Patents by Inventor Woo Joon Choi

Woo Joon Choi 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).

  • Magnetic resistance memory apparatus having multi levels and method of driving the same
    Patent number: 8848434
    Abstract: A magnetic resistance memory apparatus capable of implementing various levels and a method of driving the same are provided. The magnetic resistance memory apparatus includes a first magnetic device that includes a fixed layer having a fixed magnetization direction, a tunnel layer disposed on the fixed layer, and a first free layer disposed on the tunnel layer having a variable magnetization direction, and a second magnetic device disposed on the first magnetic device including a plurality of free layers insulated with a spacer layer interposed.
    Type: Grant
    Filed: September 24, 2013
    Date of Patent: September 30, 2014
    Assignee: SK Hynix Inc.
    Inventor: Woo Joon Choi