Patents Represented by Attorney Darren Gold
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Patent number: 8133530Abstract: One-sided magnetic media for a hard disk drive. Methods are implemented to create a magnetic media with only one surface capable of recording data. The second surface is a non-data recording side of the media and is constructed so that it does not interfere with the recording properties of the recording side or the structural usefulness of the media. Additionally, the second surface can be a low quality surface capable of limited magnetic recording.Type: GrantFiled: July 22, 2008Date of Patent: March 13, 2012Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Shanlin Duan, Kenneth Johnson, Owen Melroy
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Patent number: 7943558Abstract: Lubricant with non-terminal functional groups. The location of the functional groups minimizes free chain length and molecular weight of a lubricant while simultaneously maximizing evaporation temperature. The locations of the functional groups to the backbone of the molecule of the lubricant allows for shorter lengths of free backbone length between functional groups attached to a lubricated surface. The lubricant lubricates mechanical devices including hard disk drives.Type: GrantFiled: December 14, 2009Date of Patent: May 17, 2011Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: John Martin Burns, Malika D. Carter, Xing-Cai Guo, Bruno Marchon, Robert Waltman
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Patent number: 7879467Abstract: Improvements to magnetic recording device including magnetic recording media are described. The improvements include the addition of copper to the recording layer as well as improved underlayers. In addition, improved manufacturing processes and magnetic/recording properties for media through heating and oxidation are described.Type: GrantFiled: December 14, 2009Date of Patent: February 1, 2011Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Jack Chang, Mohammad Mirzamaani, Kai Tang
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Patent number: 7880998Abstract: Two pass writing system and method for patterned media. In a first step, a write head of a hard disk drive writes with a strong write field. In a second step, a write head of the hard disk drive writes with a weak field. In this manner, magnetic islands of patterned media are written in the first step. In the second step, only those magnetic islands with a low switching field are written.Type: GrantFiled: December 21, 2007Date of Patent: February 1, 2011Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventor: Xiao Z. Wu
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Patent number: 7862913Abstract: An improved structure for the construction of perpendicular recording media is disclosed. The structure includes a perpendicular recording layer with at least two oxide sublayers or a lower sublayer of a non-oxide. One structure includes an upper sublayer comprised of a Silicon-oxide, while a lower sublayer is comprised of a Tantalum-oxide. The structures provide for increased coercivity and corrosion resistance.Type: GrantFiled: October 23, 2006Date of Patent: January 4, 2011Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Xiaoping Bian, Qing Dai, Hoa Do, Yoshihiro Ikeda, David Margulies, Mary Frances Minardi, Natacha Frederique Supper, Kentaro Takano, Min Xiao, Qi-Fan Xiao
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Patent number: 7715137Abstract: Servo patterns for patterned media. The servo pattern includes specification of cylinder/track ID with and without a Gray code. The servo pattern space is minimized by the optimum usage of the islands. This is achieved by island allocation rules to take advantage of non-magnetic island. The island allocation also provides for easier lift-off. Logic is used to encode and decode the Gray code. Further, the Gray code is designed to stabilize the magnetic island/non-magnetic island ratio to allow for easier manufacture.Type: GrantFiled: October 19, 2006Date of Patent: May 11, 2010Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Thomas Robert Albrecht, Mario Blaum, Ksenija Lakovic, Bruce Alexander Wilson, Satoshi Yamamoto
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Patent number: 7683012Abstract: Lubricant with non-terminal functional groups. The location of the functional groups minimizes free chain length and molecular weight of a lubricant while simultaneously maximizing evaporation temperature. The locations of the functional groups to the backbone of the molecule of the lubricant allows for shorter lengths of free backbone length between functional groups attached to a lubricated surface. The lubricant lubricates mechanical devices including hard disk drives.Type: GrantFiled: September 12, 2005Date of Patent: March 23, 2010Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: John Martin Burns, Malika D. Carter, Xing-Cai Guo, Bruno Marchon, Robert Waltman
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Patent number: 7670694Abstract: Improvements to magnetic recording device including magnetic recording media are described. The improvements include the addition of copper to the recording layer as well as improved underlayers. In addition, improved manufacturing processes and magnetic/recording properties for media through heating and oxidation are described.Type: GrantFiled: December 22, 2006Date of Patent: March 2, 2010Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Jack Chang, Mohammad Mirzamaani, Kai Tang
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Patent number: 7463502Abstract: A three-dimensional solid-state memory is formed from a plurality of bit lines, a plurality of layers, a plurality of tree structures and a plurality of plate lines. Bit lines extend in a first direction in a first plane. Each layer includes an array of memory cells, such as ferroelectric or hysteretic-resistor memory cells. Each tree structure corresponds to a bit line, has a trunk portion and at least one branch portion. The trunk portion of each tree structure extends from a corresponding bit line, and each tree structure corresponds to a plurality of layers. Each branch portion corresponds to at least one layer and extends from the trunk portion of a tree structure. Plate lines correspond to at least one layer and overlap the branch portion of each tree structure in at least one row of tree structures at a plurality of intersection regions.Type: GrantFiled: October 15, 2007Date of Patent: December 9, 2008Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventor: Barry Cushing Stipe
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Patent number: 7394730Abstract: A method for patterning a recording medium selectively thermally couples a recording medium and a heat source to alter a chemical composition of the recording medium. An apparatus for patterning a recording medium has a heat source for generating and directing an incident thermal wave to a recording medium so as to alter a chemical composition of the recording medium, and a controller for coordinating a mutual position of the incident thermal wave and the recording medium for inducing a direct thermal coupling between the recording medium and the heat source.Type: GrantFiled: October 19, 2006Date of Patent: July 1, 2008Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Ernesto E. Marinero, Hermantha K. Wickramasinghe
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Patent number: 6985317Abstract: The present invention provides a method, apparatus and program product for testing the reliability of a disk drive. The head-to-disk clearance of a disk drive is measured at different slider airbearing conditions. The change in head-to-disk clearance between the slider airbearing conditions is calculated. If the calculated head-to-disk clearance change between airbearing conditions for each of the heads in the disk drive exceeds a predetermined threshold, the disk drive is verified as having passed the reliability test. Differences in slider airbearing conditions are generated by varying pressures and/or temperatures under which the drive is operated.Type: GrantFiled: May 2, 2002Date of Patent: January 10, 2006Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: William Harlow McConnell, Molly Smith, legal representative, Gordon James Smith