Patents by Inventor Samnathan Murthy
Samnathan Murthy 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: 6583952Abstract: A hydrodynamic bearing system where the bearing includes a shaft and two independent bearings, including a top cone or bi-sphere and a bottom cone or bi-sphere separated by a segment of the shaft. The bearing includes a hub supported bearing element rotating around the shaft and the shaft supported top cone and bottom cone; complementary surfaces of the bearing element and the cone define a narrow gap between the bearing support element for the bearing fluid. Sealing plates or seal elements define a fluid gap with a radially extending face of the cone; a gap also exists between an interior surface portion of each cone and the shaft. These gaps are connected so that separate flow paths are established, one around the top cone or bi-sphere and one around the bottom cone or bi-sphere. By providing two independent bearings, the stator can be mounted to the shaft, facing magnets supported on the hub to form an in-hub motor.Type: GrantFiled: July 24, 2000Date of Patent: June 24, 2003Assignee: Seagate Technology LLCInventors: Alan Lyndon Grantz, Norbert Steven Parsoneault, Samnathan Murthy, Hans Leuthold, Mohamed Mizanur Rahman
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Patent number: 6296390Abstract: A hydrodynamic bearing having a shaft relatively rotatable with rest to a surrounding sleeve and having a thrust plate of or near one end thereof. The shaft and sleeve define a journal bearing extending substantially the full length of the two relatively rotating parts.Type: GrantFiled: February 24, 1999Date of Patent: October 2, 2001Assignee: Seagate Technology LLCInventors: Etoli Wolff, Samnathan Murthy, Norbert Steven Parsoneault, Hans Leuthold
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Patent number: 6280088Abstract: A bearing assembly including a bearing cone (50) having a crowned bearing surface (56) with V-shaped grooves (60) that are shallow at their apex (62) and deepest at the outer edges (52, 54). When mated with a female bearing seat, lubricating fluid builds up along the midline of the bearing surface as the bearing seat rotates about the bearing cone.Type: GrantFiled: February 1, 2000Date of Patent: August 28, 2001Assignee: Seagate Technology LLCInventors: Hans Leuthold, Matt L. Shumway, Alan L. Grantz, Roger A. Addy, Norbert S. Parsoneault, Samnathan Murthy, Mohamed M. Rahman
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Patent number: 6144523Abstract: A hydrodynamic bearing useful as a bearing cartridge or as the cartridge may be incorporated into a spindle motor or the like, where the bearing includes a stationary shaft and two independent bearings, comprising a top cone and a bottom cone separated by a segment of the shaft. The bearing includes a sleeve rotating around and surrounding the shaft, and the top cone and bottom cone and defining a narrow gap between the sleeve and the shaft and cones. Sealing plates are supported on the sleeve to seal off the ends of the bearing and are located along the shaft beyond the cones. A gap also exists between an interior surface portion of each cone and the shaft. Thus, separate flow paths are established, one around the top cone and one around the bottom cone. By providing two independent paths, the flow rates do not have to be the same in each conical flow path for the bearing seals to function properly.Type: GrantFiled: December 19, 1997Date of Patent: November 7, 2000Assignee: Seagate Technology LLCInventors: Samnathan Murthy, Alan Lyndon Grantz, Steve Parsoneault, Roger Allen Addy, Peter R. Riegler, Mohamed Mizanur Rahman
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Patent number: 6118620Abstract: A hydrodynamic bearing system where the bearing includes a shaft and two independent bearings, comprising a top cone or bi-sphere and a bottom cone or bi-sphere separated by a segment of the shaft. The bearing includes a hub supported bearing element rotating around the shaft and the shaft supported top cone and bottom cone; complementary surfaces of said bearing element and said cone define a narrow gap between the bearing support element for the bearing fluid. Sealing plates or seal elements define a fluid gap with a radially extending face of the cone; a gap also exists between an interior surface portion of each cone and the shaft. These gaps are connected so that separate flow paths are established, one around the top cone or bi-sphere and one around the bottom cone or bi-sphere. By providing two independent bearings, the stator can be mounted to the shaft, facing magnets supported on the hub to form an in-hub motor.Type: GrantFiled: April 14, 1998Date of Patent: September 12, 2000Assignee: Seagate Technology LLCInventors: Alan Lyndon Grantz, Norbert Steven Parsoneault, Samnathan Murthy, Hans Leuthold, Mohamed Mizanur Rahman
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Patent number: 6065877Abstract: A bimetallic part is formed from metals or comprises metals with different thermal expansion coefficients. A first element defines the part and defines one surface of the bearing gap and has a first coefficient of expansion and a second element is wholly or partially inserted into and constrained within the first element and having a different coefficient of thermal expansion so that as the temperature changes, the stress created by the differential expansion of the two elements will cause the overall part to deform elastically as a function of temperature. This deformation will cause the gap, the elements being properly selected, to narrow as temperature rises (and viscosity falls) and to widen as temperature falls (and viscosity rises).Type: GrantFiled: October 23, 1998Date of Patent: May 23, 2000Assignee: Seagate Technology, Inc.Inventors: Hans Leuthold, Alan Lyndon Grantz, Matt L. Shumway, Norbert S. Parsoneault, Etoli Wolff, Michael D. Kennedy, Samnathan Murthy, Raquib U. Khan, Mohamed M. Rahman, Wesley R. Clark
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Patent number: 6019516Abstract: A bearing assembly including a bering cone (50) having a crowned bearing surface (56) with V-shaped grooves (60) that are shallow at their apex (62) and deepest at the outer edges (52, 54). When mated with a female bearing seat, lubricating fluid builds up along the midline of the bearing surface as the bearing seat rotates about the bearing cone.Type: GrantFiled: April 14, 1998Date of Patent: February 1, 2000Assignee: Seagate Technology, Inc.Inventors: Hans Leuthold, Matt L. Shumway, Alan L. Grantz, Roger A. Addy, Norbert S. Parsoneault, Samnathan Murthy, Mohamed M. Rahman
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Patent number: 5946958Abstract: An apparatus for forming grooves in the surface of an article is disclosed. The apparatus includes a cage which has a circular cage wall with an annular pattern of holes in the wall. The apparatus also includes a plurality of spherical balls, each rotatably disposed in a respective hole of the cage wall and has a diameter greater than the wall thickness. The apparatus further includes a pin located within the cage, the pin has a circumferential groove in a plane coincident with the plurality of spherical balls and holes in the cage wall so that the pin holds the balls in the groove, the balls protruding through the cage wall and engaging the surface of a workpiece to be grooved so that the balls roll in the groove in the pin and, with movement of the workpiece and the apparatus, cause grooves to be formed in the interior surface of the workpiece.Type: GrantFiled: August 2, 1996Date of Patent: September 7, 1999Assignee: Seagate Technology, Inc.Inventors: Wesley Ronald Clark, Roger Allen Addy, Samnathan Murthy, David Jennings
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Patent number: 5940246Abstract: A disc drive data storage system according to the present invention includes a stationary member, a rotatable member and a hydro bearing which interconnects the stationary member and the rotatable member. At least one data storage disc is attached to and is coaxial with the rotatable member. The hydro bearing includes an electrically non-conductive lubricant and an electrically conductive, non-metallic additive.Type: GrantFiled: November 14, 1996Date of Patent: August 17, 1999Assignee: Seagate Technolog, Inc.Inventors: Raquib U. Khan, Samnathan Murthy, Norbert S. Parsoneault, Hans L. Leuthold
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Patent number: 5793129Abstract: For a precision spindle motor, an invention for reducing distortion resulting from interference fits of a thrust plate to spindle motor shaft and of a counter plate to a journal. A method of assembly according to the invention includes the step of balancing an interference pressure about a centerline of at least one of the thrust plate and the counter plate of the spindle motor. A precision spindle motor according to the invention comprises a journal having a bore defined therein, a shaft located in the bore, a thrust plate mounted to a top portion of the shaft by means of an interference fit, and a counter plate mounted to the journal adjacent to the thrust plate by means of an interference fit, wherein an interference pressure is balanced about a centerline of at least one of the thrust plate and the counter plate.Type: GrantFiled: May 30, 1997Date of Patent: August 11, 1998Assignee: Seagate Technology, Inc.Inventors: Norbert Steven Parsoneault, Hans Leuthold, David John Jennings, Samnathan Murthy
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Patent number: 5666716Abstract: For a precision spindle motor, an invention for facilitating interference fits of a thrust plate to spindle motor shaft and of a counter plate to journal. A method is provided for assembling a spindle motor using press fits of a thrust plate to a shaft having an undercut for providing a relief to reduce unwanted translation into a thrust gap. A method is also provided for assembling a spindle motor using a press fit of a counter plate to a journal. The counter plate having a chamfer for reducing unwanted translation of the counter plate into a thrust gap. Also, the apparatus employed for the above methods are described.Type: GrantFiled: March 2, 1995Date of Patent: September 16, 1997Assignee: Seagate Technology, Inc.Inventors: Norbert Steven Parsoneault, Hans Leuthold, David John Jennings, Samnathan Murthy