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...Daniel Webster invented a "bull plow" to pull out tree stumps. It didn't catch on because it was huge and required four oxen to pull it!
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| Number | Title | Issue Date |
| 7732725 | Method and apparatus of classifying fine particles A method of classifying fine particles includes: introducing a fine particle dispersion containing the fine particles to a micro flow channel having an inlet part and a collection part from the inlet part; moving the fine particles to an inner upper side of the micr... | 06/08/2010 |
| 7304258 | System for transporting and selectively sorting particles and method of using the same A system for transporting and selectively sorting particles includes a first wall and a traveling wave grid extending along the first wall. The system includes a second wall having a passage extending therethrough and a gate operatively associated with the passage. ... | 12/04/2007 |
| 7217901 | System for transporting and selectively sorting particles and method of using the same A system for transporting and selectively sorting particles includes a first wall and a traveling wave grid extending along the first wall. The system includes a second wall having a passage extending therethrough and a gate operatively associated with the passage. ... | 05/15/2007 |
| 7119298 | Method for electrostatically separating particles, apparatus for electrostatically separating particles, and processing system An electrostatic separation apparatus for conductive particles and insulating particles with reduced separation time and improved separating capability, comprises a substantially flat-plate shaped bottom electrode (26) provided on lower side, a substantially ... | 10/10/2006 |
| 7073736 | Shredder dust electrostatic separation apparatus and method A shredder dust electrostatic separation apparatus separates and recovers various kinds of crushed pieces included in shredder dust by the use of electrostatic force. The apparatus includes a rotating drum made of a conductive material, which receives supplied shred... | 07/11/2006 |
| 7045734 | Spark induction power conditioner for high tension physical separators A D.C. voltage altering device includes at least one spark induction power conditioner including a first electrode connectable to a high voltage D.C. power source and a second electrode spaced from the first electrode and forming a discharging gap therebetween. The ... | 05/16/2006 |
| 7041925 | Apparatus for the electrostatic separation of particulate mixtures Apparatus for the electrostatic separation of a mixture of particles that exhibit difference in electrical conductivity, comprising: a conductive surface to which conducting particles lose their charge; feeding means for feeding the mixture of particles onto the con... | 05/09/2006 |
| 7012209 | Method of gold separation and gold separation device A method of collecting gold by flowing water over a gold collecting medium located in a sluice to induce a positive surface charge on the gold collecting medium. Feeding gold laden material into the sluice with the flowing water to induce a negative surface charge o... | 03/14/2006 |
| 6951992 | Corona and static electrode assembly A corona and static electrode assembly is attachable to a frame of an existing electrostatic separator and includes a pair of oppositely spaced end panels and an elongate corona support member disposed inwardly of and supported by the respective end panels. The coro... | 10/04/2005 |
| 6827761 | Particle concentrator Particles in a fluid flow are concentrated by a combination of electrical charging and focussing and passage through a virtual impact concentrator. The fluid is passed through an electrical charging section and an electrical focussing section and then to a virtual i... | 12/07/2004 |
| 6797908 | High-tension electrostatic classifier and separator, and associated method The electrostatic classifier and separator is supported by a housing and includes a corona classifier section for classifying particulate materials according to size. Corona element supplies mobile ions for bombarding particulate materials dropping down a passageway... | 09/28/2004 |
| 6789679 | Method and apparatus for separating particles The invention concerns a method and apparatus for separating mineral particles according to their dielectric and/or electrophysical properties. In one practical example, rutile particles can be separated from zircon particles. In the method, the mineral particles wh... | 09/14/2004 |
| 6498313 | Electrostatic particle separation system, apparatus, and related method An electrostatic separation apparatus or system is provided for separating a particle mixture into two constituent species. The system includes a distributor for differentially tribocharging the particle species forming the mixture and supplying the charg... | 12/24/2002 |
| 6452126 | Electrostatic separation enhanced by media addition This invention relates to improving the separation efficiency in a triboelectric separator by adding media against which the components of the mixture will charge. As a result, random charging between the components of the mixture is reduced and controlle... | 09/17/2002 |
| 6390302 | Method and apparatus for separating particles The invention concerns a method and apparatus for separating mineral particles according to their dielectric and/or electrophysical properties. In one practical example, rutile particles can be separated from zircon particles. In the method, the mineral p... | 05/21/2002 |
| 6365050 | Method for stopless and splitless flow field-flow fractionation An improved flow field-flow fractionation (flow FFF) process has been developed which permits the high-resolution separation of analytes without stopping or reversing the axial flow, introducing additional axial flow streams, or further splitting the axia... | 04/02/2002 |
| 6329623 | Electrostatic separation apparatus and method using box-shaped electrodes This invention relates to an apparatus and method for electrostatically separating particles having different electrostatic properties. The apparatus involves two thin box-shaped electrodes facing each other as mirror-images and charged with a voltage fie... | 12/11/2001 |
| 6320148 | Electrostatic method of separating particulate materials A method of separating particulate materials of different properties has been developed. It consists of feeding a mixture of dry, powdered materials to one end of the surface of a planar electrode, which is vibrating to move the particles forward. At leas... | 11/20/2001 |
| 6168029 | Method for separating electrically conductive mineral components from electrically non-conductive mineral components of an ore An improved method for separating electrically conductive components of an ore or mineral sand from electrically non-conductive components of the ore or mineral sand is disclosed which includes processing the ore, adding a polymer, such as an anionic poly... | 01/02/2001 |
| 5904253 | Belt separator system having improved belt geometry In a belt separator system for separating constituents of a mixture of particles, the belt having a leading deflective surface at an acute angle to the direction of belt travel so as to impart a transverse momentum component to the constituent in a direct... | 05/18/1999 |
| 5470554 | Benefication of saline minerals A process is provided for recovering a saline mineral from an ore containing the saline mineral and impurities. The process generally comprises the steps of separating a first portion of impurities from the ore by density separation, electrostatically sep... | 11/28/1995 |
| 5375721 | Apparatus for dry placer mining A dry placer mining machine and a belt assembly for use therewith. The machine concentrates metallic constituents from a gravel mix by fluidizing the mix with air which passes upwardly through the belt assembly, and moving the fluidized mix over the belt ... | 12/27/1994 |
| 5141651 | Pinched channel inlet system for reduced relaxation effects and stopless flow injection in field-flow fractionation A continuous flow FFF process for the separation of samples of particles which uses a modified channel structure to reduce the relaxation effect, reduce sample adhesion to the wall, and where possible eliminate the stop-flow procedure and thus greatly inc... | 08/25/1992 |
| 5039426 | Process for continuous particle and polymer separation in split-flow thin cells using flow-dependent lift forces A process for continuous particle and polymer separation comprising injecting a stream of carrier fluid containing the material to be separated into the inlet end of a thin channel, adjusting the flow rate to a sufficiently high level that flow-dependent ... | 08/13/1991 |
| 5006226 | Fluidized, dry bed, ore concentrator A fluidized, dry bed, ore concentrator in which a uniform air stream is utilized to fluidize ore particles within a region defined in part by two, moving, riffled surfaces. The particles are statically charged to enhance separation of particles within the... | 04/09/1991 |
| 4975182 | Waterflow differential electrical charging process for ores The invention consists of forming an aqueous slurry of water and particles of ore carrying both metals and/or minerals which are passed at relatively high speed along an electrically isolated path in contact with electrically insulating materials and in t... | 12/04/1990 |
| 4894146 | Thin channel split flow process and apparatus for particle fractionation A thin channel split flow process for particle fractionation which effects a rapid and efficient separation of the particles comprising continuously introducing two or more fluid substreams of different composition into separate inlet ports of a thin encl... | 01/16/1990 |
| 4737268 | Thin channel split flow continuous equilibrium process and apparatus for particle fractionation A thin channel split flow process for particle fractionation which effects a rapid and efficient separation of the particles comprising introducing a stream of fluid containing the particles to be separated into the inlet end of a thin enclosed channel wh... | 04/12/1988 |
| 4615797 | Dry washer with hot air supply The electrostatic recovery of gold in the drywasher is improved by providing means to scavenge the waste heat from the internal combustion engine that powers the air blower. This preheats the intake air to the air blower, whereby the equilibrium temperatu... | 10/07/1986 |
| 4451357 | Apparatus for dry placer mining and method of operating same An apparatus for dry placer mining to concentrate recoverable metallic constituents, such as gold or silver, from a dry gravel mix containing same is comprised of a frame for supporting and guiding an endless belt along a path including an upwardly inclin... | 05/29/1984 |
| 4274947 | Electrostatic method and apparatus for sorting fluidized particulate material A multi-constituent mixture of particles is fluidized within an elongated container with a gas permeable base. Opposing horizontal motions are induced in the upper and lower strata of the fluidized material by means of moving baffles mounted on endless ch... | 06/23/1981 |
