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).
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Publication number: 20230273200Abstract: An electrochemical biosensor for detection of a calprotectin antigen in a sample solution. The electrochemical biosensor includes a reference electrode, a counter electrode, and a working electrode. The working electrode includes a surface coated with an anti-calprotectin antibody that binds to the calprotectin antigen in the sample solution. The electrochemical biosensor detects the concentration of the calprotectin antigen in the sample solution based on a resistance change at the surface of the working electrode.Type: ApplicationFiled: August 11, 2021Publication date: August 31, 2023Inventors: Muhammad Ashraful ALAM, Marco FRATUS, Rahim RAHIMI, Vidhya SELVAMANI, Mohit Singh VERMA, Jiangshan WANG
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Patent number: 11515057Abstract: Hybrid transparent conducting materials are disclosed which 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 the conductive nanostructures preferably are silver nanowires.Type: GrantFiled: October 5, 2020Date of Patent: November 29, 2022Assignee: Purdue Research FoundationInventors: Muhammad Ashraful Alam, Ruiyi Chen, Suprem R. Das, David B. Janes, Changwook Jeong, Mark Lundstrom
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Publication number: 20220219473Abstract: Methods for fabricating printed devices and monitoring one or more performance characteristics of the printed devices during their fabrication in a high-speed process. Such a method includes developing a physics-based model of at least a first component of the printed devices, fabricating the printed devices with the high-speed process using fabrication steps that comprise depositing the first components, acquiring a physical characteristic of a plurality of the first components of a plurality of the printed devices following the depositing of the first components, predicting a performance characteristic of the printed devices based on the physics-based model of the first component and the physical characteristic acquired of the plurality of the first components; and then modifying at least one of the fabrication steps performed during the fabricating of a subsequently-fabricated group of the printed devices to adjust the performance characteristic of the subsequently-fabricated group of the printed devices.Type: ApplicationFiled: January 11, 2022Publication date: July 14, 2022Inventors: Jan P. Allebach, Muhammad Ashraful Alam, Rahim Rahimi, Babak Ziaie, Ali Shakouri, Mukerrem Cakmak, Nicholas Glassmaker, Xihui Wang, Qinyu Yang
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Publication number: 20210139942Abstract: A method and apparatus for electrically monitoring a time-varying liquid droplet whose conductivity is continuously modulated by osmoregulation response of cells. According to the method, the droplet impedance or conductance is monitored over time as the droplet shrinks due to evaporation. The monitoring data is then compared to calibration data which is obtained by monitoring a reference droplet. The result of the comparison is then used to determine the concentration of viable (live) biological material contained in the droplet.Type: ApplicationFiled: April 30, 2020Publication date: May 13, 2021Applicant: Purdue Research FoundationInventors: SeyedehAida Ebrahimi, Muhammad Ashraful Alam
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Publication number: 20210118588Abstract: Hybrid transparent conducting materials are disclosed which 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 the conductive nanostructures preferably are silver nanowires.Type: ApplicationFiled: October 5, 2020Publication date: April 22, 2021Inventors: Muhammad Ashraful ALAM, Ruiyi CHEN, Suprem R. DAS, David B. JANES, Changwook JEONG, Mark LUNDSTROM
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Patent number: 10839974Abstract: 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: GrantFiled: October 1, 2019Date of Patent: November 17, 2020Assignee: PURDUE RESEARCH FOUNDATIONInventors: Muhammad Ashraful Alam, Ruiyi Chen, Suprem R. Das, David B. Janes, Changwook Jeong, Mark Lundstrom
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Publication number: 20200248230Abstract: A process and device for electrostatically controlling an ionic environment in a droplet, such as in a droplet-based platform including polymerase-chain reaction (PCR) applications. The process includes providing a chip that comprises at least a pair of electrodes, placing a salt-containing droplet on the chip, and then applying a bias across the electrodes to accumulate ions near surfaces of the electrodes, thereby depleting a bulk salt concentration in regions of the droplet away from the electrodes.Type: ApplicationFiled: September 4, 2019Publication date: August 6, 2020Applicant: PURDUE RESEARCH FOUNDATIONInventors: Muhammad Ashraful Alam, Piyush Dak
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Publication number: 20200105434Abstract: 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: ApplicationFiled: October 1, 2019Publication date: April 2, 2020Inventors: Muhammad Ashraful ALAM, Ruiyi CHEN, Suprem R. DAS, David B. JANES, Changwook JEONG, Mark LUNDSTROM
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Patent number: 10468151Abstract: 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: GrantFiled: October 24, 2016Date of Patent: November 5, 2019Assignee: PURDUE RESEARCH FOUNDATIONInventors: Muhammad Ashraful Alam, Ruiyi Chen, Suprem R. Das, David B. Janes, Changwook Jeong, Mark Lundstrom
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Patent number: 10312342Abstract: An electrical circuit comprising at least two negative capacitance insulators connected in series, one of the two negative capacitance insulators is biased to generate a negative capacitance. One of the negative capacitance insulators may include an air-gap which is part of a nanoelectromechnical system (NEMS) device and the second negative capacitance insulator includes a ferroelectric material. Both of the negative capacitance insulators may be located between the channel and gate of a field effect transistor. The NEMS device may include a movable electrode, a dielectric and a fixed electrode and arranged so that the movable electrode is attached to at least two points and spaced apart from the dielectric and fixed electrode, and the ferroelectric capacitor is electrically connected to either of the electrodes.Type: GrantFiled: September 5, 2017Date of Patent: June 4, 2019Assignee: Purdue Research FoundationInventors: Muhammad Ashraful Alam, Muhammad Masuduzzaman, Ankit Jain
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Publication number: 20180012972Abstract: An electrical circuit comprising at least two negative capacitance insulators connected in series, one of the two negative capacitance insulators is biased to generate a negative capacitance. One of the negative capacitance insulators may include an air-gap which is part of a nanoelectromechnical system (NEMS) device and the second negative capacitance insulator includes a ferroelectric material. Both of the negative capacitance insulators may be located between the channel and gate of a field effect transistor. The NEMS device may include a movable electrode, a dielectric and a fixed electrode and arranged so that the movable electrode is attached to at least two points and spaced apart from the dielectric and fixed electrode, and the ferroelectric capacitor is electrically connected to either of the electrodes.Type: ApplicationFiled: September 5, 2017Publication date: January 11, 2018Applicant: Purdue Research FoundationInventors: Muhammad Ashraful Alam, Muhammad Masuduzzaman, Ankit Jain
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Patent number: 9755041Abstract: An electrical circuit comprising at least two negative capacitance insulators connected in series, one of the two negative capacitance insulators is biased to generate a negative capacitance. One of the negative capacitance insulators may include an air-gap which is part of a nanoelectromechnical system (NEMS) device and the second negative capacitance insulator includes a ferroelectric material. Both of the negative capacitance insulators may be located between the channel and gate of a field effect transistor. The NEMS device may include a movable electrode, a dielectric and a fixed electrode and arranged so that the movable electrode is attached to at least two points and spaced apart from the dielectric and fixed electrode, and the ferroelectric capacitor is electrically connected to either of the electrodes.Type: GrantFiled: April 30, 2015Date of Patent: September 5, 2017Assignee: PURDUE RESEARCH FOUNDATIONInventors: Muhammad Ashraful Alam, Muhammad Masuduzzaman, Ankit Jain
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Publication number: 20170098486Abstract: 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: ApplicationFiled: October 24, 2016Publication date: April 6, 2017Inventors: Muhammad Ashraful ALAM, Ruiyi CHEN, Suprem R. DAS, David B. JANES, Changwook JEONG
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Publication number: 20170081696Abstract: A method and apparatus for electrically monitoring a time-varying liquid droplet whose conductivity is continuously modulated by osmoregulation response of cells. According to the method, the droplet impedance or conductance is monitored over time as the droplet shrinks due to evaporation. The monitoring data is then compared to calibration data which is obtained by monitoring a reference droplet. The result of the comparison is then used to determine the concentration of viable (live) biological material contained in the droplet.Type: ApplicationFiled: September 19, 2016Publication date: March 23, 2017Applicant: Purdue Research FoundationInventors: SeyedehAida Ebrahimi, Muhammad Ashraful Alam
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Patent number: 9536692Abstract: 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: GrantFiled: October 13, 2015Date of Patent: January 3, 2017Assignee: PURDUE RESEARCH FOUNDATIONInventors: Ankit Jain, Muhammad Ashraful Alam, Pradeep Nair
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Publication number: 20160379702Abstract: 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: ApplicationFiled: September 12, 2016Publication date: December 29, 2016Applicant: Purdue Research FoundationInventors: Muhammad Ashraful Alam, Muhammad Masuduzzaman
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Patent number: 9524806Abstract: 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: GrantFiled: February 7, 2012Date of Patent: December 20, 2016Assignee: PURDUE RESEARCH FOUNDATIONInventors: Changwook Jeong, Mark Lundstrom, Muhammad Ashraful Alam
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Publication number: 20160251699Abstract: A process and device for electrostatically controlling an ionic environment in a droplet, such as in a droplet-based platform including polymerase-chain reaction (PCR) applications. The process includes providing a chip that comprises at least a pair of electrodes, placing a salt-containing droplet on the chip, and then applying a bias across the electrodes to accumulate ions near surfaces of the electrodes, thereby depleting a bulk salt concentration in regions of the droplet away from the electrodes.Type: ApplicationFiled: February 26, 2016Publication date: September 1, 2016Applicant: PURDUE RESEARCH FOUNDATIONInventors: Muhammad Ashraful Alam, Piyush Dak
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Publication number: 20160207761Abstract: An electrical circuit comprising at least two negative capacitance insulators connected in series, one of the two negative capacitance insulators is biased to generate a negative capacitance. One of the negative capacitance insulators may include an air-gap which is part of a nanoelectromechnical system (NEMS) device and the second negative capacitance insulator includes a ferroelectric material. Both of the negative capacitance insulators may be located between the channel and gate of a field effect transistor. The NEMS device may include a movable electrode, a dielectric and a fixed electrode and arranged so that the movable electrode is attached to at least two points and spaced apart from the dielectric and fixed electrode, and the ferroelectric capacitor is electrically connected to either of the electrodes.Type: ApplicationFiled: April 30, 2015Publication date: July 21, 2016Applicant: Purdue Research FoundationInventors: Muhammad Ashraful Alam, Muhammad Masuduzzaman, Ankit Jain
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Publication number: 20160141133Abstract: 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: ApplicationFiled: October 13, 2015Publication date: May 19, 2016Applicant: PURDUE RESEARCH FOUNDATIONInventors: Ankit Jain, Muhammad Ashraful Alam, Pradeep Nair