Patents by Inventor Djohni Chandra

Djohni Chandra 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).

  • Patent number: 7686871
    Abstract: An integrated filter assembly is provided. The filter assembly includes a fastener that holds two substantially opposing elements of a housing together. Also included is a multi-purpose filter that has at least a particle filter component and a chemical filter component. The multi-purpose filter is attached to the fastener. The multi-purpose filter is within the housing when the fastener holds the two substantially opposing elements of the housing together.
    Type: Grant
    Filed: May 2, 2006
    Date of Patent: March 30, 2010
    Assignee: Seagate Technology LLC
    Inventors: CheeFong Oh, LiHong Zhang, Djohni Chandra
  • Patent number: 7529054
    Abstract: A method, and system configured to implement the method, are provided. The method includes the steps of identifying a last usable track on a surface as a function of a parameter, and defining a standoff band of tracks relative to the last usable track to obtain an achieved maximum track on the surface. The last usable track is, in exemplary embodiments, a track beyond a default maximum track on a surface of a data storage medium.
    Type: Grant
    Filed: April 15, 2004
    Date of Patent: May 5, 2009
    Assignee: Seagate Technology LLC
    Inventors: Jimmy TzeMing Pang, UttHeng Kan, Djohni Chandra, KokHoe Chia
  • Publication number: 20070256396
    Abstract: An integrated filter assembly is provided. The filter assembly includes a fastener that holds two substantially opposing elements of a housing together. Also included is a multi-purpose filter that has at least a particle filter component and a chemical filter component. The multi-purpose filter is attached to the fastener. The multi-purpose filter is within the housing when the fastener holds the two substantially opposing elements of the housing together.
    Type: Application
    Filed: May 2, 2006
    Publication date: November 8, 2007
    Applicant: Seagate Technology LLC
    Inventors: CheeFong Oh, LiHong Zhang, Djohni Chandra
  • Patent number: 7130150
    Abstract: An apparatus for mitigating particle and aerosol contaminants from an internal environment of a data storage device is disclosed. The apparatus includes a base, a breather diffusion path formed in the base, a re-circulating filter channel adjacent the base, and an absorption filter chamber adjacent the re-circulating filter channel and communicating with the breather diffusion path. A breather filter removes particulates from air migrating through the diffusion path. The length and diameter of the diffusion path precludes transfer of humidity from the external environment of the data storage device to the internal environment of the data storage device. A re-circulating filter spans the re-circulating filter channel and removes particulates from airstreams passing through the re-circulating filter channel, and a substantially carbon based absorption filter extracts corrosive gases and organic vapors from the internal environment of the data storage device.
    Type: Grant
    Filed: July 29, 2003
    Date of Patent: October 31, 2006
    Assignee: Seagate Technology LLC
    Inventors: Quock Ying Ng, Yiren Hong, JingShi Goh, Niroot Jierapipantanakul, Djohni Chandra
  • Patent number: 7119978
    Abstract: A motion control system has an enclosed assembly that encloses moving parts. A controller controls a motion of the moving parts and has an inhibit input that inhibits the motion. A sensor provides sensor outputs that depend on an assembly temperature and an assembly humidity in the enclosed assembly. A circuit provides a condensing condition output as a function of the sensor outputs. The condensing condition output couples to the inhibit input to inhibit the motion as a function of the sensor outputs.
    Type: Grant
    Filed: June 2, 2004
    Date of Patent: October 10, 2006
    Assignee: Seagate Technology LLC
    Inventors: Chew WengKhin Victor, David KokLeong Loh, Gan Kah Liang, Djohni Chandra, Myint Ngwe
  • Publication number: 20060079103
    Abstract: A thin connector having generally opposing surfaces, one of which can be arranged facing a device, while the other presents conductive elements away from the device.
    Type: Application
    Filed: June 1, 2005
    Publication date: April 13, 2006
    Inventors: Chor Cheng, Choon Lim, Niroot Jierapipatanakul, Djohni Chandra
  • Publication number: 20050270679
    Abstract: A motion control system has an enclosed assembly that encloses moving parts. A controller controls a motion of the moving parts and has an inhibit input that inhibits the motion. A sensor provides sensor outputs that depend on an assembly temperature and an assembly humidity in the enclosed assembly. A circuit provides a condensing condition output as a function of the sensor outputs. The condensing condition output couples to the inhibit input to inhibit the motion as a function of the sensor outputs.
    Type: Application
    Filed: June 2, 2004
    Publication date: December 8, 2005
    Inventors: Chew Victor, David Loh, Gan Liang, Djohni Chandra, Myint Ngwe
  • Publication number: 20050231842
    Abstract: A method, and system configured to implement the method, are provided. The method includes the steps of identifying a last usable track on a surface as a function of a parameter, and defining a standoff band of tracks relative to the last usable track to obtain an achieved maximum track on the surface. The last usable track is, in exemplary embodiments, a track beyond a default maximum track on a surface of a data storage medium.
    Type: Application
    Filed: April 15, 2004
    Publication date: October 20, 2005
    Inventors: Jimmy Pang, UttHeng Kan, Djohni Chandra, KokHoe Chia
  • Publication number: 20050024763
    Abstract: An apparatus for mitigating particle and aerosol contaminants from an internal environment of a data storage device is disclosed. The apparatus includes a base, a breather diffusion path formed in the base, a re-circulating filter channel adjacent the base, and an absorption filter chamber adjacent the re-circulating filter channel and communicating with the breather diffusion path. A breather filter removes particulates from air migrating through the diffusion path. The length and diameter of the diffusion path precludes transfer of humidity from the external environment of the data storage device to the internal environment of the data storage device. A re-circulating filter spans the re-circulating filter channel and removes particulates from airstreams passing through the re-circulating filter channel, and a substantially carbon based absorption filter extracts corrosive gases and organic vapors from the internal environment of the data storage device.
    Type: Application
    Filed: July 29, 2003
    Publication date: February 3, 2005
    Inventors: Quock Ng, Yiren Hong, JingShi Goh, Niroot Jierapipantanakul, Djohni Chandra
  • Patent number: 6822821
    Abstract: A head crash in a hard disc drive is predicted by periodically measuring a head-disc contact energy level on an actuator arm supporting the head and identifying a predetermined change in the energy level between at least two energy level measurements. The head-disc contact energy level is measured by a positioning microactuator on the actuator arm, and comparing that energy level to a threshold established during an earlier or selected contact start-stop cycle. A circuit is coupled to the microactuator and is periodically operable to identify a magnitude of contact energy. An indicator is coupled to the circuit and responsive to the representations to indicate presence of symptoms of an impending crash.
    Type: Grant
    Filed: September 20, 2001
    Date of Patent: November 23, 2004
    Assignee: Seagate Technology LLC
    Inventors: Samuel SweeChuan Gan, MuiChong Chai, Terang KongBeng Thia, Djohni Chandra, Sanh Tran
  • Publication number: 20020097516
    Abstract: A head crash in a hard disc drive is predicted by periodically measuring a head-disc contact energy level on an actuator arm supporting the head and identifying a predetermined change in the energy level between at least two energy level measurements. The head-disc contact energy level is measured by a positioning microactuator on the actuator arm, and comparing that energy level to a threshold established during an earlier or selected contact start-stop cycle. A circuit is coupled to the microactuator and is periodically operable to identify a magnitude of contact energy. An indicator is coupled to the circuit and responsive to the representations to indicate presence of symptoms of an impending crash.
    Type: Application
    Filed: September 20, 2001
    Publication date: July 25, 2002
    Inventors: Samuel SweeChuan Gan, MuiChong Chai, Terang KongBeng Thia, Djohni Chandra, Sanh Tran