Patents by Inventor Yana Qian

Yana Qian 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).

  • Damascene process using PVD sputter carbon film as CMP stop layer for forming a magnetic recording head
    Patent number: 9018100
    Abstract: Damascene processes using physical vapor deposition (PVD) sputter carbon film as a chemical mechanical planarization (CMP) stop layer for forming a magnetic recording head are provided. In one embodiment, one such process includes providing an insulator, removing a portion of the insulator to form a trench within the insulator, depositing a carbon material on first portions of the insulator using a physical vapor deposition process, disposing at least one ferromagnetic material on second portions of the insulator to form a pole including a portion of the ferromagnetic material within the trench, and performing a chemical mechanical planarization on the at least one ferromagnetic material using at least a portion of the carbon material as a stop for the chemical mechanical planarization.
    Type: Grant
    Filed: November 10, 2010
    Date of Patent: April 28, 2015
    Assignee: Western Digital (Fremont), LLC
    Inventors: Yanfeng Chen, Yunjun Tang, Yana Qian, Ming M. Yang, Yunfei Li, Paul E. Anderson
  • DAMASCENE PROCESS USING PVD SPUTTER CARBON FILM AS CMP STOP LAYER FOR FORMING A MAGNETIC RECORDING HEAD
    Publication number: 20120111826
    Abstract: Damascene processes using physical vapor deposition (PVD) sputter carbon film as a chemical mechanical planarization (CMP) stop layer for forming a magnetic recording head are provided. In one embodiment, one such process includes providing an insulator, removing a portion of the insulator to form a trench within the insulator, depositing a carbon material on first portions of the insulator using a physical vapor deposition process, disposing at least one ferromagnetic material on second portions of the insulator to form a pole including a portion of the ferromagnetic material within the trench, and performing a chemical mechanical planarization on the at least one ferromagnetic material using at least a portion of the carbon material as a stop for the chemical mechanical planarization.
    Type: Application
    Filed: November 10, 2010
    Publication date: May 10, 2012
    Applicant: Western Digital (Fremont), LLC
    Inventors: YANFENG CHEN, Yunjun Tang, Yana Qian, Ming M. Yang, Yunfei Li, Paul E. Anderson
  • Case hardenable nickel-cobalt steel
    Patent number: 8157931
    Abstract: An advanced secondary hardening carburized Ni—Co steel achieves an improved case hardness of about 68-69 Rc together with nominal core hardness of about 50 Rc.
    Type: Grant
    Filed: July 1, 2009
    Date of Patent: April 17, 2012
    Assignee: Northwestern University
    Inventors: Yana Qian, Gregory B. Olson
  • Case hardenable nickel-cobalt steel
    Publication number: 20100200122
    Abstract: An advanced secondary hardening carburized Ni—Co steel achieves an improved case hardness of about 68-69 Rc together with nominal core hardness of about 50 Rc.
    Type: Application
    Filed: July 1, 2009
    Publication date: August 12, 2010
    Inventors: Yana Qian, Gregory B. Olson