Patents by Inventor Ming Mao

Ming Mao 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: 8970988
    Abstract: A method and system provide a magnetic transducer having an air-bearing surface (ABS) and at least two read sensors. The magnetic transducer also includes a first read shield, a first read sensor, a middle shield, a second read sensor, a second read shield, a first electric gap and a second electric gap. The first read sensor is in a down track direction from the first read shield. The middle shield is in a down track direction from the first read sensor. The middle shield is between the first read sensor and the second read sensor. A first portion of the first electric gap is in a direction opposite to the down track direction from the first read sensor. The first read sensor and the second read sensor are between the first electric gap and the second electric gap in a cross-track direction.
    Type: Grant
    Filed: April 15, 2014
    Date of Patent: March 3, 2015
    Assignee: Western Digital (Fremont), LLC
    Inventors: Shaoping Li, Gerardo A. Bertero, Changhe Shang, Ge Yi, Steven C. Rudy, Guolun Hao, Qunwen Leng, Shihai He, Yingbo Zhang, Ming Mao, Lien-Chang Wang
  • Patent number: 8883017
    Abstract: A method and system provide a substantially seamless interface in a magnetic transducer. The magnetic recording transducer includes a first layer and a second layer on the first layer. The second layer is different from the first layer. The first layer consists of at least one material. The method includes removing at least the second layer using a first removal process. A residue of the second layer and a first portion of the first layer remain after the first removal process. A first sacrificial layer consists of the at least one material on the first portion of the first layer. At least the first sacrificial layer is removed using a second removal process. A second portion of the first layer remains after completion of the second removal process. An additional structure is provided. The seamless interface is between the second portion of the first layer and the additional structure.
    Type: Grant
    Filed: March 12, 2013
    Date of Patent: November 11, 2014
    Assignee: Western Digital (Fremont), LLC
    Inventors: Zhihong Zhang, Guanxiong Li, Ming Mao
  • Patent number: 8798065
    Abstract: Packet processing is provided in a multiple processor system including a first processor to processing a packet and to create a tag associated with the packet. The tag includes information about the processing of the packet. A second processor receives the packet subsequent to the first processor and processes the packet using the tag information.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: August 5, 2014
    Assignee: Juniper Networks, Inc.
    Inventors: Nir Zuk, Yu Ming Mao
  • Patent number: 8760823
    Abstract: A method and system provide a magnetic transducer having an air-bearing surface (ABS). The magnetic transducer includes a first shield, a read sensor, at least one soft magnetic bias structure and at least one hard bias structure. The read sensor includes a sensor layer that has at least one edge in the track width direction along the ABS. The soft magnetic bias structure(s) are adjacent to the edge(s) of the sensor layer. The soft magnetic bias structure has a first permeability. The soft bias structure(s) are between the read sensor and the hard bias structure(s). The hard bias structure(s) are adjacent to a portion of the soft bias structure(s) and have a second permeability. The first permeability is at least ten multiplied by the second permeability.
    Type: Grant
    Filed: December 20, 2011
    Date of Patent: June 24, 2014
    Assignee: Western Digital (Fremont), LLC
    Inventors: Laurence L. Chen, Anup G. Roy, Yunfei Ding, Ming Mao, Amritpal S. Rana, Daniele Mauri
  • Patent number: 8760822
    Abstract: A method and system provide a magnetic transducer having an air-bearing surface (ABS). The magnetic transducer includes a first shield, a read sensor, at least one soft magnetic bias structure and a second shield. The read sensor includes a sensor layer, a pinned layer and edge(s). The sensor layer has a first stripe height in a stripe height direction perpendicular to the ABS. The pinned layer has a second stripe height in the stripe height direction. The second stripe height is greater than the first stripe height. The soft magnetic bias structure(s) are adjacent to the edge(s) of the sensor. A portion of the soft magnetic bias structure(s) is further from the ABS than the first stripe height. The read sensor is between the first shield and the second shield. The soft magnetic bias structure(s) extend to the second shield.
    Type: Grant
    Filed: November 28, 2012
    Date of Patent: June 24, 2014
    Assignee: Western Digital (Fremont), LLC
    Inventors: Guanxiong Li, Ming Mao, Chih-Ching Hu
  • Patent number: 8711528
    Abstract: A tunnel magnetoresistance (TMR) read sensor having a tabbed AFM layer and an extended pinned layer and methods for making the same are provided. The TMR read sensor has an AFM layer recessed from the air bearing surface, providing a reduced shield-to-shield distance.
    Type: Grant
    Filed: June 29, 2012
    Date of Patent: April 29, 2014
    Assignee: Western Digital (Fremont), LLC
    Inventors: Rongfu Xiao, Guanxiong Li, Zhihong Zhang, Ming Mao, Chen-Jung Chien
  • Patent number: 8689316
    Abstract: Methods and apparatus for transferring packets in a packet switched communication system. A system is provided that includes an L2 device including a controller determining for each packet received whether the received packet is to be inspected, an inspection device operable to inspect and filter packets identified by the controller including using a zone specific policy and an L2 controller for transferring inspected packets in accordance with L2 header information using L2 protocols.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: April 1, 2014
    Assignee: Juniper Networks, Inc.
    Inventors: Yu Ming Mao, Roger Jia-Jyi Lian, Guangsong Huang, Lee Chik Cheung
  • Patent number: 8675318
    Abstract: A method and system for providing a read magnetic transducer having an air-bearing surface (ABS) is described. The magnetic read transducer includes a first shield, a read sensor stack, an antiferromagnetic (AFM) tab, and a second shield. The read sensor stack includes a pinned layer, a spacer layer, and a free layer. The spacer layer is nonmagnetic and between the pinned layer and the free layer. A portion of the read sensor stack is at the ABS. The AFM tab is recessed from the ABS and adjacent to a portion of the pinned layer. The read sensor resides between the first shield and the second shield.
    Type: Grant
    Filed: November 22, 2011
    Date of Patent: March 18, 2014
    Assignee: Western Digital (Fremont), LLC
    Inventors: Kuok San Ho, Savas Gider, Daniele Mauri, Ming Mao, Sining Mao
  • Patent number: 8631113
    Abstract: Methods and apparatuses for inspecting packets are provided. A primary security system may be configured for processing packets. The primary security system may be operable to maintain flow information for a group of devices to facilitate processing of the packets. A secondary security system may be designated for processing packets upon a failover event. Flow records may be shared from the primary security system with the secondary security system.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: January 14, 2014
    Assignee: Juniper Networks, Inc.
    Inventors: Nir Zuk, Yu Ming Mao, Kowsik Guruswamy
  • Patent number: 8630068
    Abstract: A method and system for providing a magnetic transducer having an air-bearing surface (ABS) is described. The magnetic read transducer includes a first shield, a magnetoresistive sensor, at least one soft magnetic side shield, and a second shield. The magnetoresistive sensor includes a sensor layer having at least one edge in the track width direction along the ABS. The at least one soft magnetic side shield is adjacent to the at least one edge of the sensor layer. The at least one soft magnetic side shield has a full film permeability of at least ten. The magnetoresistive sensor is between the first shield and the second shield and free of an in-stack hard bias layer.
    Type: Grant
    Filed: November 15, 2011
    Date of Patent: January 14, 2014
    Assignee: Western Digital (Fremont), LLC
    Inventors: Daniele Mauri, Chih-Ching Hu, Ming Mao, Kuok San Ho, Savas Gider
  • Patent number: 8611054
    Abstract: A magnetic read transducer is described with a magnetoresistive sensor that has a free layer, and an antiferromagnetically-coupled (AFC) soft bias layer for magnetically biasing the free layer. The free layer has a first edge in a track width direction along an air-bearing surface (ABS). At least a portion of the AFC soft bias layer is conformal to at least a portion of a second edge of the free layer, and situated to form a magnetic moment at an angle with respect to a center line of the free layer. The center line of the free layer extends in the same direction as the free layer first edge that is in the track width direction along the ABS.
    Type: Grant
    Filed: April 11, 2012
    Date of Patent: December 17, 2013
    Assignee: Western Digital (Fremont), LLC
    Inventors: Changhe Shang, Daniele Mauri, Kuok San Ho, Anup G. Roy, Ming Mao
  • Patent number: 8607438
    Abstract: A read sensor for a transducer is fabricated. The transducer has a field region and a sensor region corresponding to the sensor. A sensor stack is deposited. A hybrid mask including hard and field masks is provided. The hard mask includes a sensor portion covering the sensor region and a field portion covering the field region. The field mask covers the field portion of the hard mask. The field mask exposes the sensor portion of the hard mask and part of the sensor stack between the sensor and field regions. The sensor is defined from the sensor stack in a track width direction. Hard bias layer(s) are deposited. Part of the hard bias layer(s) resides on the field mask. Part of the hard bias layer(s) adjoining the sensor region is sealed. The field mask is lifted off. The transducer is planarized.
    Type: Grant
    Filed: December 1, 2011
    Date of Patent: December 17, 2013
    Assignee: Western Digital (Fremont), LLC
    Inventors: Wei Gao, Guanxiong Li, Ming Mao, Chih-Ching Hu, Guanghong Luo, Miao Wang, Zhihong Zhang, Anup G. Roy
  • Patent number: 8597528
    Abstract: A method and system for fabricating a magnetic transducer is described. A magnetic junction is defined from the magnetoresistive stack. The magnetic junction has a top and a plurality of sides. The step of defining the magnetic junction redeposits a portion of the magnetoresistive stack and forms fencing adjacent to the top of the magnetic junction. At least one hard bias structure is provided after the magnetic junction is defined. A first portion of the at least one hard bias structure is substantially adjacent to the magnetoresistive junction in a track-width direction. The magnetic junction is ion beam planarized, thereby substantially removing the fencing.
    Type: Grant
    Filed: March 30, 2011
    Date of Patent: December 3, 2013
    Assignee: Western Digital (Fremont), LLC
    Inventors: Anup G. Roy, Ming Mao
  • Patent number: 8547667
    Abstract: A method and system for providing a magnetic transducer is described. The method and system include providing a seed layer and providing at least one adjustment layer on the seed layer. The method and system also include providing a hard bias structure on the at least one adjustment layer. The seed layer has a first template including a first template dimension and a first texture. The at least one adjustment layer has a second template including a second template dimension and a second texture. The hard bias structure has a third template including a third template dimension and a third texture. The second template is between the first template and the third template.
    Type: Grant
    Filed: November 26, 2008
    Date of Patent: October 1, 2013
    Assignee: Western Digital (Fremont), LLC
    Inventors: Anup Ghosh Roy, Ming Mao, Mahendra Pakala
  • Publication number: 20130074184
    Abstract: Packet processing is provided in a multiple processor system including a first processor to processing a packet and to create a tag associated with the packet. The tag includes information about the processing of the packet. A second processor receives the packet subsequent to the first processor and processes the packet using the tag information.
    Type: Application
    Filed: September 14, 2012
    Publication date: March 21, 2013
    Applicant: JUNIPER NETWORKS, INC.
    Inventors: Nir Zuk, Yu Ming Mao
  • Publication number: 20130067268
    Abstract: Methods and apparatuses for inspecting packets are provided. A primary security system may be configured for processing packets. The primary security system may be operable to maintain flow information for a group of devices to facilitate processing of the packets. A secondary security system may be designated for processing packets upon a failover event. Flow records may be shared from the primary security system with the secondary security system.
    Type: Application
    Filed: September 14, 2012
    Publication date: March 14, 2013
    Applicant: JUNIPER NETWORKS, INC.
    Inventors: Nir ZUK, Yu Ming Mao, Kowsik Guruswamy
  • Publication number: 20130007839
    Abstract: Methods and apparatus for transferring packets in a packet switched communication system. A system is provided that includes an L2 device including a controller determining for each packet received whether the received packet is to be inspected, an inspection device operable to inspect and filter packets identified by the controller including using a zone specific policy and an L2 controller for transferring inspected packets in accordance with L2 header information using L2 protocols.
    Type: Application
    Filed: September 14, 2012
    Publication date: January 3, 2013
    Applicant: JUNIPER NETWORKS, INC.
    Inventors: Yu Ming MAO, Roger Jia-Jyi LIAN, Guangsong HUANG, Lee Chik CHEUNG
  • Patent number: 8343319
    Abstract: A method and system for providing a magnetic transducer is described. The method and system define a magnetoresistive sensor in a track width direction, provide hard bias material(s) adjacent to the sensor in the track width direction, and provide sacrificial capping layer(s) on a portion of the hard bias material(s). The sacrificial capping layer(s) have a first height in a stripe height direction. The method and system also provide a mask for defining a stripe height of the sensor. The mask covers at least part of the sensor and has a second height in the stripe height direction. The second height is less than the first height. The method and system define the stripe height of the sensor while the mask covers the sensor. The sacrificial capping layer(s) are configured to prevent removal of the portion of the hard bias material(s) while the stripe height is defined.
    Type: Grant
    Filed: September 25, 2008
    Date of Patent: January 1, 2013
    Assignee: Western Digital (Fremont), LLC
    Inventors: Guanxiong Li, Xiaohai Xiang, Ming Mao, Mahendra Pakala
  • Patent number: 8331374
    Abstract: Packet processing is provided in a multiple processor system including a first processor to processing a packet and to create a tag associated with the packet. The tag includes information about the processing of the packet. A second processor receives the packet subsequent to the first processor and processes the packet using the tag information.
    Type: Grant
    Filed: December 12, 2011
    Date of Patent: December 11, 2012
    Assignee: Juniper Networks, Inc.
    Inventors: Nir Zuk, Yu Ming Mao
  • Patent number: 8326961
    Abstract: Methods and apparatuses for inspecting packets are provided. A primary security system may be configured for processing packets. The primary security system may be operable to maintain flow information for a group of devices to facilitate processing of the packets. A secondary security system may be designated for processing packets upon a failover event. Flow records may be shared from the primary security system with the secondary security system.
    Type: Grant
    Filed: April 23, 2010
    Date of Patent: December 4, 2012
    Assignee: Juniper Networks, Inc.
    Inventors: Nir Zuk, Yu Ming Mao, Kowsik Guruswamy