Patents by Inventor Zahid Ali Khan Durrani

Zahid Ali Khan Durrani 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).

  • Memory device
    Patent number: 6194303
    Abstract: A memory device consists of an array of resonant tunnel diodes in the form of pillars which are formed by selective etching. Each pillar includes first and second barriers (B1, B2) disposed between terminal regions (T1, T2) and a conductive region (CR1) between the barriers. The diameter of the pillars is typically of the order of 20-50 nm and is sufficiently small that the device exhibits first and second relatively high and low stable resistive states in the absence of an applied voltage between the terminal regions. The device can be used as a non-volatile memory at room temperature.
    Type: Grant
    Filed: May 20, 1998
    Date of Patent: February 27, 2001
    Assignee: Hitachi, Ltd.
    Inventors: Bruce Alphenaar, Zahid Ali Khan Durrani
  • Non-volatile memory device
    Patent number: 5811832
    Abstract: A memory device consists of an array of resonant tunnel diodes in the form of pillars which are formed by selective etching. Each pillar includes first and second barriers (B1, B2) disposed between terminal regions (T1, T2) and a conductive region (CR1) between the barriers. The diameter of the pillars is typically of the order of 20-50 nm and is sufficiently small that the device exhibits first and second relatively high and low stable resistive states in the absence of an applied voltage between the terminal regions. The device can be used as a non-volatile memory at room temperature.
    Type: Grant
    Filed: October 18, 1995
    Date of Patent: September 22, 1998
    Assignee: Hitachi, Ltd.
    Inventors: Bruce Alphenaar, Zahid Ali Khan Durrani