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...that Kleenex tissue was originally designed to be a gas mask filter? It was developed at the beginning of World War I to replace cotton, which was then in short supply as a surgical dressing.
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| Number | Title | Issue Date |
| 6398035 | Maximizer for gravity separators A gravity separator with improved efficiency comprising a gravity table with pins at the feed area and a flow channeler. The pins create space in the bed of material to be separated which increases stratification of the weight fractions. The flow channele... | 06/04/2002 |
| 5975309 | Fluidized-bed classifier A fluidized-bed classifier has a vessel defining a space divided into an upper fluidized-bed chamber and a lower gas chamber by a perforated dispersion plate having the shape of a funnel. Rising currents of a gas, such as air, are blown through the disper... | 11/02/1999 |
| 5957297 | Apparatus for separating heavy particles of material from lighter ones Apparatus for separating heavy particles of material from lighter particles, e.g. for separating impurities from powdery or fragmental material, such as fibers or chips. The apparatus includes a carrier surface (1) which is pervious to gas, onto which the... | 09/28/1999 |
| 5740920 | Jigging screen device with pneumatic valve control A pneumatic jigging screen device has an air chamber for generating pulsation which is connected to a compressed air source. An air outlet is provided. An air inlet valve in the form of a disk valve is connected between the compressed air source and the a... | 04/21/1998 |
| 5382370 | Screening system A process for continuously separating relatively coarse particles from a suspension of a mixture of particles in a liquid wherein the suspension is caused to pass through a screening medium which is rotating in its own plane so that the coarse particles a... | 01/17/1995 |
| 5375720 | Dry separation of particulate material of different densities An air concentrator for dry separation of gold and other heavy minerals from alluvial deposits comprises a housing having a number of open-topped chambers arranged in a ring-like configuration and surmounted by a screen having rings thereon forming annula... | 12/27/1994 |
| 5301811 | Apparatus for the separation of grain material and the sorting out of heavy inclusions from grain material An apparatus for separating grain material and for sorting out heavy inclusions from a product flow, particularly stones from gain material, in which the product flow is fed to an inclined layering table and guided so as to be substantially layered thereo... | 04/12/1994 |
| 5183161 | Process and apparatus for separating grain mixture Process and apparatus for separating grain mixture, e.g. for separating heavy inclusions, such as stones (28), from grain product, in which the product is guided via an inclined oscillating layering table surface, through which air flows, so as to be subs... | 02/02/1993 |
| 5048693 | Method and apparatus for sorting articles with small density differences utilizing a flotation stream A method and apparatus for sorting articles with small density differences utilizing a flotation stream. A separator is provided in which a flotation stream continuously flows through a trough and is used to effect the separation of a mixture of articles ... | 09/17/1991 |
| 5024334 | Method and means for gravity table automation A system for gravity table separation including a gravity table for separating materials and a detector operatively associated with the gravity table for detecting the movement of control particles with respect to the gravity table during its operation. T... | 06/18/1991 |
| 4971111 | Rotary piston valve arrangement A rotary piston valve arrangement, for a pneumatic settling tank, including rotary piston valves disposed in a common housing, with a first rotary piston valve being designed for the control of an additive stroke, and a second rotary piston valve being de... | 11/20/1990 |
| 4946044 | Aeration separator An aeration separator for separating lighter and heavier materials in a separation chamber in which the material flows through a downwardly sloping passage in the lower region of the separation chamber toward a lower discharge while air flows upwardly thr... | 08/07/1990 |
| 4865722 | Method and apparatus for separation using fluidized bed A separator suitable for processing agriculture products in a fluidized bed flowing through an inclined trough under the influence of gravity. The fluidization medium is recirculated from the output end of the trough back to the input end thereof using a ... | 09/12/1989 |
| 4861464 | Method and apparatus for separation using fluidized bed A gas is forced upwardly through a fluidization medium, such as sand, producing a fluidized bed which flows under the influence of gravity through an inclined trough. The separation of the side walls of the trough decreases in the direction of flow of the... | 08/29/1989 |
| 4832835 | Air pillow in the air chambers of a bottom pulsed jigging machine A method and apparatus for treating minerals such as coal in a jig bed having a downwardly opening air chamber beneath the bed wherein the chamber has an air compartment at the upper end retaining a cushioned pillow of air between each jig pulsation with ... | 05/23/1989 |
| 4804463 | Gravity separator The present invention is a gravity separator for classifying particulate matter as to weight. The invention herein uses a screened vibrating deck having a flow of air therethrough for separating the particulate matter placed thereon. The air flow is provi... | 02/14/1989 |
| 4755284 | Elutriator An elutriator (1) for separating different grades of leaf vegetable material comprises an elutriation zone (17) disposed above a flow distributor, and gaseous supply means (13) for supplying a gaseous medium to the elutriation zone (17) through the flow d... | 07/05/1988 |
| 4747942 | Pulse generator for an air pulsed jigging machine A wet jig mechanism for handling coal or other minerals wherein a container receives a slurry of water and coal and the water is pulsed by delivering an alternate charge of compressed air beneath the surface of the water and alternately venting the area b... | 05/31/1988 |
| 4712682 | Electronic valve control for sloughing machines An electronic control method and apparatus for controlling the sloughing strokes in sloughing machines for coal and other minerals, has a stroke frequency generator which supplies recurrent signal codes to parallel-connected inlet and outlet stroke genera... | 12/15/1987 |
| 4673491 | Process and apparatus for the centrifugal separation of fine-grain mineral mixtures Separating elements (14) arranged about a central shaft (1a) rotate in common about the main axis (A) and individually about their longitudinal axes (B). A centrifugal distributor (6) distributes fine-grain mineral mixture mixed with fluid uniformly to th... | 06/16/1987 |
| 4574046 | Centrifugal jig for ore beneficiation A centrifugal jig to beneficiate ore by separating a heavier particulate fraction from a lighter particulate pulp. The jig provides a rotor with a vertical cylindrical jig screen rotating in a fluid filled hutch to support a vertical jigging bed. The jigg... | 03/04/1986 |
| 4566487 | Cylindrical piston-type slide valve for pneumatic jigging machines An arrangement for a rotary cylindrical piston-type slide valve for pneumatic jigging machines includes a housing of symmetrical design including a double rotary piston slide valve portion and a rotary slide valve single portion mounted in a symmetrical a... | 01/28/1986 |
| 4559135 | Short, broad jigging machine, particularly for finest grain sizing of minerals A jigging machine comprises at least one pulsation chamber, particularly for finest grain sizing of coal or other minerals which traverse the jigging machine on the jig bed which is shorter in the direction of motion of the minerals that at right angles t... | 12/17/1985 |
| 4508620 | Method of and apparatus for feeding and discharging air for pneumatic jigs A method of and apparatus for feeding and discharging air for pneumatic jigs, includes feeding and discharging pressure air to and from air chambers, which are opened at their respective lower ends, and which are formed in water-filled tanks, to verticall... | 04/02/1985 |
| 4485010 | Wet jigging machine for dressing coal or other minerals A wet jigging mechanism for handling coal or other minerals including a mineral containing tank, a pulsed air chamber opening downwardly into the tank, a compressed air source with a conduit and a vent conduit with valves in the conduit, the valves includ... | 11/27/1984 |
| 4359383 | Placer mining apparatus A portable, dry-placer mining apparatus is provided with a vacuum chamber which defines a contained region of lower-than-atmospheric pressure which establishes the mode or means for drawing material into the chamber. The material is then ejected therefrom... | 11/16/1982 |
| 4342654 | Pulsation amplitude control for pneumatically pulsated liquid The invention concerns the separation of granular products of different density in a pneumatically pulsated liquid medium. To control the pulsation amplitude, the level of separation of two layers of the product is detected by a sensor which emits a corre... | 08/03/1982 |
| 4330400 | Apparatus for separating dust, dirt and the like from particulate material An apparatus for separating dust, dirt and the like from particulate material utilizes a flow of carrier fluid which passes through the particulate material on a grid or screen. The heavier particulate material falls through the grid while the lighter mat... | 05/18/1982 |
| 4294693 | Air flotation ore enriching apparatus Virgin ore in granular form is enriched by air flotation classification separating at least a large part of the gangue. Suspension of the ore is effected immediately as supplied to the inlet section of the classification trough by copious upward flow of a... | 10/13/1981 |
| 4282091 | Peanut separator This application discloses a separator for separating granular materials according to specific weight including an air permeable reciprocatory deck for supporting a bed of the granular material thereon and defining an elongate discharge opening therefrom ... | 08/04/1981 |
| 4280903 | Apparatus for separating sand from botanical fines A mixture of botanical fines and sand is separated by a porous separating medium horizontally disposed within an enclosed chamber in which an upflowing stream of gas carries out the separation. The porous separating medium is comprised of a pair of oppose... | 07/28/1981 |
| 4216080 | Method and apparatus for separating sand from botanical fines A mixture of botanical fines and sand is separated by a porous separating medium horizontally disposed within an enclosed chamber in which an upflowing stream of gas carries out the separation. The porous separating medium is comprised of a plurality of p... | 08/05/1980 |
| 4127480 | Settling machine A settling machine for upgrading materials, particularly for upgrading coal, comprises at least one settling chamber filled with water and having a jig screen covering at least a part of the chamber arranged at the water level. The chamber is also connect... | 11/28/1978 |
| 4070275 | Material treating apparatus including pneumo-hydraulic vibrator Material treating apparatus including one or more pneumohydraulic vibrators. The apparatus includes a container with cells separated by at least one valve lying on a supporting frame, the valve having a movable valve element which is urged toward its valv... | 01/24/1978 |
| 4035288 | Fluidized bed seed separator A bed of fluidized material is used to separate seeds on the basis of specific gravity. The bed may be a rotating annulus and it may have one or more layers of micro-balls at the bottom. Means for rotating the annulus and various discharge means are discl... | 07/12/1977 |
