Patents by Inventor Wan Ting Looi

Wan Ting Looi 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).

  • ABS design for uniform touch-down and back-off in DFH applications
    Patent number: 8867172
    Abstract: A DFH (Dynamic Flying Height) type slider ABS design has significantly improved DFH efficiency and back-off efficiency as well as uniform touchdown detectability. This is the result of decoupling the local pressure variations at the read/write head that result from skew angle variations across a disk, from local stiffness due to ABS protrusion caused by heater activation. The decoupling, which allows the heater activation stiffness to be carefully tuned, is a result of the effects of airflow channeled by a wide down-track channel onto a narrow down-track channel formed in an extended finger of the central pad of the slider. Airflow impinges on the finger channel in a manner that eliminates variations in air pressure at the central pad due to variations in skew angle.
    Type: Grant
    Filed: July 31, 2012
    Date of Patent: October 21, 2014
    Assignees: SAE Magnetics (HK) Ltd., Headway Technologies, Inc.
    Inventors: Guoqiang Zheng, Wan Ting Looi, Kwun Pan Ng, Ellis Cha
  • ABS Design for Uniform Touch-Down and Back-Off in DFH Applications
    Publication number: 20140036384
    Abstract: A DFH (Dynamic Flying Height) type slider ABS design has significantly improved DFH efficiency and back-off efficiency as well as uniform touchdown detectability. This is the result of decoupling the local pressure variations at the read/write head that result from skew angle variations across a disk, from local stiffness due to ABS protrusion caused by heater activation. The decoupling, which allows the heater activation stiffness to be carefully tuned, is a result of the effects of airflow channeled by a wide down-track channel onto a narrow down-track channel formed in an extended finger of the central pad of the slider. Airflow impinges on the finger channel in a manner that eliminates variations in air pressure at the central pad due to variations in skew angle.
    Type: Application
    Filed: July 31, 2012
    Publication date: February 6, 2014
    Applicants: HEADWAY TECHNOLOGIES, INC., SAE MAGNETICS (H.K.) LTD.
    Inventors: Guoqiang Zheng, Wan Ting Looi, Kwun Pan Ng, Ellis Cha