Patents by Inventor Nelson J. Groom
Nelson J. Groom has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 6447266Abstract: A blood pump preferably has a magnetically suspended rotor that rotates within a housing. The rotor may rotate about a stator disposed within the housing. Radial magnetic bearings may be defined within the stator and the rotor in order to suspend the rotor. The radial magnetic bearings may be passive magnetic bearings that include permanent magnets disposed within the stator and the rotor or active magnetic bearings. The pump may further include an axial magnetic bearing that may be either a passive or an active magnetic bearing. A motor that drives the rotor may be disposed within the housing in order to more easily dissipate heat generated by the motor. A primary flow path is defined between the rotor and the stator, and a secondary flow path is defined between the stator and the rotor. Preferably, a substantial majority of blood passes through the primary flow path.Type: GrantFiled: April 24, 2001Date of Patent: September 10, 2002Assignees: University of Pittsburgh, The United States of America as represented by the United States National Aeronautics and Space AdministrationInventors: James F. Antaki, Bradley Paden, Gregory Burgreen, Nelson J. Groom
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Publication number: 20010031210Abstract: A blood pump preferably has a magnetically suspended rotor that rotates within a housing. The rotor may rotate about a stator disposed within the housing. Radial magnetic bearings may be defined within the stator and the rotor in order to suspend the rotor. The radial magnetic bearings may be passive magnetic bearings that include permanent magnets disposed within the stator and the rotor or active magnetic bearings. The pump may further include an axial magnetic bearing that may be either a passive or an active magnetic bearing. A motor that drives the rotor may be disposed within the housing in order to more easily dissipate heat generated by the motor. A primary flow path is defined between the rotor and the stator, and a secondary flow path is defined between the stator and the rotor. Preferably, a substantial majority of blood passes through the primary flow path.Type: ApplicationFiled: April 24, 2001Publication date: October 18, 2001Inventors: James F. Antaki, Bradley Paden, Gregory Burgreen, Nelson J. Groom
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Patent number: 6244835Abstract: A blood pump preferably has a magnetically suspended rotor that rotates within a housing. The rotor may rotate about a stator disposed within the housing. Radial magnetic bearings may be defined within the stator and the rotor in order to suspend the rotor. The radial magnetic bearings may be passive magnetic bearings that include permanent magnets disposed within the stator and the rotor or active magnetic bearings. The pump may further include an axial magnetic bearing that may be either a passive or an active magnetic bearing. A motor that drives the rotor may be disposed within the housing in order to more easily dissipate heat generated by the motor. A primary flow path is defined between the rotor and the stator, and a secondary flow path is defined between the stator and the rotor. Preferably, a substantial majority of blood passes through the primary flow path.Type: GrantFiled: July 19, 1999Date of Patent: June 12, 2001Inventors: James F. Antaki, Bradley Paden, Gregory Burgreen, Nelson J. Groom
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Patent number: 5003211Abstract: The invention is a permanent magnet flux-biased magnetic actuator with flux feedback for adjustably suspending an element on a single axis. The magnetic actuator includes a pair of opposing electromagnets 11' and 12' providing bi-directional forces along the single axis to the suspended element. Permanent magnets in flux feedback loops from the opposing electromagnets establish a reference permanent magnet flux-bias to linearize the force characteristics of the electromagnets to extend the linear range of the actuator without the need for continuous bias currents in said electromagnets.Type: GrantFiled: September 11, 1989Date of Patent: March 26, 1991Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space AdministrationInventor: Nelson J. Groom
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Patent number: 5003235Abstract: The invention, a single element magnetic suspension actuator with bidirectional force capability along a single axis, includes an electromagnet 11 and a nonmagnetic suspended element 12. A permanent magnet 13 mounted on the suspended element 12 interacts with a magnetic field established by the electromagnet 11 to produce bidirectional forces in response to a variable force command voltage V.sub.FC applied to the electromagnet 11. A sensor 14 measures the position of the suspended element 12 on the single axis which is a function of force command voltage V.sub.FC.Type: GrantFiled: September 11, 1989Date of Patent: March 26, 1991Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space AdministrationInventor: Nelson J. Groom
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Patent number: 4281384Abstract: An annular momentum control device (AMCD) 11 is operated in a strapped down position on a spacecraft. The signals from the position sensors 18 and 19 at the several AMCD magnetic bearing stations a, b, and c are applied to computers (FIGS. 4 and 5) which compute the angular rate about first and second axes in the plane of the AMCD rim 12 and compute the linear accelerations along the first and second axes and along a third axis perpendicular to the first and second axes.Type: GrantFiled: December 7, 1979Date of Patent: July 28, 1981Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space AdministrationInventors: Nelson J. Groom, Williard W. Anderson, William H. Phillips
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Patent number: 4156548Abstract: Apparatus for providing accurate pointing of instruments on a carrier vehicle and for providing isolation of the instruments from the vehicle's motion disturbances. The apparatus includes two assemblies, with connecting interfaces, each assembly having a separate function. The first assembly is attached to the carrier vehicle and consists of an azimuth gimbal and an elevation gimbal which provide coarse pointing of the instruments by allowing two rotations of the instruments relative to the carrier vehicle. The second or vernier pointing assembly is made up of magnetic suspension and fine pointing actuators, roll motor segments, and an instrument mounting plate around which a continuous annular rim is attached which provides appropriate magnetic circuits for the actuators and the roll motor segments.Type: GrantFiled: February 27, 1976Date of Patent: May 29, 1979Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space AdministrationInventors: Willard W. Anderson, Nelson J. Groom
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Patent number: 4088018Abstract: Apparatus for providing accurate pointing of instruments on a carrier vehicle and for providing isolation of the instruments from the vehicle's motion disturbances. The apparatus includes two assemblies, with connecting interfaces, each assembly having a separate function. The first assembly is attached to the carrier vehicle and consists of an azimuth gimbal and an elevation gimbal which provide coarse pointing of the instruments by allowing two rotations of the instruments relative to the carrier vehicle. The second or vernier pointing assembly is made up of magnetic suspension and fine pointing actuators, roll motor segments, and an instrument mounting plate around which a continuous annular rim is attached which provides appropriate magnetic circuits for the actuators and the roll motor segments.Type: GrantFiled: June 17, 1977Date of Patent: May 9, 1978Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space AdministrationInventors: Willard W. Anderson, Nelson J. Groom