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| Number | Title | Issue Date |
| 6290894 | Ferrofluid sculpting apparatus Magnetic sculptures are formed by placing a ferrofluid in a shaped magnetic field. In response to the field, the ferrofluid forms fanciful sculptures as determined by the magnetic field lines. In one embodiment, a low viscosity and surface tension ferrofl... | 09/18/2001 |
| 6254781 | Method for recycling ferrofluid constituents used in a materials separation process Ferrofluid coated particles resulting from a ferrofluid materials separation process are washed with a solvent which is the same material as the liquid carrier employed in the ferrofluid. The result is a "dirty" solvent which is a very weak ferrofluid. Th... | 07/03/2001 |
| 6242994 | Apparatus to reduce push back time in solenoid valves A solenoid with liquid in the gaps between a moving and stationary element is disclosed that includes a secondary kick-back spring used to overcome the viscosity and surface tension effects of the liquid in the gap during the de-energizing phase of the so... | 06/05/2001 |
| 6103107 | System for recycling ferrofluid constituents used in a materials separation process Ferrofluid coated particles resulting from a ferrofluid materials separation process are washed with a solvent which is the same material as the liquid carrier employed in the ferrofluid. The result is a "dirty" solvent which is a very weak ferrofluid. Th... | 08/15/2000 |
| 6068785 | Method for manufacturing oil-based ferrofluid A slurry is formed of particles of a non-magnetic oxide of iron (-Fe2 O3), an oil carrier liquid and a surfactant. The slurry is then processed in an attrition mill where kinetic energy is applied to the slurry to convert the ... | 05/30/2000 |
| 5969589 | Quiet ferrofluid solenoid A solenoid includes a ferrofluid in gaps between the moving and stationary elements which ferrofluid reduces noise caused by activating a plunger positioned within the solenoid. A permanent magnet can be included as a solenoid element to increase magnetic... | 10/19/1999 |
| 5958282 | Low cost method for manufacturing ferrofluid A ferrofluid manufacturing process applies energy to a nonmagnetic -Fe2 O3 starting material to render it magnetic and suitable for use in a ferrofluid. The material is placed, together with a solvent and a surfactant, in a co... | 09/28/1999 |
| 5955934 | Quiet ferrofluid solenoid with cushion A solenoid includes a ferrofluid in gaps between the moving and stationary elements which ferrofluid reduces noise caused by activating a plunger positioned within the solenoid. A permanent magnet can be included as a solenoid element to increase magnetic... | 09/21/1999 |
| 5908987 | Sensor employing a sliding ferrofluid mass in a coated, non-wetting, housing A ferrofluid sensor assembly includes a closed housing containing a movable inductance core material that is isolated from the inner walls of the housing by an isolating material. The isolating material forms a layer between the inductance core material a... | 06/01/1999 |
| 5879452 | Czochralski crystal growth system with an independently supported pull head The pull head of a Czochralski crystal puller is mounted on a frame which is supported independently from the crystal puller receiving chamber. In particular, the pull head is mounted on a rigid frame which is supported by the same surface that supports t... | 03/09/1999 |
| 5851416 | Stable polysiloxane ferrofluid compositions and method of making same A ferrofluid composition comprising a colloidal dispersion of finely divided magnetic particles in a silicone oil carrier in which the surfaces of the magnetic particles are modified with (a) a first surfactant comprising a hydrocarbon having at least one... | 12/22/1998 |
| 5824149 | Method and apparatus for controlling crystal temperature gradients in crystal growing systems An enclosing structure extends into a transition zone of a crystal growing system through which the growing crystal is pulled. One or more independent temperature control devices are secured to the inside surface of the enclosing structure, which control ... | 10/20/1998 |
| 5806856 | On-site fillable liquid magnetic seal An on-site fillable ferrofluidic seal comprises a ferrofluidic seal having at least one ferrofluid conducting channel extending through either the magnet, through one of the pole pieces which sandwich the opposing pole ends of the magnet, or through both ... | 09/15/1998 |
| 5797990 | Apparatus for damping a crystal ingot suspension in a Czochralski crystal puller Orbital oscillations of the crystal ingot suspended in a cable in a Czochralski crystal puller are damped by mechanically connecting a high-temperature conductor to the ingot and generating a magnetic field in the vicinity of the conductor. The magnetic f... | 08/25/1998 |
| 5780741 | Sensor employing a sliding magnet suspended on ferrofluid A ferrofluid sensor assembly includes a permanent magnet which is supported in a hermetically-sealed housing by ferrofluid rings at each end of the magnet. However, the housing is large enough that the ferrofluid rings do not seal the end of the magnet ag... | 07/14/1998 |
| 5636547 | Liquid level monitoring system having ferrofluid pressure sensor A liquid level monitoring system, which monitors the level of liquid in a storage tank, includes a differential pressure sensor that uses a magnetic fluid, or ferrofluid, sensing element. The pressure sensor is U-shaped with a first one leg connected, via... | 06/10/1997 |
| 5593164 | Ferrofluidic seal centering ring A ferrofluidic seal is fitted with a centering ring having an inner edge adapted for engagement with a rotating shaft for centering the seal about the rotating shaft. The centering ring automatically engages the shaft and centers the seal when the seal is... | 01/14/1997 |
| 5594241 | Apparatus and method for jitter attenuation in rotary encoders A signal conditioning unit receives index and data signals from a rotary incremental encoder, and attenuates the pulse-to-pulse jitter of the data signal by passing the data signal through an AND gate having at least two of its inputs tied to the data sig... | 01/14/1997 |
| 5490425 | Ferrofluid pressure sensor and warning device Mechanically simple, reliable devices for measuring pressure or detecting pressures above a certain limit are disclosed. A representative device includes a magnet surrounded by one or more bands of a ferrofluid, and which is free to move within a nonmagne... | 02/13/1996 |
| 5474302 | On-site fillable ferrofluidic seal An on-site fillable ferrofluidic seal comprises a ferrofluidic seal having at least one ferrofluid conducting channel extending through either the magnet, through one of the pole pieces which sandwich the opposing pole ends of the magnet, or through both ... | 12/12/1995 |
| 5462685 | Ferrofluid-cooled electromagnetic device and improved cooling method A convection-cooled electromagnetic device, such as a transformer, and methods of cooling that utilize a ferrofluid as a cooling medium. The device's leakage magnetic field, which can be augmented by auxiliary magnets, draws the ferrofluid toward the devi... | 10/31/1995 |
| 5461677 | Loudspeaker A loudspeaker including one or more secondary magnets positioned proximate to an opening of a gap through which a voice coil moves, to capture escaping ferrofluid and return the fluid to the gap. The secondary magnets have axial poles and are oriented, re... | 10/24/1995 |
| 5452520 | Ferrofluid inclinometer An inclinometer device containing a magnet surrounded at each pole by a thin, discrete band of ferrofluid; these bands are retained against the magnet by its own magnetic field, and suffice to suspend the magnet within a nonmagnetic housing that may be op... | 09/26/1995 |
| 5429000 | Ferrofluid pressure sensor A differential pressure sensor includes a ferrofluid sensing element, or slug, that changes position in a tapered magnetic field in response to a pressure differential. The ferrofluid slug is contained in a tube and moves within the tapered magnetic field... | 07/04/1995 |
| 5340122 | Differentially-pumped ferrofluidic seal A ferrofluidic seal arrangement for sealing a high-speed rotary shaft which passes between an environment at atmospheric or high pressure and an environment at high-vacuum is provided, which is especially useful in a high-speed rotating anode apparatus fo... | 08/23/1994 |
| 5242667 | Solid pellet feeder for controlled melt replenishment in continuous crystal growing process The present invention is directed toward a feeder system for replenishing the melt in a crystal growing system that utilizes a heated crucible containing a pool of melted charge material from which a seen is withdrawn to grow the crystal. The feed system ... | 09/07/1993 |
| 4927164 | Ferrofluid seal with epoxy pole pieces In a ferrofluid seal which comprises a magnet and at least one pole piece, the pole piece is fabricated from a ferromagnetic material which directly bonds to the magnet face. Since the pole piece material directly bonds to the magnet, no additional adhesi... | 05/22/1990 |
| 4898480 | Compact ferrofluidic electrically conducting sealed bearing A sealed, rolling element bearing includes an inner race attached to a shaft, an outer race attached to a housing, a plurality of rolling elements in an annular region and a pair of shields extending inwardly from the outer race toward the inner race so a... | 02/06/1990 |
| 4890850 | Tapered ferrofluid seal A ferrofluid seal wherin the amount of ferrofluid which may be used is increased by tapering the gap in which the ferrofluid is retained from one end of the gap to the other. One side of this gap is the magnet and, where used, pole pieces used to generate... | 01/02/1990 |
| 4865334 | Long-life multi-stage ferrofluid seals incorporating a ferrofluid reservoir A multi-stage ferrofluid seal incorporates a ferrofluid reservoir for extending seal life. The reservoir is located between seal stages and contains a quantity of ferrofluid sufficient to replace ferrofluid in the seal stages which is lost due to evaporat... | 09/12/1989 |
| 4830384 | Compact long-life magnetic fluid seal A compact long-life magnetic fluid seal for sealing between a housing and a magnetically permeable rotating shaft includes an annular magnet having a closely-spaced, noncontacting relationship with the shaft to define a first gap and an annular pole piece... | 05/16/1989 |
| 4824122 | Compact magnetic fluid low pressure seal A bearing and magnetic fluid seal assembly includes a shaft mounted by axially spaced-apart bearings for rotation relative to a housing. A magnetic fluid seal includes an annular magnet axially positioned between the bearings in the space that is wasted a... | 04/25/1989 |
| 4817964 | Ferrofluid exclusion seal and method of assembly A ferrofluid seal apparatus and a method of assembling the seal apparatus, the seal apparatus comprising a housing, an annular permanent magnet and at least one annular pole-piece element, and a sealing ring to secure and seal the permanent magnet and the... | 04/04/1989 |
| 4797013 | Compact ferrofluidic electrically conducting sealed bearing A sealed, rolling element bearing includes an inner race attached to a shaft, an outer race attached to a housing, a plurality of rolling elements in an annular region and a pair of shields extending inwardly from the outer race toward the inner race so a... | 01/10/1989 |
| 4772032 | Compact magnetic fluid low pressure seal A bearing and magnetic fluid seal assembly includes a shaft mounted by axially spaced-apart bearings for rotation relative to a housing. A magnetic fluid seal includes an annular magnet axially positioned between the bearings in the space that is wasted a... | 09/20/1988 |
| 4732706 | Method of preparing low viscosity, electrically conductive ferrofluid composition A low viscosity, electrically conductive ferrofluid composition and method of making and using same, which composition comprises: a first polar liquid carrier; a second polar liquid carrier miscible in the first polar carrier and comprising a polyol, such... | 03/22/1988 |
| 4694213 | Ferrofluid seal for a stationary shaft and a rotating hub A ferrofluid seal for a bearing application with a stationary shaft about which a hub rotates. The seal consists of a permanent magnet and one or more annular pole pieces which form a magnetic circuit with the bearing shaft. The magnetic circuit includes ... | 09/15/1987 |
| 4692826 | Bearing assembly with integrated ferrofluid seal A bearing assembly with an integrated single-stage ferrofluid seal incorporated therein, which assembly comprises: a bearing assembly having an inner and outer race to define a raceway and a plurality of rolling elements within the raceway to permit rotat... | 09/08/1987 |
| 4687596 | Low viscosity, electrically conductive ferrofluid composition and method of making and using same A low viscosity, electrically conductive ferrofluid composition and method of making and using same, which composition comprises: a first polar liquid carrier; a second polar liquid carrier miscible in the first polar carrier and comprising a polyol, such... | 08/18/1987 |
| 4673997 | Electrically conductive ferrofluid bearing and seal apparatus and low-viscosity electrically conductive ferrofluid used therein An electrically conductive ferrofluid-film-bearing apparatus and seal apparatus for a shaft which employs a low-viscosity, electrically conductive ferrofluid composition, which composition comprises a liquid carrier, and contains in combination an electri... | 06/16/1987 |
