Patents by Inventor Jeffrey Frederick Rhoads

Jeffrey Frederick Rhoads 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: 11060998
    Abstract: This present disclosure relates to sensors capable of sensing mass, stiffness, and chemical or biological substances. More specifically, this disclosure provides the design and implementation of a piecewise-linear resonator realized via diode- and integrated circuit-based feedback electronics and a quartz crystal resonator. The proposed system is fabricated and characterized, and the creation and selective placement of the bifurcation points of the overall electromechanical system is demonstrated by tuning the circuit gains. The demonstrated circuit operates around at least 1 MHz.
    Type: Grant
    Filed: December 4, 2018
    Date of Patent: July 13, 2021
    Assignee: Purdue Research Foundation
    Inventors: Jeffrey Frederick Rhoads, George Tsu-Chih Chiu, Nikhil Bajaj
  • Patent number: 11027484
    Abstract: Three-dimensional (3D) printed fluoropolymer-based energetic compositions are made using 3D printing methods. The 3D printed fluoropolymer-based energetic compositions comprise a fluoropolymer and a reactive metal or metal oxide. The total weight percentage of the fluoropolymer and the reactive metal or metal oxide is 70-100% of the 3D printed fluoropolymer-based energetic composition, and the weight percentage of the reactive metal or metal oxide is 5-85 wt % of the total weight of the 3D printed fluoropolymer-based energetic material. The 3D printed fluoropolymer-based energetic material has a thickness of at least 200 ?m.
    Type: Grant
    Filed: March 14, 2018
    Date of Patent: June 8, 2021
    Assignee: Purdue Research Foundation
    Inventors: Jeffrey Frederick Rhoads, George Tsu-Chih Chiu, Ibrahim Emre Gunduz, Trevor John Fleck, Allison Kelly Murray, Steven Forrest Son
  • Patent number: 10948489
    Abstract: A method of detecting a substance, wherein the method includes functionalizing a plurality of sensors, wherein the functionalizing the plurality of sensors comprises depositing a first material using a piezoelectrically actuated pipette system, wherein the first material includes a polymer, a receptor, and a solvent, wherein the solvent comprises dimethylformamide. The method further includes evaporating a solution of the first material wherein a residue after the evaporation comprises a functionalized chemical. Additionally, the method includes introducing a control material to a first set of sensors of the plurality of sensors using the piezoelectrically actuated pipette system. Further, the method includes introducing a test material to a second set of sensors of the plurality of sensors using the piezoelectrically actuated pipette system, wherein the test material comprises an analyte.
    Type: Grant
    Filed: July 19, 2018
    Date of Patent: March 16, 2021
    Assignee: Purdue Research Foundation
    Inventors: Jeffrey Frederick Rhoads, Eric A. Nauman, Mackenzie Tweardy, Michael Wadas, Allison Kelly Murray, George Tsu-Chih Chiu, Nikhil Bajaj
  • Publication number: 20210046701
    Abstract: This disclosure generally relates to methods and apparatus for 3D printing of highly viscous materials, especially to high amplitude ultrasonic vibration facilitated lower temperature 3D printing of highly viscous materials with a viscosity of at least 1000 Pa·s.
    Type: Application
    Filed: November 3, 2020
    Publication date: February 18, 2021
    Applicant: Purdue Research Foundation
    Inventors: Jeffrey Frederick Rhoads, Ibrahim Emre Gunduz, Steven Forrest Son, George Tsu-Chih Chiu
  • Publication number: 20210041387
    Abstract: The present disclosure relates to a novel composite film configured for CO2 sensing, and the method of making and using the novel composite film. The novel composite film comprises a carbon nanotube film and a CO2 absorbing layer deposited on the carbon nanotube film, wherein the CO2 absorbing layer comprises a mixture of a branched polyethylenimine, a polyethylene glycol, and poly[1-(4-vinylbenzyl)-3-methylimidazolium tetrafluoroborate] of formula I: wherein n ranges from 10-300.
    Type: Application
    Filed: August 6, 2020
    Publication date: February 11, 2021
    Applicant: Purdue Research Foundation
    Inventors: Jeffrey Frederick Rhoads, George Tsu-Chih Chiu, Bryan W Boudouris, Nikhil Bajaj, Allison Kelly Murray, Zachary A Siefker, Xikang Zhao
  • Publication number: 20200398479
    Abstract: The present disclosure relates to three-dimensional (3D) printed fluoropolymer-based energetic compositions and 3D printing methods for making the 3D printed fluoropolymer-based energetic compositions.
    Type: Application
    Filed: September 2, 2020
    Publication date: December 24, 2020
    Applicant: Purdue Research Foundation
    Inventors: Jeffrey Frederick Rhoads, George Tsu-Chih Chiu, Ibrahim E. Gunduz, Trevor J. Fleck, Allison K. Murray, Steven F. Son
  • Patent number: 10870234
    Abstract: This disclosure generally relates to methods and apparatus for 3D printing of highly viscous materials, especially to high amplitude ultrasonic vibration facilitated lower temperature 3D printing of highly viscous materials with a viscosity of at least 1000 Pa·s.
    Type: Grant
    Filed: November 7, 2017
    Date of Patent: December 22, 2020
    Assignee: Purdue Research Foundation
    Inventors: Jeffrey Frederick Rhoads, Ibrahim Emre Gunduz, Steven Forrest Son, George Tsu-Chih Chiu
  • Publication number: 20200333005
    Abstract: The present disclosure relates to novel non-metallic ignition devices, and the method of making and using the novel non-metallic ignition devices.
    Type: Application
    Filed: July 12, 2019
    Publication date: October 22, 2020
    Applicant: Purdue Research Foundation
    Inventors: Jeffrey Frederick Rhoads, Bryan W. Boudouris, Steven Forrest Son, Miranda P McConnell
  • Publication number: 20200064310
    Abstract: This present disclosure relates to sensors capable of sensing mass, stiffness, and chemical or biological substances. More specifically, this disclosure provides the design and implementation of a piecewise-linear resonator realized via diode- and integrated circuit-based feedback electronics and a quartz crystal resonator. The proposed system is fabricated and characterized, and the creation and selective placement of the bifurcation points of the overall electromechanical system is demonstrated by tuning the circuit gains. The demonstrated circuit operates around at least 1 MHz.
    Type: Application
    Filed: December 4, 2018
    Publication date: February 27, 2020
    Applicant: Purdue Research Foundation
    Inventors: Jeffrey Frederick Rhoads, George Tsu-Chih Chiu, Nikhil Bajaj
  • Publication number: 20190283319
    Abstract: This disclosure generally relates to methods and apparatus for 3D printing of highly viscous materials, especially to high amplitude ultrasonic vibration facilitated lower temperature 3D printing of highly viscous materials with a viscosity of at least 1000 Pa·s.
    Type: Application
    Filed: November 7, 2017
    Publication date: September 19, 2019
    Applicant: Purdue Research Foundation
    Inventors: Jeffrey Frederick Rhoads, Ibrahim Emre Gunduz, Steven Forrest Son, George Tsu-Chih Chiu
  • Publication number: 20190030789
    Abstract: The present disclosure relates to three-dimensional (3D) printed fluoropolymer-based energetic compositions and 3D printing methods for making the 3D printed fluoropolymer-based energetic compositions.
    Type: Application
    Filed: March 14, 2018
    Publication date: January 31, 2019
    Applicant: Purdue Research Foundation
    Inventors: Jeffrey Frederick Rhoads, George Tsu-Chih Chiu, Ibrahim E. Gunduz, Trevor J. Fleck, Allison K. Murray, Steven F. Son
  • Publication number: 20190025296
    Abstract: A method of detecting a substance, wherein the method includes functionalizing a plurality of sensors, wherein the functionalizing the plurality of sensors comprises depositing a first material using a piezoelectrically actuated pipette system, wherein the first material includes a polymer, a receptor, and a solvent, wherein the solvent comprises dimethylformamide. The method further includes evaporating a solution of the first material wherein a residue after the evaporation comprises a functionalized chemical. Additionally, the method includes introducing a control material to a first set of sensors of the plurality of sensors using the piezoelectrically actuated pipette system. Further, the method includes introducing a test material to a second set of sensors of the plurality of sensors using the piezoelectrically actuated pipette system, wherein the test material comprises an analyte.
    Type: Application
    Filed: July 19, 2018
    Publication date: January 24, 2019
    Applicant: Purdue Research Foundation
    Inventors: Jeffrey Frederick Rhoads, Eric A. Nauman, Mackenzie Tweardy, Michael Wadas, Allison Kelly Murray, George Tsu-Chih Chiu, Nikhil Bajaj
  • Patent number: 10072969
    Abstract: A device and method for sensing including a sensor having a functional surface layer located to interact with a material to be sensed, the sensor having an output that produces a signal responsive one or more of inertia, stiffness, acceleration, pressure, radiation, chemical compounds, and biological compounds; and further including electronics including: an input coupled to the sensor to receive a first signal therefrom; and a non-linearity provider that applies one or more non-linear operations to the input signal to generate a non-linear second signal.
    Type: Grant
    Filed: February 7, 2018
    Date of Patent: September 11, 2018
    Assignee: Purdue Research Foundation
    Inventors: Jeffrey Frederick Rhoads, George Tsu-Chih Chiu, Nikhil Bajaj, Andrew Burke Sabater
  • Publication number: 20180180466
    Abstract: A device and method for sensing including a sensor having a functional surface layer located to interact with a material to be sensed, the sensor having an output that produces a signal responsive one or more of inertia, stiffness, acceleration, pressure, radiation, chemical compounds, and biological compounds; and further including electronics including: an input coupled to the sensor to receive a first signal therefrom; and a non-linearity provider that applies one or more non-linear operations to the input signal to generate a non-linear second signal.
    Type: Application
    Filed: February 7, 2018
    Publication date: June 28, 2018
    Applicant: Purdue Research Foundation
    Inventors: Jeffrey Frederick Rhoads, George Tsu-Chih Chiu, Nikhil Bajaj, Andrew Burke Sabater
  • Patent number: 9927287
    Abstract: A device and method for sensing including a sensor having a functional surface layer located to interact with a material to be sensed, the sensor having an output that produces a signal responsive one or more of inertia, stiffness, acceleration, pressure, radiation, chemical compounds, and biological compounds; and further including electronics including: an input coupled to the sensor to receive a first signal therefrom; and a non-linearity provider that applies one or more non-linear operations to the input signal to generate a non-linear second signal.
    Type: Grant
    Filed: December 17, 2015
    Date of Patent: March 27, 2018
    Assignee: Purdue Research Foundation
    Inventors: Jeffrey Frederick Rhoads, George Tsu-Chih Chiu, Nikhil Bajaj, Andrew Burke Sabater
  • Publication number: 20160290855
    Abstract: A device and method for sensing including a sensor having a functional surface layer located to interact with a material to be sensed, the sensor having an output that produces a signal responsive one or more of inertia, stiffness, acceleration, pressure, radiation, chemical compounds, and biological compounds; and further including electronics including: an input coupled to the sensor to receive a first signal therefrom; and a non-linearity provider that applies one or more non-linear operations to the input signal to generate a non-linear second signal.
    Type: Application
    Filed: December 17, 2015
    Publication date: October 6, 2016
    Inventors: Jeffrey Frederick Rhoads, George Tsu-Chih Chiu, Nikhil Bajaj, Andrew Burke Sabater
  • Publication number: 20140203796
    Abstract: A silicon device, e.g., a nanoelectromechanical resonator, has a silicon substrate; an oxide layer having a trench therein; a silicon device layer over the oxide layer; and a nanowire disposed at least partly over the trench. Substantially no oxide or polysilicon is over the nanowire in the trench. A polyimide layer over the silicon device layer includes an opening over the trench. A silicon device can include silicon-on-insulator layers and at least one complementary metal-oxide semiconductor transistor in addition to a nanowire substantially suspended over a trench. A system for measurement of a nanoresonator includes an AC source in series with the nanoresonator to provide an electrical signal thereto at a selected first frequency. Electrode(s) adjacent to and spaced apart from the nanoresonator are driven by voltage source. A detector detects a current through the nanoresonator.
    Type: Application
    Filed: August 16, 2013
    Publication date: July 24, 2014
    Applicant: Purdue Research Foundation
    Inventors: Saeed Mohammadi, Hossein Pajouhi, Jeffrey Frederick Rhoads, Lin Yu
  • Publication number: 20130047710
    Abstract: Nonlinear sensors, which actively exploit dynamic transitions across sub-critical or saddlenode bifurcations in the device's frequency response, can exhibit improved performance metrics and operate effectively at smaller scales. This sensing approach directly exploits chemomechanically induced amplitude shifts for detection. Accordingly, it has the potential to eliminate the need for numerous power-consuming signal processing components in final sensor implementations. Various embodiments pertain to low-cost, linear and nonlinear bifurcation-based mass sensors founded upon selectively functionalized, piezoelectrically actuated microcantilevers. Yet other embodiments pertain to an amplitude-based sensing approach based upon dynamic transitions across saddle-node bifurcations that exist in a sensor's nonlinear frequency response.
    Type: Application
    Filed: August 27, 2012
    Publication date: February 28, 2013
    Applicant: Purdue Research Foundation
    Inventors: Jeffrey Frederick Rhoads, Vjay Kumar