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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 |
| 8047549 | Magnetic fluid shaft-sealing device A magnetic fluid shaft-sealing device includes a seal cover (3) attached to a pump housing (1) in which a rotary shaft (2) is mounted. The seal cover (3) includes: a shaft hole (33) extending along an axis, an annular recess (36... | 11/01/2011 |
| 7950672 | Magnetic fluid sealing device A magnet is embedded in an outer rotational shaft provided in a bearing hole of a case, and an outer magnetic circuit and an inner magnetic circuit are formed on the outer peripheral surface and inner peripheral surface of the outer rotational shaft, respectively. I... | 05/31/2011 |
| 7398974 | Magneto-fluidic seal with wide working temperature range A magneto-fluidic seal includes a shaft; a sleeve surrounding the shaft; a housing made of soft magnetic material surrounding the sleeve; a magnet conducting a magnetic flux to the sleeve; and a magnetic fluid in a gap between the sleeve and the shaft, and/or in a g... | 07/15/2008 |
| 7338049 | Self-cooling ferrfluid seal A self-cooling ferrofluid seal includes a housing having a housing case and an external pole piece integrally connected to the housing case where the housing case has a plurality of heat dissipating surfaces, a magnetic circuit within the housing formed in conjuncti... | 03/04/2008 |
| 7327828 | Thermal optimization of ferrofluid seals A hermetic sealing system includes a chamber enclosing a high vacuum and positioned within an ambient environment and a rotatable shaft having a first portion extending into the chamber and a second portion extending out from the chamber. A ferrofluid seal is positi... | 02/05/2008 |
| 7320468 | Sealing arrangement A sealing arrangement for sealing a leakage gap between relatively moveable parts in a flow path between a region of high fluid pressure and a region of low fluid pressure comprises a sealing member having an upstream surface, a downstream surface, a radially outer ... | 01/22/2008 |
| 7290771 | Bellows seals for thermoacoustic devices and reciprocating machinery A bellows has an elongated bellows body defined by a flexible wall. The wall encloses a volume and extends between a first end and a second end. The body has a cross-sectional shape and a cross-sectional dimension that are generally constant between the first and se... | 11/06/2007 |
| 7256523 | Magnetic mounting of a rotor shaft relative to a stator, using a high-Tsuperconductor A first bearing part is arranged fixedly in terms of rotation on a rotor shaft with permanent magnetic elements arranged next to one another and flux guide elements arranged between them. A second bearing part, separated from the first bearing part by a bearing gap,... | 08/14/2007 |
| 7249769 | Seal apparatus A seal (40) provides sealing between two pressure zones (60, 62) and a rotating and non-rotating member (42, 52) by providing a first sealing member (46) between two seal lands (48, 50). A second seal (64) is mounted between... | 07/31/2007 |
| 7237957 | Journal bearing having self-retaining shoes and method of using the same to support a rotating shaft A journal bearing, and a method of using the same, that utilizes self-retaining bearing shoes that prohibit relative movement between an aligning ring and the bearing shoes in the axial direction. In one aspect, the invention comprises an aligning ring; at least one... | 07/03/2007 |
| 7188840 | Magnetic fluidic seal with improved pressure capacity A magnetic assembly for a multistage magnetic fluid rotary seal has a shaft, an annular permanent magnet, at least one pole piece and a radial gap formed between the shaft and the pole piece. The shaft and the pole piece have a plurality of trapezoidal-shaped ridges... | 03/13/2007 |
| 7156724 | Method and apparatus for forming a dynamic magnetic seal using magnetorheological fluid An arcuate, preferably cylindrical, magnetic shunt bar supports a plurality of pin magnets having alternate north and south orientations, defining a ring-shaped array of magnets of alternating orientation. The magnet free ends opposite the shunt bar are positioned t... | 01/02/2007 |
| 7129609 | Magneto-fluidic seal with wide working temperature range A magneto-fluidic seal includes a shaft; a sleeve surrounding the shaft; a housing made of soft magnetic material surrounding the sleeve; a magnet conducting a magnetic flux to the sleeve; and a magnetic fluid in a gap between the sleeve and the shaft, and/or in a g... | 10/31/2006 |
| 7113365 | Disk drive comprising a spindle motor having a windings shield for reduced disk voltage coupling A disk drive is disclosed comprising a disk, a head actuated over a surface of the disk, and a spindle motor for rotating the disk. The spindle motor comprises a ring-shaped stator having a plurality of stator teeth each wound with a winding. The spindle motor furth... | 09/26/2006 |
| 7100923 | Magnetic fluid seal device A magnetic fluid seal device that increases a permissible value of eccentricity for two members to improve sealability and decreases a variation of quality by injecting a magnetic fluid before assembling of parts, that saves structural members to achieve thinning, a... | 09/05/2006 |
| 7090178 | Sealed rotary joint for turret rotator A rotatable payload support turret for operation in a potentially hazardous environment includes a fixed element attached to a vehicle or fixed structure and a rotatable element, supported for rotation with respect to the fixed element. The turret includes a camera ... | 08/15/2006 |
| 7080841 | Hub seal adapter A hub seal adapter has an outer diameter and thickness dimensioned to removably fit into the internal bore of a standard automotive hub in the same position that the grease seal would normally occupy, and be retained in the hub by the same snap ring as would be used... | 07/25/2006 |
| 7066649 | Actuator In an actuator, displacement resistance in axial movement of a slider is reduced to improve durability and enhance maintainability. At each side of the actuator, a slit is made between a top cover and a side cover. Magnetic bodies are provided on the surfaces of bot... | 06/27/2006 |
| 6976682 | Apparatus and method for forming a rotatable ferrofluidic seal between a shaft and a hub An apparatus and method are provided for sealing an outer surface 170 of a shaft 175 to an inner surface 165 of a hub 160. The seal includes a magnet 155, with top and bottom pole pieces 260, 265, and a ferrofluid 270 | 12/20/2005 |
| 6933643 | Multiple radial/axial surfaces to enhance fluid bearing performance In one embodiment, a plurality of axially oriented bearings defined along gaps between rotor and stator are provided to provide radial stiffness to the system; and these bearings are coupled together by radially oriented gaps. Grooves and/or magnets may be defined i... | 08/23/2005 |
| 6910857 | Seal A seal apparatus provides the seal between inner and outer elements. The seal apparatus has a flexible sealing element for forming a seal with a first of the inner and outer elements. At least one support element is secured to the sealing element. The seal further i... | 06/28/2005 |
| 6899338 | Ferrofluid seal incorporating multiple types of ferrofluid A ferrofluid seal apparatus incorporating a multi-stage ferrofluid rotary seal adapted to provide a ferrofluid pressure-type seal about a shaft element extending between a first environment and a second environment, a first magnetic fluid disposed at one stage of th... | 05/31/2005 |
| 6857635 | Ultra high vacuum ferrofluidic seals and method of manufacture A ferrofluid seal incorporates a metal seal comprised of two knife-edges and a flat metal washer is formed between a pole piece and the housing at the axial interface between the parts. One knife edge is machined into the inner face of the housing flange and the oth... | 02/22/2005 |
| 6830248 | Magnetic fluid sealer and method for mounting magnetic fluid sealer A high-performance magnetic fluid sealer which maintains light-shielding property even when an interval change of a gap is large and a method for easily mounting a magnetic fluid sealer. A pair of annular magnets are supported by levitation from a lens barrel by mag... | 12/14/2004 |
| 6800976 | Spindle motor with magnetic seal The present invention relates to a spindle motor with a magnetic seal. A method and an apparatus are described for sealing spindle motors, preferably those used for disk storage units. ... | 10/05/2004 |
| 6769694 | Magnetic fluid seal device In a housed state, a magnetic fluid 4 is positioned in a groove 11 and spaced from the outer circumference of a lens barrel 10, so that a fluorochemical surface modification film of the outer circumference of the lens barrel 10 can be pre... | 08/03/2004 |
| 6746019 | Seal assembly A seal assembly (10) includes a first seal element (12) defining a fist sealing surface (14); displacement means including at least one electromagnet (20) operatively coupled with the first seal element (12), the displacement means... | 06/08/2004 |
| 6736402 | Ferrofluidic seal with controlled leakage to minimize effects of seal stage bursting In a ferrofluid seal that supports a pressure differential between a low pressure side and a high pressure side, a reservoir is created between a first seal stage at the low pressure side and its adjacent seal stage. The volume of the reservoir is relatively large c... | 05/18/2004 |
| 6692237 | Rotary piston cylinder device with radially extending cylinder chambers intersecting at a rotary axis A rotary cylinder apparatus which prevents a fluid from leaking from a contact portion of a piston and a cylinder member and consequently enables efficient rotation. The rotary cylinder apparatus comprises: a rotary cylinder member 2 which has cylinder ch... | 02/17/2004 |
| 6679501 | Motor with stationary shaft and high speed capillary seal A motor or bearing which incorporates the use of a capillary seal adjacent a bearing race between the shaft and surrounding hub or housing. The seal may take a plurality of forms, including a straight capillary seal; a seal formed between the housing and ... | 01/20/2004 |
| 6672592 | Magnetic fluid seal A magnetic fluid seal with an excellent quality for reduction of leak of magnetic fluid. Among the projections of the pole pieces, the projections, that are nearest to the permanent magnet, are placed at positions intruding into the permanent magnet sides... | 01/06/2004 |
| 6572113 | Seal fitting A seal assembly for co-operation with a shaft comprising a seal member which, in use, in a first position, forms a seal against the shaft, a seal housing for retaining the seal member, means for applying a radially inward force to the seal member and mean... | 06/03/2003 |
| 6561516 | Low power high speed disc drive spindle seal A stationary ferrofluidic seal for sealing a stationary shaft to a rotating hub. A formed magnetic is attached to the rotating hub, bounded by upper and lower members to form a shaped cavity. A stationary ring is attached to the shaft and extends into the... | 05/13/2003 |
| 6558042 | Bearing guided ferrofluid seal and seal carrier A bearing guided ferrofluid seal and seal carrier system that may be used with a bearing assembly with an outer annular ring surface. A seal carrier of the present invention has a carrier ferrofluid seal surface and a carrier bearing surface that includes... | 05/06/2003 |
| 6543782 | Non-bursting ferrofluid seal Magnetic fluid seals containing housings, magnets, pole pieces, gaps, magnetic fluids, shafts and bearings of standard type are modified to permit operation at two levels of magnetic intensity in the gaps. During exposure to the operating pressure differe... | 04/08/2003 |
| 6543781 | Spindle-drive motor with a magnetic fluid seal A spindle-drive motor for hard drives having a baseplate, a shaft and one or more bearings for rotational mounting of a rotationally driven rotor, with at least one magnetic fluid seal arranged between the stationary part and the rotating part of the spin... | 04/08/2003 |
| 6464230 | Flexible magnetic rubber brush seal for generators A flexible magnetic brush seal is employed as a low flow fluid film seal and/or a diffusion and mass transfer prevention seal in a hydrogen generator to seal between a hydrogen atmosphere and a fluid on an opposite side of the seal. The brush seal is form... | 10/15/2002 |
| 6429560 | Spindle motor with magnetic seal The present invention relates to a spindle motor with a magnetic seal. A method and an apparatus are described for sealing spindle motors, preferably those used for disk storage units.... | 08/06/2002 |
| 6378874 | Apparatus and method for providing a ferrofluidic seal An apparatus and method are provided for sealing and electrically coupling an outer surface 170 of a shaft 175 to an inner surface 165 of a hub 160 disposed about the shaft. The invention is particularly useful for spindle motors 155 used in disc drives 1... | 04/30/2002 |
| 6334616 | Ferrofluid cap seal for spindle motor A hard disk drive spindle motor has a hub, a drive shaft, and a bearing therebetween. The spindle motor also has a ferrofluid seal to prevent any incidental oil emissions from the bearing from entering the drive. A ferrofluid cap is mounted on the axial e... | 01/01/2002 |
