Patents by Inventor Thomas Edward Karis
Thomas Edward Karis 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: 9728220Abstract: Embodiments disclosed herein generally relate to magnetic recording systems having a spindle motor and, more particularly, to an optimized lubricant for bearings within the spindle motor. A lubricant used in a fluid dynamic bearing motor has an antioxidant additive and a charge control agent dissolved in a diester base oil. The charge control agent is chemically attached to the same diacid reactant used in the diester lubricant base oil, and is prepared through an esterification reaction. The charge control agent is then dissolved in the lubricant base oil. The charge control agent is soluble in the lubricant, and is resistant to free radical oxidation. The charge control agent effectively controls the charge of the lubricant by creating electron donor/acceptor sites in the lubricant, facilitating an independent electronic pathway through the lubricant.Type: GrantFiled: May 18, 2016Date of Patent: August 8, 2017Assignee: Western Digital Technologies, Inc.Inventor: Thomas Edward Karis
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Publication number: 20160260453Abstract: Embodiments disclosed herein generally relate to magnetic recording systems having a spindle motor and, more particularly, to an optimized lubricant for bearings within the spindle motor. A lubricant used in a fluid dynamic bearing motor has an antioxidant additive and a charge control agent dissolved in a diester base oil. The charge control agent is chemically attached to the same diacid reactant used in the diester lubricant base oil, and is prepared through an esterification reaction. The charge control agent is then dissolved in the lubricant base oil. The charge control agent is soluble in the lubricant, and is resistant to free radical oxidation. The charge control agent effectively controls the charge of the lubricant by creating electron donor/acceptor sites in the lubricant, facilitating an independent electronic pathway through the lubricant.Type: ApplicationFiled: May 18, 2016Publication date: September 8, 2016Inventor: Thomas Edward KARIS
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Patent number: 9368150Abstract: Embodiments disclosed herein generally relate to magnetic recording systems having a spindle motor and, more particularly, to an optimized lubricant for bearings within the spindle motor. A lubricant used in a fluid dynamic bearing motor has an antioxidant additive and a charge control agent dissolved in a diester base oil. The charge control agent is chemically attached to the same diacid reactant used in the diester lubricant base oil, and is prepared through an esterification reaction. The charge control agent is then dissolved in the lubricant base oil. The charge control agent is soluble in the lubricant, and is resistant to free radical oxidation. The charge control agent effectively controls the charge of the lubricant by creating electron donor/acceptor sites in the lubricant, facilitating an independent electronic pathway through the lubricant.Type: GrantFiled: September 24, 2014Date of Patent: June 14, 2016Assignee: HGST NETHERLANDS B.V.Inventor: Thomas Edward Karis
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Publication number: 20160086631Abstract: Embodiments disclosed herein generally relate to magnetic recording systems having a spindle motor and, more particularly, to an optimized lubricant for bearings within the spindle motor. A lubricant used in a fluid dynamic bearing motor has an antioxidant additive and a charge control agent dissolved in a diester base oil. The charge control agent is chemically attached to the same diacid reactant used in the diester lubricant base oil, and is prepared through an esterification reaction. The charge control agent is then dissolved in the lubricant base oil. The charge control agent is soluble in the lubricant, and is resistant to free radical oxidation. The charge control agent effectively controls the charge of the lubricant by creating electron donor/acceptor sites in the lubricant, facilitating an independent electronic pathway through the lubricant.Type: ApplicationFiled: September 24, 2014Publication date: March 24, 2016Applicant: HGST NETHERLANDS B.V.Inventor: Thomas Edward KARIS
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Patent number: 9266258Abstract: A system, method and apparatus for manufacturing high density magnetic media is disclosed. A flexible mold having a very low modulus of less than about 4 GPa is made on a rigid support. The mold nano-imprints a resist material on disks for hard disk drives. The flexible mold may comprise a perfluoropolyether with urethane acrylate end groups with a low surface adhesion from which the cured resist is easily released.Type: GrantFiled: October 28, 2014Date of Patent: February 23, 2016Assignee: HGST NETHERLANDS B.V.Inventors: Clayton P. Henderson, Tsai-Wei Wu, Xing-Cai Guo, Thomas Edward Karis, Jeffrey S. Lille
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Publication number: 20150044321Abstract: A system, method and apparatus for manufacturing high density magnetic media is disclosed. A flexible mold having a very low modulus of less than about 4 GPa is made on a rigid support. The mold nano-imprints a resist material on disks for hard disk drives. The flexible mold may comprise a perfluoropolyether with urethane acrylate end groups with a low surface adhesion from which the cured resist is easily released.Type: ApplicationFiled: October 28, 2014Publication date: February 12, 2015Inventors: Clayton P. Henderson, Tsai-Wei Wu, Xing-Cai GUO, Thomas Edward KARIS, Jeffrey S. LILLE
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Patent number: 7998913Abstract: Additives that inhibit the passage of oil across oil-air interfaces in disk drives and enable the use of the lower viscosity oil in disk drives are disclosed. Mass transfer of oil from the bulk liquid oil into the vapor phase takes place by oil molecules evaporating from the oil-air interface, or collections of oil molecules being ejected from the oil-air interface as aerosol. The invention reduces mass transfer across the oil-air interface through the use of oil-soluble surfactants.Type: GrantFiled: June 11, 2007Date of Patent: August 16, 2011Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Ferdinand Hendriks, Thomas Edward Karis, Kunihiro Shida
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Publication number: 20100221416Abstract: The manufacturing processes of lubrication and final tape polish (FTP) for magnetic media are combined into a single operation. A modified disk loading conveyor performs both lubricant dipping and FTP by immersing a cassette of disks in a lube bath. A single disk is lubed as it is unloaded. Upon unload, the lubed disk is put on an FTP spindle for polishing. After FTP, the disk is put in an empty cassette adjacent the lube bath. An automatic lift transports fill or empty cassettes into or out of the lube bath, respectively.Type: ApplicationFiled: February 27, 2009Publication date: September 2, 2010Applicant: HITACHI GLOBAL STORAGE TECHNOLOGIES NETHERLANDS BVInventors: Xing-Cai Guo, Thomas Edward Karis
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Publication number: 20080304177Abstract: Additives that inhibit the passage of oil across oil-air interfaces in disk drives and enable the use of the lower viscosity oil in disk drives are disclosed. Mass transfer of oil from the bulk liquid oil into the vapor phase takes place by oil molecules evaporating from the oil-air interface, or collections of oil molecules being ejected from the oil-air interface as aerosol. The invention reduces mass transfer across the oil-air interface through the use of oil-soluble surfactants.Type: ApplicationFiled: June 11, 2007Publication date: December 11, 2008Inventors: Ferdinand Hendriks, Thomas Edward Karis, Kunihiro Shida
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Patent number: 6643093Abstract: The magnetic surfaces of the magnetoresistive or magnetic tunnel junction and inductive write head and magnetic recording disk of a hard disk drive are protected from corrosion by inserting a vapor phase corrosion inhibitor (VPCI) package into the disk drive for providing additives in the vapor phase of the disk drive enclosure to maintain an equilibrium and renewable adsorbed film of metal passivators on the head and disk surfaces. The VPCI package includes at least one vapor phase corrosion inhibitor (VPCI) embedded in a polymeric matrix.Type: GrantFiled: January 15, 2002Date of Patent: November 4, 2003Assignee: Hitachi Global Storage Technologies Netherlands, B.V.Inventors: Charles Allan Brown, Richard Anthony DiPietro, Thomas Edward Karis, Herman Russell Wendt, Run-Han Wang
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Publication number: 20030142438Abstract: The magnetic surfaces of the magnetoresistive or magnetic tunnel junction and inductive write head and magnetic recording disk of a hard disk drive are protected from corrosion by inserting a vapor phase corrosion inhibitor (VPCI) package into the disk drive for providing additives in the vapor phase of the disk drive enclosure to maintain an equilibrium and renewable adsorbed film of metal passivators on the head and disk surfaces. The VPCI package includes at least one vapor phase corrosion inhibitor (VPCI) embedded in a polymeric matrix.Type: ApplicationFiled: January 15, 2002Publication date: July 31, 2003Inventors: Charles Allan Brown, Richard Anthony DiPietro, Thomas Edward Karis, Herman Russell Wendt, Run-Han Wang
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Patent number: 6194360Abstract: The invention relates to a magnetic recording data storage device which can operate effectively at high rotational speeds. The magnetic recording device of the present invention comprises (a) a magnetic recording disk, (b) a spindle motor, (c) a head supported on an air bearing carrier, and (d) an actuator connected to the head carrier for moving the head across the rotating disk. The spindle motor comprises ball bearings lubricated by a grease comprising a polymeric amine and bis or tris (alkyl phenyl)phosphate. The grease improves rotational operation of the disk drive.Type: GrantFiled: December 22, 1998Date of Patent: February 27, 2001Assignee: International Business Machines CorporationInventors: Thomas Edward Karis, Holavanahally S. Nagaraj
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Patent number: 5940247Abstract: A magnetic recording data storage device includes a magnetic recording disk, a spindle motor, a head supported on an air bearing carrier and an actuator connected to the head carrier for moving the head across the rotating disk. The spindle motor has lubricant covered ball bearings where the lubricant includes an alkali hydroxystearate, an ester oil, a dialkyldiphenylamine and a dialkyldithiocarbamate.Type: GrantFiled: March 26, 1997Date of Patent: August 17, 1999Assignee: International Business Machines CorporationInventors: Thomas Edward Karis, Holavanahally Seshachar Nagaraj
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Patent number: 5886854Abstract: An improved disk drive system using a non-ferrofluid conductive lubricant is disclosed. In the disk drive system, there is a plurality of critically spaced magnetic disks rotated by a disk motor. A spindle shaft, which is retained by the spindle sleeve, couples to the disk motor and to the plurality of magnetic disks for rotation. The spindle shaft and spindle sleeve uses a bearing, which is lubricated by a non-ferrofluid conductive lubricant. The lubricant is used to prevent electrostatic charge build up during operation of the disk drive system. The lubricant may be either a non-polar oil or a ball bearing grease and further having either a metal caged fullerenes compound, STADIS-450, ASA-3, or Polyfloe 130. One particular type of lubricant is an emeraldine salt of polyanilin produced according to the steps of first reacting a solution of HCL and ammonium persulfate into a solution of HCL and analine to form a polymer.Type: GrantFiled: July 9, 1996Date of Patent: March 23, 1999Assignee: International Business Machines CorporationInventors: Arthur Fred Diaz, Robert D. Johnson, Thomas Edward Karis, Holavanahally S. Nagaraj, My Thanh Nguyen
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Patent number: 5744431Abstract: An improved disk drive system using a non-ferrofluid conductive lubricant is disclosed. In the disk drive system, there is a plurality of critically spaced magnetic disks rotated by a disk motor. A spindle shaft, which is retained by the spindle sleeve, couples to the disk motor and to the plurality of magnetic disks for rotation. The spindle shaft and spindle sleeve uses a bearing, which is lubricated by a non-ferrofluid conductive lubricant. The lubricant is used to prevent electrostatic charge build up during operation of the disk drive system. The lubricant may be either a non-polar oil or a ball bearing grease and further comprising either a metal caged fullerenes compound, STADIS-450, ASA-3, or Polyfloe 130. One particular type of lubricant is an emeraldine salt of polyanilin produced according to the steps of first reacting a solution of HCL and ammonium persulfate into a solution of HCL and analine to form a polymer.Type: GrantFiled: November 15, 1996Date of Patent: April 28, 1998Assignee: International Business Machines CorporationInventors: Arthur Fred Diaz, Robert D. Johnson, Thomas Edward Karis, Holayanahally S. Nagaral, My Thanh Nguyen
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Patent number: 5641841Abstract: An improved disk drive system using a non-ferrofluid conductive lubricant is disclosed. In the disk drive system, there is a plurality of critically spaced magnetic disks rotated by a disk motor. A spindle shaft, which is retained by the spindle sleeve, couples to the disk motor and to the plurality of magnetic disks for rotation. The spindle shaft and spindle sleeve uses a bearing, which is lubricated by a non-ferrofluid conductive lubricant. The lubricant is used to prevent electrostatic charge build up during operation of the disk drive system. The lubricant may be either a non-polar oil or a ball bearing grease and further comprising either a metal caged fullerenes compound, STADIS-450, ASA-3, or Polyfloe 130. One particular type of lubricant is an emeraldine salt of polyanilin produced according to the steps of first reacting a solution of HCL and ammonium persulfate into a solution of HCL and analine to form a polymer.Type: GrantFiled: June 7, 1995Date of Patent: June 24, 1997Assignee: International Business Machines CorporationInventors: Arthur Fred Diaz, Robert D. Johnson, Thomas Edward Karis, Holavanahally S. Nagaral, My Thanh Nguyen