sifter for separating doughballs from fine particulate matter in a breading mixture, comprises a hopper for receiving the breading mixture. The lower portion of the hopper includes a sifting screen along most of the longitudinal length that is siz...	09/24/1991
4820407	Solids screens A new and unique pattern and use of flexible ribs on a solids filtering screen, such as those used in drilling wells for hydrocarbons and other substances, in conjunction with a coordinated system for hanging such screens and directing the flow of trapped...	04/11/1989
4810270	Separator A separator for separating fibers from fines in a flow of gas includes an enclosed housing which includes a cylindrical upper section and a lower section. A screen basket is fixedly mounted in the housing, and this basket defines a screened cylindrical wa...	03/07/1989
4671877	Dewatering apparatus Dewatering apparatus having a screen with alternate perforate sections and inperforate accelerator sections, both on a slope. The input feed may be pulsed the better to resist any tendency for the screen to blind....	06/09/1987
4650192	Scooping game toy A game toy wherein a vibrator is incorporated in a scooper for scooping up a model piece of a goldfish or the like put in a vessel, and whereby competition is made for catching the model piece in the condition that the vibrations of the vibrator are propa...	03/17/1987
4410425	Flow line filter apparatus An apparatus for filtering drilling mud that is being recirculated out of the drill hole, which substantially comprises the flow conveying tubular section having at its first end a flanged base portion sealably attachable to the top portion of the hydril ...	10/18/1983
4274952	Apparatus for separating solids from a suspension A sieve chain having upper and lower ends is disposed in a housing and comprises a plurality of sieve sections and hinge means connecting adjacent ones of said sieve sections in series from one of said ends to the other. Each of said sieve sections has an...	06/23/1981
4250038	Screen device and method A sieve or screen of the type supported in an inclined position so that a slurry can cascade downwardly over a working surface of the screen is formed with spaced apart, generally parallel rods or wires which extend transversely to the direction of slurry...	02/10/1981
4231861	Grain cleaning apparatus A grain cleaning apparatus having an upstanding housing with a grain inlet, at least one layer of screens disposed below the inlet and a foreign material receiving chamber disposed below the screen, with separate outlets for foreign material and cleaned g...	11/04/1980
4133751	Wire screen with tensioning assembly A sizing screen for sizing particulate materials, for example, is provided which uses a plurality of wire loops arranged to define a plurality of parallel wire strands extending between a first end and a second end of a screen frame. The frame has anchor ...	01/09/1979
4113626	Dewatering screen Screening apparatus provides improved dewatering of liquid slurries by flowing the slurry across a generally parabolically shaped perforate screening surface inclined at an angle to the horizontal. The angularity of the generally parabolically shaped scre...	09/12/1978
4085040	Front feed static screen A static screen separator compact in both a vertical and a horizontal sense, including an inclined screen structure and a facing feed or head box from which a liquid-solids mixture overflows onto the screen. The head box is located to the front or flow fa...	04/18/1978

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Class 209/274 - Concave and convex sifters