Patents Examined by George Harris
  • Patent number: 5581223
    Abstract: A superconducting magnet for producing a uniform magnetic field, including a main coil comprising first superconducting coils, and active shield comprising second superconducting coils and arranged in such a manner as to coaxially surround the main coil, and a self-shield comprising magnetic material and arranged in such a manner as to coaxially surround the active shield. The magnetic moment of the active shield is smaller in absolute value than and opposite in direction to the magnetic moment of the main coil.
    Type: Grant
    Filed: February 2, 1989
    Date of Patent: December 3, 1996
    Assignee: Fuji Electric Co., Ltd.
    Inventors: Haruo Ono, Michiru Fujita
  • Patent number: 5532664
    Abstract: A modular superconducting energy storage device includes a plurality of superconducting magnet modules joined in series in axial alignment. Each module comprises a core member having a superconducting coil member wound around it and a tensioning member that retains tension in the superconductor. The ends of the superconducting magnet are adapted for connection to a current source or to the free ends of the superconducting cable of an adjacent module as required. Each module is adapted for attachment to an adjacent module for retension in axial alignment. The attachment of additional modules increases energy storage capacity accordingly.
    Type: Grant
    Filed: July 18, 1989
    Date of Patent: July 2, 1996
    Assignee: Superconductivy, Inc.
    Inventors: Warren E. Buckles, Richard A. Lundy
  • Patent number: 5187462
    Abstract: A multiple magnet assembly for magnetizing a magnetizable element of a desensitizable electromagnetic article surveillance marker, in which each successive assembly provides at a working surface a magnetic field of the same polarity but decreasing intensity. Any demagnetization effect attributable to reverse or back fields associated with one assembly are overcome by magnetization produced by a subsequent assembly, thus allowing markers having magnetizable elements with significantly different coercivee forces to be magnetized by the same apparatus.
    Type: Grant
    Filed: February 15, 1990
    Date of Patent: February 16, 1993
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Samuel Montean
  • Patent number: 5128643
    Abstract: A magnetic shield is presented comprising a shell of ferromagnetic material, augmented by one or more shielding magnets. The shielding magnets may be permanent magnets, electromagnetic coils, or other sources of magnetic flux. These shielding magnets are placed in close proximity to the shell, on the surface facing the region to be shielded, and are arranged to cancel any magnetic flux penetrating through the ferromagnetic shell into the region to be shielded. This invention provides magnetic protection for an exterior region when the shield is assembled around a magnet whose external field is to be contained, such as an MRI magnet. This invention also provides protection within an interior volume which is to be protected from an exterior source such as the Earth's magnetic field. The method by which the invention is applied is an iterative one, in which the shielding magnets are applied to substantially cancel the leakage field and then adjusted to minimize the remaining field in the shielded region.
    Type: Grant
    Filed: September 24, 1990
    Date of Patent: July 7, 1992
    Inventor: David E. Newman
  • Patent number: 5126712
    Abstract: A solenoid apparatus comprising a solenoid case (27) having an open end and a substantially closed end, a plunger (30) electromagnetically movably mounted in the solenoid case, and a substantially cup-shaped flexible water-tight boot (40). The cup-shaped boot (40) surrounds an end portion of the plunger (30) projecting from the solenoid case (27) and connected to the open end of the solenoid case, the flexible boot (40) having a bottom wall central portion intimately secured to the end portion of the plunger (30). The flexible boot (40) comprises a vent hole (44) defined by a hollow tube (45) extending through the boot wall in parallel to the plunger and a flexible valve plate (48) formed integral with and inside of the boot wall and biased by the elasticity of the material of the boot (40) into an open position (FIG. 5).
    Type: Grant
    Filed: May 15, 1990
    Date of Patent: June 30, 1992
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Takeshi Sugiyama
  • Patent number: 5119057
    Abstract: A permanent magnet structure having at least one loop of circulating flux comprises a first and second plurality of uniformly magnetized prismatic magnetic material sections forming a polygonal shaped cavity and having a point F positioned along a zero equipotential base line joining two vertices within the cavity, that point being the reference for a figure of merit M corresponding to a maximum field strength and a minimum ratio of the value of the area of magnetized material to the area of the cavity. The first plurality of sections totally define the cavity and have their respective remanences aligned to result in a flux passing orthogonally through the base line. The second plurality of section is oriented with respect to their respective remanences and the first sections so as to confine the flux within the cavity. A third plurality of nonmagnetized magnetic sections encloses the base line and borders the first sections for providing an inductive path to channel the flux and close the loop.
    Type: Grant
    Filed: October 19, 1989
    Date of Patent: June 2, 1992
    Assignee: New York University
    Inventor: Manlio G. Abele
  • Patent number: 5107237
    Abstract: A sub-miniature circuit breaker particularly suited for use with aircraft simulators is shown which has the same look and feel of circuit breakers used in aircraft. The circuit breaker has a push-pull/actuator and ball latch mechanism and a solenoid operated trip mechanism.
    Type: Grant
    Filed: November 16, 1990
    Date of Patent: April 21, 1992
    Assignee: Texas Instruments Incorporated
    Inventor: Robert Peterson
  • Patent number: 5099215
    Abstract: The device is provided for detachably coupling a power source to a lead pin of the superconducting magnet, the magnet being located in a cryostat using helium and the lead pin being in the region of helium vapor. Device includes a split connector formed to engage the pin, an elongated rod joined to the connector in conductive relationship, and a torque tube positioned around the rod in rotatable relationship. The tube is rotated, a nut joined to the tube and positioned around split connector causes the connector to tightly grip the pin. The device is configured to direct a flow of helium vapor along a path which is proximate to the interface between the connector and pin, to remove heat from the interface and thereby reduce resistance to current flow across the interface.
    Type: Grant
    Filed: August 29, 1990
    Date of Patent: March 24, 1992
    Assignee: General Electric Company
    Inventors: Daniel C. Woods, William S. Stogner
  • Patent number: 5083105
    Abstract: Four magnet cartridge axial supports are provided to prevent axial motion between the magnet cartridge and the surrounding vacuum vessel. Each axial support includes two high strength steel rods in parallel. The rods are brazed to a bar on one end which mounts to the magnet cartridge. The other end of the rods is brazed to a threaded stud which is secured by a bolt to a bracket secured to the vacuum vessel.
    Type: Grant
    Filed: April 6, 1990
    Date of Patent: January 21, 1992
    Assignee: General Electric Company
    Inventors: Kenneth G. Herd, Evangelos T. Laskaris, Mark E. Vermilyea
  • Patent number: 5079531
    Abstract: A deflection yoke arrangement with geometry correction includes horizontal and vertical deflection coils for scanning a raster pattern on a phosphor screen of a cathode ray tube. A support housing suitable for positioning about the neck of the cathode ray tube contains the coils and has a front rim formed with a plurality of slots near the outer periphery. A plurality of brackets formed from magnetically permeable material are located in corresponding ones of the slots. Each bracket comprises two flat end sections joined to opposite sides of a flat central part at substantially right angles thereto. One of the flat end sections of each bracket collects magnetic flux generated by the coils and channels the flux via the central part to the other end section. The plurality of brackets shape the deflection magnetic field in the region about the front rim to provide the geometry correction.
    Type: Grant
    Filed: September 10, 1990
    Date of Patent: January 7, 1992
    Assignee: Videocolor S.A.
    Inventors: Eric Audoux, Jean-Pierre Fourche, Jean Rousseau
  • Patent number: 5079533
    Abstract: Switchable superconducting rings and hemi-rings positioned on the poles of magnets or electromagnets, are used to electronically concentrate magnetic fluxes, or to diffuse such fluxes within the space that is between such poles.
    Type: Grant
    Filed: March 21, 1989
    Date of Patent: January 7, 1992
    Assignee: International Superconductor
    Inventor: Aharon Z. Hed
  • Patent number: 5077533
    Abstract: A deflection yoke for a cathode ray tube, including a first yoke portion and a second yoke portion engaged with opposite sides of the cathode ray tube neck. Each yoke portion includes a main winding for producing substantial first and associated higher harmonic magnetic fields in the neck and a correction winding for producing substantial third and higher harmonic fields. The correction winding is formed by running normally screen end transverse main winding turns longitudinally with the neck toward the cathode ray tube gun end in one yoke portion quadrant and returning them to the screen end transverse main winding in the other yoke portion quadrant.
    Type: Grant
    Filed: September 28, 1990
    Date of Patent: December 31, 1991
    Assignee: Syntronic Instruments, Inc.
    Inventor: Fredric G. Klingelhofer
  • Patent number: 5065126
    Abstract: In a linear actuator including a casing, an output shaft passing through the casing and being mounted slidably in a direction along the axis thereof, a solenoid coil disposed within the casing in coaxial relation to the output shaft, a magnet disposed in such a manner that the magnetic flux thereof is linked with windings of the coil, the output shaft mechanically connected to one of the magnet and the coil to form a movable part, and a spring adapted to urge the output shaft in one direction along the axis thereof, and a spacer made of high permeability material and interposed between the casing and either the coil or the magnet, whichever is fixed on the casing to form a stationary part.
    Type: Grant
    Filed: June 27, 1989
    Date of Patent: November 12, 1991
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Hidemi Suzuki, Hiroyuki Yamada, Mikio Nakagawa
  • Patent number: 5065128
    Abstract: A solenoid coil is fabricated by precisioin winding a length of bondable magnet wire on a mandrel, heating and axially compressing the precision-wound convolutions to cause the bondable insulation to deform into a unitary, void-free mass, but without deforming the pre-existing circular cross section of the conductive metal core of the wire, and allowing the wire to cool such that the mass immovably captures the convolutions of the conductive core to thereby form a free-standing coil. The coil is then disposed in a mold cavity where the entirety of the coil is encapsulated. This produces a solenoid coil that is well-suited for use in high-pressure "wet" environments because the encapsulated assembly is strong and leak-proof. The encapsulant may be molded in such a manner as to have no seams extending from its surface to the winding.
    Type: Grant
    Filed: December 14, 1990
    Date of Patent: November 12, 1991
    Inventor: Eric J. Schmitt-Matzen
  • Patent number: 5059934
    Abstract: In a cross-coil rotary magnet device, a rotor (32) which is mounted rotatably together with a shaft (35) is formed of a permanent magnet (33) with diametrically opposite permanent magnet poles and a coil arrangement (10, 11) with coils which are arranged at an angular distance apart of, in particular, 90.degree.. For receiving the coils there is provided a coil body (14) which is divided into two parts (15, 16) and in which bearings (36, 37) of the shaft (35) of the rotor (32) are shaped in such a manner that the shaft protrudes out of the coil body at least one front outer end (12). One of the two parts (15, 16) of the coil body (14) has on this outer end tab-shaped clips (24-27) for the clamping attachment of an intermediate body (2). Bores (38-43) for connecting pins (4-7) are provided in the coil body parallel to the shaft (35). The cross-coil rotary magnet device can thus be adapted to numerous applications.
    Type: Grant
    Filed: August 4, 1989
    Date of Patent: October 22, 1991
    Assignee: VDO Adolf Schindling AG
    Inventor: Roland Sudler
  • Patent number: 5053756
    Abstract: An electromagnetic relay with a return spring is described, where the relay consists of a solenoid coil with a movable armature as the drive and a contact spring assembly, and there is an actuating rod that starts from one end of the armature and engages with spiral springs by means of catches for actuation of the contact, whereby the return spring at the other end of the actuating rod returns the contact spring assembly to home position.In order to achieve a significant reduction in force with the contact spring assembly in actuating the relay, the reset spring here is designed as a top dead center spring such that when the relay is driven against the return spring, the force needed to bend the spring is reduced.
    Type: Grant
    Filed: December 18, 1990
    Date of Patent: October 1, 1991
    Inventors: Gerhard Wehrle, Ursula Seitz, Karl Blaschi
  • Patent number: 5047741
    Abstract: A superconductive foil and a first and second foil of current conducting material. The first and second foil are soldered symmetrically about said superconductive foil forming a superconductive tape. The tape is wound in helical layers forming a coil. Adjacent turns of the tape are electrically insulated from one another. A strip of electrically conductive foil is situated between layers of tape and electrically isolated therefrom. The strip of electrically conductive foil encloses the inner layers of the tape, with the ends of the strip joined together to form an electrically conductive loop. The coil is epoxy resin impregnated.
    Type: Grant
    Filed: August 17, 1989
    Date of Patent: September 10, 1991
    Assignee: General Electric Company
    Inventor: Evangelos T. Laskaris
  • Patent number: 5047743
    Abstract: An integrated magnetic element is provided, which comprises at least two magnetic elements of dissimilar materials. The integrated magnetic element is subjected to the same magnetomotive force, in order to induce the same magnetization in each element. The resulting integrated magnetic element will have a force of attraction or repulsion greater than that of a magnet comprising only one magnetic element and thus will do more useful work when incorporated into a magnetic device such as a solenoid, relay, rotor of a motor, or memory device.
    Type: Grant
    Filed: March 28, 1989
    Date of Patent: September 10, 1991
    Inventor: Stanley P. Scesney
  • Patent number: RE33736
    Abstract: A device is disclosed which uses permanent magnets to manipulate charged ticle beams, such as those employed in traveling wave tubes, wigglers, and undulators. Tapered pole pieces are inserted between magnets in a periodic permanent magnet array, and the taper is oriented away from the beam path. The magnets themselves may also be tapered, but the taper is oriented toward the beam path. Tapering is described according to the cross sections formed when the plane which contains the beam path intersects the magnets and pole pieces.
    Type: Grant
    Filed: August 30, 1990
    Date of Patent: November 5, 1991
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: John P. Clarke
  • Patent number: RE34229
    Abstract: A cylindrical permanent magnet suitable for use as the rotor magnet of a stepping motor. The magnet is a sintered cylindrical permanent magnet having a composition expressed by MO.nFe.sub.2 O.sub.3, where M represents Ba, Sr, Pb or mixture thereof, while n represents a value of 5 to 6. The sintered cylindrical permanent magnet is provided on its surface with multipolar anisotropy of more than 8 (eight) magnetic poles. Disclosed also is a method of producing the cylindrical permanent magnet.
    Type: Grant
    Filed: October 6, 1989
    Date of Patent: April 20, 1993
    Assignee: Hitachi Metals, Ltd.
    Inventors: Motoharu Shimizu, Noriyuki Noda, Yoshihiro Noguchi