Patents by Inventor Bihari Lal
Bihari Lal 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: 9857000Abstract: A flexible pipe body and method of producing a flexible pipe body are disclosed. The flexible pipe body includes a collapse resistant layer comprising a radially inner surface and a radially outer surface, the radially inner surface comprising, in cross section, a substantially flat portion and at least one cavity extending from the flat portion radially outwards, and the radially inner surface further comprising, in cross section, at least one aerodynamic feature extending from the flat portion for breaking up a boundary layer of fluid flowing along the flexible pipe body in use.Type: GrantFiled: July 12, 2013Date of Patent: January 2, 2018Assignee: GE Oil & Gas UK LimitedInventors: Krishna Kant Agarwal, Bihari Lal, Senthamil Selvan
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Publication number: 20150167867Abstract: A flexible pipe body and method of producing a flexible pipe body are disclosed. The flexible pipe body includes a collapse resistant layer comprising a radially inner surface and a radially outer surface, the radially inner surface comprising, in cross section, a substantially flat portion and at least one cavity extending from the flat portion radially outwards, and the radially inner surface further comprising, in cross section, at least one aerodynamic feature extending from the flat portion for breaking up a boundary layer of fluid flowing along the flexible pipe body in use.Type: ApplicationFiled: July 12, 2013Publication date: June 18, 2015Applicant: GE OIL & GAS UK LIMITEDInventors: Krishna Kant Agarwal, Bihari Lal, Senthamil Selvan
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Patent number: 6303217Abstract: A magnetic recording medium having a dual underlayer structure is described. The underlayer structure is composed of a first underlayer of chromium and a second underlayer of a chromium alloy.Type: GrantFiled: October 2, 1998Date of Patent: October 16, 2001Assignee: HMT Technology, CorporationInventors: Sudhir S. Malhotra, Brij Bihari Lal, Michael A. Russak
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Patent number: 6210819Abstract: A longitudinal magnetic recording medium having a CrTi underlayer deposited under a substrate bias is described. The medium has improved magnetic recording properties.Type: GrantFiled: July 24, 1998Date of Patent: April 3, 2001Assignee: HMT Technology CorporationInventors: Brij Bihari Lal, Lan Zhang
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Patent number: 6146737Abstract: A magnetic recording medium having a barrier layer deposited directly on the magnetic recording layer is described. The barrier layer is deposited by sputter deposition under a nitrogen-containing sputtering atmosphere to form a nitrogen-containing chromium or chromium alloy barrier layer. The barrier layer is effective to inhibit migration of cobalt from the underlying magnetic recording layer, reducing corrosion of the medium and improving magnetic recording performance.Type: GrantFiled: September 18, 1998Date of Patent: November 14, 2000Assignee: HMT Technology CorporationInventors: Sudhir S. Malhotra, Brij Bihari Lal, James L. Chao, Michael A. Russak
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Patent number: 6007924Abstract: An improvement in a magnetic recording medium having an underlayer and first and second magnetic recording layers is described. The improvement, effective to reduce media noise, includes deposition of an interlayer between the first and second magnetic recording layers. The interlayer is deposited to a thickness of between 5-50 .ANG. and is composed of an CoCr-based alloy having a defined saturation magnetization.Type: GrantFiled: July 2, 1997Date of Patent: December 28, 1999Assignee: HMT Technology CorporationInventors: Brij Bihari Lal, Sudhir S. Malhotra, Michael A. Russak
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Patent number: 5922442Abstract: An improvement in a magnetic recording medium having an underlayer and a magnetic layer is described. The improvement, effective to increase the coercivity of the medium, includes deposition of an interlayer between the underlayer and the magnetic recording layer. The interlayer is deposited to a thickness of between 10-60 .ANG. and is composed of an CoCr-based alloy having a defined saturation magnetization.Type: GrantFiled: March 28, 1997Date of Patent: July 13, 1999Assignee: HMT Technology CorporationInventors: Brij Bihari Lal, Sudhir S. Malhotra, Michael A. Russak
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Patent number: 5849386Abstract: An improvement in a magnetic recording medium having an underlayer and a magnetic recording layer is described. The improvement, effective to reduce media anisotropy, includes deposition of a prelayer on the substrate, prior to deposition of the underlayer. The prelayer is deposited to a thickness of between 10-60 .ANG. and is composed of an CoCr-based alloy having a defined saturation magnetization.Type: GrantFiled: August 7, 1997Date of Patent: December 15, 1998Assignee: HMT Technology CorporationInventors: Brij Bihari Lal, Sudhir S. Malhotra, Michael A. Russak
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Patent number: 5834111Abstract: A bilayer magnetic recording medium having first and second magnetic recording layers separated by a nonmagnetic isolation layer is disclosed. The medium is characterized by a high coercivity, low noise and an improved overwrite. In producing the medium, the second magnetic layer is deposited under sputtering conditions effective to produce a higher coercivity.Type: GrantFiled: May 31, 1994Date of Patent: November 10, 1998Assignee: HMT Technology CorporationInventors: Brij Bihari Lal, Tadashi Shinohara
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Patent number: 5744253Abstract: A magnetic thin-film medium characterized by high coercivity, loop squareness, and signal-to-noise ratio characteristics. The medium includes a disc-like substrate, a sputtered Cr underlayer having a thickness between 100-300 .ANG., and a sputtered Co alloy magnetic thin-film layer having a thickness between 250-800 .ANG.. The sputtered Cr and magnetic layers are preferably formed under sputtering conditions in which a negative bias of between -50 to -600 volts is applied to the substrate.Type: GrantFiled: October 22, 1992Date of Patent: April 28, 1998Assignee: HMT Technology CorporationInventors: Brij Bihari Lal, Tadashi Shinohara
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Patent number: 5736020Abstract: A target assembly for use in forming a protective overcoat in a magnetic recording medium is described. The assembly includes a centrally positioned target with inner and outer magnetic means adjacent the target. A sputtering shield is positioned between the target and the medium for controlling the amount and angle of material deposition on the medium. The assembly is effective to deposit an overcoat having a greater thickness in the inner landing zone of the medium than in the outer data zone. A method of using the assembly is also disclosed.Type: GrantFiled: December 19, 1995Date of Patent: April 7, 1998Assignee: HMT Technology CorporationInventors: Brij Bihari Lal, Allen J. Bourez, Michael A. Russak
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Patent number: 5714044Abstract: A method for forming an overcoat having first and second layers in a magnetic recording medium is described. The first overcoat layer is deposited in a first sputtering chamber where the magnetic means for confining target plasma in the chamber are oriented to retain magnetic-field confinement about the target surface and to produce magnetic field lines between directly confronting portions of the confronting sputtering targets. The second overcoat layer is deposited under a nitrogen-containing atmosphere.Type: GrantFiled: August 7, 1995Date of Patent: February 3, 1998Assignee: HMT Technology CorporationInventors: Brij Bihari Lal, Allen J. Bourez, Michael A. Russak
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Patent number: 5693197Abstract: A method of producing a magnetic recording medium by sputtering a layer onto a substrate by DC-magnetron sputtering from a target while exposing the target to an RF signal is described. The RF signal is effective to extend the target utilization without significantly decreasing the sputtering rate. Also disclosed is an apparatus for use forming a medium in accordance with the method of the invention.Type: GrantFiled: October 6, 1994Date of Patent: December 2, 1997Assignee: HMT Technology CorporationInventors: Brij Bihari Lal, Allen J. Bourez, Tadashi Shinohara
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Patent number: 5693199Abstract: A sputtering assembly for use in forming sputter deposited layers on a substrate is described. The assembly includes a pair of confronting sputtering targets for depositing sputtered layers onto the substrate and a movably mounted heating means for heating the substrate. A method of using the assembly is also disclosed.Type: GrantFiled: July 24, 1996Date of Patent: December 2, 1997Assignee: HMT Technology CorporationInventors: Allen J. Bourez, Brij Bihari Lal, Michael A. Russak
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Patent number: 5693198Abstract: A method for forming a magnetic recording medium having a chromium underlayer and a magnetic recording layer is described. The method includes sputtering the underlayer and the magnetic layer in a single sputtering chamber from a two-region target having an inner chromium region and an outer magnetic region. Each target region is successively energized for sputter deposition of each layer.Type: GrantFiled: January 13, 1995Date of Patent: December 2, 1997Assignee: HMT Technology CorporationInventors: Brij Bihari Lal, Tadashi Shinohara
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Patent number: 5685959Abstract: A cathode assembly having a magnetic-field shunt for use in a magnetron sputtering apparatus is described. The magnetic-field shunt disposed between a sputtering target and a source of magnetic flux, and the shunt is moveable between first and second positions to effect preferential target erosion at first and second target regions, respectively. A method of using the assembly for preparation of a magnetic recording medium is also described.Type: GrantFiled: October 25, 1996Date of Patent: November 11, 1997Assignee: HMT Technology CorporationInventors: Allen J. Bourez, Brij Bihari Lal, Michael A. Russak