Patents by Inventor Muhammad Ashraful Alam

Muhammad Ashraful Alam 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: 9160333
    Abstract: A microelectromechanical system (MEMS)-based electrical switch. The electrical switch includes a moveable electrode, a dielectric layer positioned adjacent the moveable electrode on a first side of the dielectric layer and spaced apart from the moveable electrode when the moveable electrode is in an inactivated position and in contact with the moveable electrode when the moveable electrode is in an activated position, and a substrate attached to the dielectric layer on a second side opposite to the first side, the moveable electrode is configured to brake prior to coming in contact with the dielectric layer when the moveable electrode is switched between the inactivated state and the activated state.
    Type: Grant
    Filed: May 7, 2012
    Date of Patent: October 13, 2015
    Assignee: PURDUE RESEARCH FOUNDATION
    Inventors: Ankit Jain, Muhammad Ashraful Alam, Pradeep R Nair
  • Patent number: 9052281
    Abstract: Transistor-based particle detection systems and methods may be configured to detect charged and non-charged particles. Such systems may include a supporting structure contacting a gate of a transistor and separating the gate from a dielectric of the transistor, and the transistor may have a near pull-in bias and a sub-threshold region bias to facilitate particle detection. The transistor may be configured to change current flow through the transistor in response to a change in stiffness of the gate caused by securing of a particle to the gate, and the transistor-based particle detection system may configured to detect the non-charged particle at least from the change in current flow.
    Type: Grant
    Filed: January 23, 2013
    Date of Patent: June 9, 2015
    Assignee: Purdue Research Foundation
    Inventors: Ankit Jain, Pradeep R. Nair, Muhammad Ashraful Alam
  • Publication number: 20150124514
    Abstract: A method and apparatus for increasing the lifetime of ferroelectric devices is presented. The method includes applying a waveform to the input pulse to increase the rise or fall time of the pulse. The waveform may comprise a ramp, a step, or combinations of both. The waveform may be symmetrical with respect to the rising and falling edges of the pulses. A temperature control device may also be operatively connected to increase the temperature of the device to increase lifetime. In other embodiments, a resistance may be operatively connected in series with the ferroelectric device to increase lifetime.
    Type: Application
    Filed: November 5, 2014
    Publication date: May 7, 2015
    Applicant: PURDUE RESEARCH FOUNDATION
    Inventors: Muhammad Ashraful Alam, Muhammad Masuduzzaman
  • Patent number: 8946846
    Abstract: Conductive layer(s) in a thin film photovoltaic (TFPV) panel are divided by first scribe curves into photovoltaic cells connected in series. At least one of the layers is scribed to isolate a shunt defect in a cell from parts of that cell away from the defect. The isolation scribes can substantially follow or parallel current-flow lines established by the design of the panel. A TFPV panel can be altered by, using a controller, automatically locating a shunt defect and scribing at least one of the conductive layers along two spaced-apart second scribe curves. Each second scribe curve can intersect the two first scribe curves that bound the cell with the defect. The two second scribe curves can be on opposite sides of the defect.
    Type: Grant
    Filed: February 7, 2013
    Date of Patent: February 3, 2015
    Assignee: Purdue Research Foundation
    Inventors: Muhammad Ashraful Alam, Sourabh Dongaonkar
  • Publication number: 20140217535
    Abstract: Conductive layer(s) in a thin film photovoltaic (TFPV) panel are divided by first scribe curves into photovoltaic cells connected in series. At least one of the layers is scribed to isolate a shunt defect in a cell from parts of that cell away from the defect. The isolation scribes can substantially follow or parallel current-flow lines established by the design of the panel. A TFPV panel can be altered by, using a controller, automatically locating a shunt defect and scribing at least one of the conductive layers along two spaced-apart second scribe curves. Each second scribe curve can intersect the two first scribe curves that bound the cell with the defect. The two second scribe curves can be on opposite sides of the defect.
    Type: Application
    Filed: February 7, 2013
    Publication date: August 7, 2014
    Applicant: Purdue Research Foundation
    Inventors: Muhammad Ashraful Alam, Sourabh Dongaonkar
  • Publication number: 20140014171
    Abstract: Hybrid transparent conducting materials are disclosed with combine a polycrystalline film and conductive nanostructures, in which the polycrystalline film is “percolation doped” with the conductive nanostructures. The polycrystalline film preferably is a single atomic layer thickness of polycrystalline graphene, and conductive nanostructures preferably are silver nanowires.
    Type: Application
    Filed: June 17, 2013
    Publication date: January 16, 2014
    Applicant: PURDUE RESEARCH FOUNDATION
    Inventors: Muhammad Ashraful ALAM, Ruiyi CHEN, Suprem R. DAS, David B. JANES, Changwook JEONG
  • Publication number: 20130200421
    Abstract: Illustrative embodiments of hybrid transparent conducting materials and applications thereof are disclosed. In one illustrative embodiment, a hybrid transparent conducting material may include a polycrystalline film and a plurality of conductive nanostructures randomly dispersed in the polycrystalline film. In another illustrative embodiment, a photovoltaic cell may include a transparent electrode comprising polycrystalline graphene that is percolation doped with metallic nanowires, where the metallic nanowires do not form a percolation network for charge carriers across the transparent electrode.
    Type: Application
    Filed: February 7, 2012
    Publication date: August 8, 2013
    Inventors: Changwook Jeong, Mark Lundstrom, Muhammad Ashraful Alam
  • Publication number: 20130187200
    Abstract: Transistor-based particle detection systems and methods may be configured to detect charged and non-charged particles. Such systems may include a supporting structure contacting a gate of a transistor and separating the gate from a dielectric of the transistor, and the transistor may have a near pull-in bias and a sub-threshold region bias to facilitate particle detection. The transistor may be configured to change current flow through the transistor in response to a change in stiffness of the gate caused by securing of a particle to the gate, and the transistor-based particle detection system may configured to detect the non-charged particle at least from the change in current flow.
    Type: Application
    Filed: January 23, 2013
    Publication date: July 25, 2013
    Inventors: Ankit JAIN, Pradeep R. Nair, Muhammad Ashraful ALAM
  • Publication number: 20120279846
    Abstract: A microelectromechanical system (MEMS)-based electrical switch. The electrical switch includes a moveable electrode, a dielectric layer positioned adjacent the moveable electrode on a first side of the dielectric layer and spaced apart from the moveable electrode when the moveable electrode is in an inactivated position and in contact with the moveable electrode when the moveable electrode is in an activated position, and a substrate attached to the dielectric layer on a second side opposite to the first side, the moveable electrode is configured to brake prior to coming in contact with the dielectric layer when the moveable electrode is switched between the inactivated state and the activated state.
    Type: Application
    Filed: May 7, 2012
    Publication date: November 8, 2012
    Applicant: PURDUE RESEARCH FOUNDATION
    Inventors: Ankit Jain, Muhammad Ashraful Alam, Pradeep R. Nair
  • Patent number: 7230812
    Abstract: It is possible to predict with acceptable accuracy the time to failure of a device having a thin gate dielectric in a field effect transistor. Such prediction is based on the realization that for such thin dielectric multiple dielectric breakdown occurs before device failure ensues and that measurement of the device quiescent current flow provides the information necessary for such prediction. The ability to make reliable prediction allows improvement of device design, manufacture, and use.
    Type: Grant
    Filed: August 30, 2004
    Date of Patent: June 12, 2007
    Assignee: Agere Systems Inc
    Inventors: Muhammad Ashraful Alam, Philip W. Mason, Robert Kent Smith
  • Publication number: 20020175325
    Abstract: The invention is a semiconductor optical device and a method of manufacture. The device includes a first waveguide having an edge, and a second waveguide adjacent to at least a portion of the first waveguide including the edge so that light is coupled from the first to the second waveguide. The second waveguide has a modal index which is essentially constant at least at the edge of the first waveguide. The method includes forming at least the second waveguide by Selective Area Growth (SAG) using oxide pads of a particular geometry to achieve the essentially constant modal index. In one embodiment, the device is an expanded beam laser with an expander portion which is less than 300 microns.
    Type: Application
    Filed: April 28, 2000
    Publication date: November 28, 2002
    Inventors: Muhammad Ashraful Alam, Julie Eng, Mark S. Hybertsen, John Evan Johnson, Leonard Jan-Peter Ketelsen, Roosevlet People, Janice People, Dennis Mark Romero