Patents by Inventor Placid M. Ferreira

Placid M. Ferreira 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: 10029451
    Abstract: A transfer printing process that exploits the mismatch in mechanical or thermo-mechanical response at the interface of a printable micro- or nano-device and a transfer stamp to drive the release of the device from the stamp and its non-contact transfer to a receiving substrate are provided. The resulting facile, pick-and-place process is demonstrated with the assembling of 3-D microdevices and the printing of GAN light-emitting diodes onto silicon and glass substrates. High speed photography is used to provide experimental evidence of thermo-mechanically driven release.
    Type: Grant
    Filed: December 9, 2016
    Date of Patent: July 24, 2018
    Assignee: The Board of Trustees of the University of Illinois
    Inventors: John A. Rogers, Placid M. Ferreira, Reza Saeidpourazar
  • Publication number: 20170210117
    Abstract: A transfer printing process that exploits the mismatch in mechanical or thermo-mechanical response at the interface of a printable micro- or nano-device and a transfer stamp to drive the release of the device from the stamp and its non-contact transfer to a receiving substrate are provided. The resulting facile, pick-and-place process is demonstrated with the assembling of 3-D microdevices and the printing of GAN light-emitting diodes onto silicon and glass substrates. High speed photography is used to provide experimental evidence of thermo-mechanically driven release.
    Type: Application
    Filed: December 9, 2016
    Publication date: July 27, 2017
    Inventors: John A. ROGERS, Placid M. FERREIRA, Reza SAEIDPOURAZAR
  • Patent number: 9555644
    Abstract: A transfer printing process that exploits the mismatch in mechanical or thermo-mechanical response at the interface of a printable micro- or nano-device and a transfer stamp to drive the release of the device from the stamp and its non-contact transfer to a receiving substrate are provided. The resulting facile, pick-and-place process is demonstrated with the assembling of 3-D microdevices and the printing of GAN light-emitting diodes onto silicon and glass substrates. High speed photography is used to provide experimental evidence of thermo-mechanically driven release.
    Type: Grant
    Filed: July 13, 2012
    Date of Patent: January 31, 2017
    Assignee: THE BOARD OF TRUSTEES OF THE UNIVERSITY OF ILLINOIS
    Inventors: John A. Rogers, Placid M. Ferreira, Reza Saeidpourazar
  • Patent number: 9487002
    Abstract: Provided are high-resolution electrohydrodynamic inkjet (e-jet) printing systems and related methods for printing functional materials on a substrate surface. In an embodiment, a nozzle with an ejection orifice that dispenses a printing fluid faces a surface that is to be printed. The nozzle is electrically connected to a voltage source that applies an electric charge to the fluid in the nozzle to controllably deposit the printing fluid on the surface. In an aspect, a nozzle that dispenses printing fluid has a small ejection orifice, such as an orifice with an area less than 700 ?m2 and is capable of printing nanofeatures or microfeatures. In an embodiment the nozzle is an integrated-electrode nozzle system that is directly connected to an electrode and a counter-electrode. The systems and methods provide printing resolutions that can encompass the sub-micron range.
    Type: Grant
    Filed: April 14, 2015
    Date of Patent: November 8, 2016
    Assignee: The Board of Trustees of the University of Illinois
    Inventors: John A Rogers, Jang-Ung Park, Placid M. Ferreira, Deepkishore Mukhopadhyay
  • Patent number: 9224532
    Abstract: A rolled-up inductor structure for a radiofrequency integrated circuit (RFIC) comprises a multilayer sheet in a rolled configuration comprising multiple turns about a longitudinal axis. The multilayer sheet comprises a conductive pattern layer on a strain-relieved layer, and the conductive pattern layer comprises at least one conductive strip having a length extending in a rolling direction. The at least one conductive strip thereby wraps around the longitudinal axis in the rolled configuration. The conductive pattern layer may also comprise two conductive feed lines connected to the conductive strip for passage of electrical current therethrough. The conductive strip serves as an inductor cell of the rolled-up inductor structure.
    Type: Grant
    Filed: October 10, 2013
    Date of Patent: December 29, 2015
    Assignee: The Board of Trustees of the University of Illinois
    Inventors: Xiuling Li, Wen Huang, Placid M. Ferreira, Xin Yu
  • Publication number: 20150290938
    Abstract: Provided are high-resolution electrohydrodynamic inkjet (e-jet) printing systems and related methods for printing functional materials on a substrate surface. In an embodiment, a nozzle with an ejection orifice that dispenses a printing fluid faces a surface that is to be printed. The nozzle is electrically connected to a voltage source that applies an electric charge to the fluid in the nozzle to controllably deposit the printing fluid on the surface. In an aspect, a nozzle that dispenses printing fluid has a small ejection orifice, such as an orifice with an area less than 700 ?m2 and is capable of printing nanofeatures or microfeatures. In an embodiment the nozzle is an integrated-electrode nozzle system that is directly connected to an electrode and a counter-electrode. The systems and methods provide printing resolutions that can encompass the sub-micron range.
    Type: Application
    Filed: April 14, 2015
    Publication date: October 15, 2015
    Inventors: John A. ROGERS, Jang-Ung PARK, Placid M. FERREIRA, Deepkishore MUKHOPADHYAY
  • Patent number: 9061494
    Abstract: Provided are high-resolution electrohydrodynamic inkjet (e-jet) printing systems and related methods for printing functional materials on a substrate surface. In an embodiment, a nozzle with an ejection orifice that dispenses a printing fluid faces a surface that is to be printed. The nozzle is electrically connected to a voltage source that applies an electric charge to the fluid in the nozzle to controllably deposit the printing fluid on the surface. In an aspect, a nozzle that dispenses printing fluid has a small ejection orifice, such as an orifice with an area less than 700 ?m2 and is capable of printing nanofeatures or microfeatures. In an embodiment the nozzle is an integrated-electrode nozzle system that is directly connected to an electrode and a counter-electrode. The systems and methods provide printing resolutions that can encompass the sub-micron range.
    Type: Grant
    Filed: August 30, 2007
    Date of Patent: June 23, 2015
    Assignee: The Board of Trustees of the University of Illinois
    Inventors: John A. Rogers, Jang-Ung Park, Placid M. Ferreira, Deepkishore Mukhopadhyay
  • Patent number: 8980656
    Abstract: A new method for forming an array of high aspect ratio semiconductor nanostructures entails positioning a surface of a stamp comprising a solid electrolyte in opposition to a conductive film disposed on a semiconductor substrate. The surface of the stamp includes a pattern of relief features in contact with the conductive film so as to define a film-stamp interface. A flux of metal ions is generated across the film-stamp interface, and a pattern of recessed features complementary to the pattern of relief features is created in the conductive film. The recessed features extend through an entire thickness of the conductive film to expose the underlying semiconductor substrate and define a conductive pattern on the substrate. The stamp is removed, and material immediately below the conductive pattern is selectively removed from the substrate. Features are formed in the semiconductor substrate having a length-to-width aspect ratio of at least about 5:1.
    Type: Grant
    Filed: October 14, 2010
    Date of Patent: March 17, 2015
    Assignee: The Board of Trustees of the University of Illinois
    Inventors: Xiuling Li, Nicholas X. Fang, Placid M. Ferreira, Winston Chern, Ik Su Chun, Keng Hao Hsu
  • Publication number: 20140103486
    Abstract: A rolled-up inductor structure for a radiofrequency integrated circuit (RFIC) comprises a multilayer sheet in a rolled configuration comprising multiple turns about a longitudinal axis. The multilayer sheet comprises a conductive pattern layer on a strain-relieved layer, and the conductive pattern layer comprises at least one conductive strip having a length extending in a rolling direction. The at least one conductive strip thereby wraps around the longitudinal axis in the rolled configuration. The conductive pattern layer may also comprise two conductive feed lines connected to the conductive strip for passage of electrical current therethrough. The conductive strip serves as an inductor cell of the rolled-up inductor structure.
    Type: Application
    Filed: October 10, 2013
    Publication date: April 17, 2014
    Inventors: Xiuling Li, Wen Huang, Placid M. Ferreira
  • Publication number: 20130052762
    Abstract: A new method for forming an array of high aspect ratio semiconductor nanostructures entails positioning a surface of a stamp comprising a solid electrolyte in opposition to a conductive film disposed on a semiconductor substrate. The surface of the stamp includes a pattern of relief features in contact with the conductive film so as to define a film-stamp interface. A flux of metal ions is generated across the film-stamp interface, and a pattern of recessed features complementary to the pattern of relief features is created in the conductive film. The recessed features extend through an entire thickness of the conductive film to expose the underlying semiconductor substrate and define a conductive pattern on the substrate. The stamp is removed, and material immediately below the conductive pattern is selectively removed from the substrate. Features are formed in the semiconductor substrate having a length-to-width aspect ratio of at least about 5:1.
    Type: Application
    Filed: October 14, 2010
    Publication date: February 28, 2013
    Inventors: Xiuling Li, Nicholas X. Fang, Placid M. Ferreira, Winston Chern, Ik Su Chun, Keng Hao Hsu
  • Publication number: 20130036928
    Abstract: A transfer printing process that exploits the mismatch in mechanical or thermo-mechanical response at the interface of a printable micro- or nano-device and a transfer stamp to drive the release of the device from the stamp and its non-contact transfer to a receiving substrate are provided. The resulting facile, pick-and-place process is demonstrated with the assembling of 3-D microdevices and the printing of GAN light-emitting diodes onto silicon and glass substrates. High speed photography is used to provide experimental evidence of thermo-mechanically driven release.
    Type: Application
    Filed: July 13, 2012
    Publication date: February 14, 2013
    Inventors: John A. ROGERS, Placid M. FERREIRA, Reza SAEIDPOURAZAR
  • Patent number: 8310128
    Abstract: MEMS stages comprising a plurality of comb drive actuators provide micro and up to nano-positioning capability. Flexure hinges and folded springs that operably connect the actuator to a movable end stage provide independent motion from each of the actuators that minimizes unwanted off-axis displacement, particularly for three-dimensional movement of a cantilever. Also provided are methods for using and making MEMS stages. In an aspect, a process provides a unitary MEMS stage made from a silicon-on-insulator wafer that avoids any post-fabrication assembly steps. Further provided are various devices that incorporate any of the stages disclosed herein, such as devices requiring accurate positioning systems in applications including scanning probe microscopy, E-jet printing, near-field optic sensing, cell probing and material characterization.
    Type: Grant
    Filed: May 7, 2009
    Date of Patent: November 13, 2012
    Assignee: The Board of Trustees of the University of Illinois
    Inventors: Placid M. Ferreira, Jingyan Dong, Deepkishore Mukhopadhyay
  • Patent number: 8076893
    Abstract: An electrostatic drive includes a first electrode and a second electrode responsive to a drive signal. The drive signal includes an actuation signal constituent and a sensing signal constituent. The sensing signal constituent is at a frequency higher than a natural mechanical resonant frequency of the electrostatic drive. In response to the actuation signal constituent, displacement between the first electrode and the second electrode changes, which is evaluated by detecting a change in an electrical characteristic of the drive as a function of the sensing signal constituent.
    Type: Grant
    Filed: September 4, 2008
    Date of Patent: December 13, 2011
    Assignee: The Board of Trustees of the University of Illinois
    Inventors: Jingyan Dong, Placid M. Ferreira
  • Patent number: 7998330
    Abstract: Disclosed herein are electrochemical fabrication platforms for making structures, arrays of structures and functional devices having selected nanosized and/or microsized physical dimensions, shapes and spatial orientations. Methods, systems and system components use an electrochemical stamping tool such as solid state polymeric electrolytes for generating patterns of relief and/or recessed features exhibiting excellent reproducibility, pattern fidelity and resolution on surfaces of solid state ionic conductors and in metal. Electrochemical stamping tools are capable high throughput patterning of large substrate areas, are compatible with commercially attractive manufacturing pathways to access a range of functional systems and devices including nano- and micro-electromechanical systems, sensors, energy storage devices, metal masks for printing, interconnects, and integrated electronic circuits.
    Type: Grant
    Filed: May 19, 2008
    Date of Patent: August 16, 2011
    Assignee: The Board of Trustees of the University of Illinois
    Inventors: Nicholas X. Fang, Placid M. Ferreira, Keng Hao Hsu, Peter Lee Schultz, Kyle E. Jacobs, Anil Kumar
  • Publication number: 20110187798
    Abstract: Provided are high-resolution electrohydrodynamic inkjet (e-jet) printing systems and related methods for printing functional materials on a substrate surface. In an embodiment, a nozzle with an ejection orifice that dispenses a printing fluid faces a surface that is to be printed. The nozzle is electrically connected to a voltage source that applies an electric charge to the fluid in the nozzle to controllably deposit the printing fluid on the surface. In an aspect, a nozzle that dispenses printing fluid has a small ejection orifice, such as an orifice with an area less than 700 ?m2 and is capable of printing nanofeatures or microfeatures. In an embodiment the nozzle is an integrated-electrode nozzle system that is directly connected to an electrode and a counter-electrode. The systems and methods provide printing resolutions that can encompass the sub-micron range.
    Type: Application
    Filed: August 30, 2007
    Publication date: August 4, 2011
    Inventors: John A. Rogers, Jang-Ung Park, Placid M. Ferreira, Deepkishore Mukhopadhyay
  • Publication number: 20100052597
    Abstract: An electrostatic drive includes a first electrode and a second electrode responsive to a drive signal. The drive signal includes an actuation signal constituent and a sensing signal constituent. The sensing signal constituent is at a frequency higher than a natural mechanical resonant frequency of the electrostatic drive. In response to the actuation signal constituent, displacement between the first electrode and the second electrode changes, which is evaluated by detecting a change in an electrical characteristic of the drive as a function of the sensing signal constituent.
    Type: Application
    Filed: September 4, 2008
    Publication date: March 4, 2010
    Inventors: Jingyan Dong, Placid M. Ferreira
  • Publication number: 20100001616
    Abstract: MEMS stages comprising a plurality of comb drive actuators provide micro and up to nano-positioning capability. Flexure hinges and folded springs that operably connect the actuator to a movable end stage provide independent motion from each of the actuators that minimizes unwanted off-axis displacement, particularly for three-dimensional movement of a cantilever. Also provided are methods for using and making MEMS stages. In an aspect, a process provides a unitary MEMS stage made from a silicon-on-insulator wafer that avoids any post-fabrication assembly steps. Further provided are various devices that incorporate any of the stages disclosed herein, such as devices requiring accurate positioning systems in applications including scanning probe microscopy, E-jet printing, near-field optic sensing, cell probing and material characterization.
    Type: Application
    Filed: May 7, 2009
    Publication date: January 7, 2010
    Inventors: Placid M. FERREIRA, Jingyan DONG, Deepkishore MUKHOPADHYAY
  • Publication number: 20090050487
    Abstract: Disclosed herein are electrochemical fabrication platforms for making structures, arrays of structures and functional devices having selected nanosized and/or microsized physical dimensions, shapes and spatial orientations. Methods, systems and system components use an electrochemical stamping tool such as solid state polymeric electrolytes for generating patterns of relief and/or recessed features exhibiting excellent reproducibility, pattern fidelity and resolution on surfaces of solid state ionic conductors and in metal. Electrochemical stamping tools are capable high throughput patterning of large substrate areas, are compatible with commercially attractive manufacturing pathways to access a range of functional systems and devices including nano- and micro-electromechanical systems, sensors, energy storage devices, metal masks for printing, interconnects, and integrated electronic circuits.
    Type: Application
    Filed: May 19, 2008
    Publication date: February 26, 2009
    Inventors: Nicholas X. FANG, Placid M. FERREIRA, Keng Hao HSU, Peter Lee SCHULTZ, Kyle E. JACOBS, Anil KUMAR
  • Patent number: 7239107
    Abstract: In one embodiment, a flexure stage comprises a base, a stage, a positioning mechanism, and a control device. The base and stage have first and second portions that are spaced apart from each other. The positioning mechanism is coupled between the base and the stage. The positioning mechanism includes an actuator and a flexure structure engaged by the actuator. The flexure structure includes base links coupled to the first base portion, stage links coupled to the first stage portion, and an intermediate link coupled to both the base and stage links. All structures are coupled by flexure hinge connections. The control device generates a control signal to change position of the stage by sending a control signal to the actuator which provides a force to elastically deform the flexure structure and correspondingly move the stage.
    Type: Grant
    Filed: February 24, 2006
    Date of Patent: July 3, 2007
    Assignee: The Board of Trustees of the University of Illinois
    Inventors: Placid M. Ferreira, Qing Yao
  • Patent number: 5655956
    Abstract: The invention relates to an apparatus and process for machining a rotating workpiece by means of rotary ultrasonic grinding. The apparatus performs rotary ultrasonic grinding by rotating and vibrating a surface finishing tool in contact with a rotating workpiece. The rotary ultrasonic grinding process is a hybridized method which comprises a combination of conventional ultrasonic machining and diamond grinding. Important parameters in one embodiment of the process include ultrasonic vibration amplitude and frequency, static pressure or force, tool rotation speed, workpiece rotation speed, grit size, grit concentration, abrasive type, and bond type.
    Type: Grant
    Filed: May 23, 1995
    Date of Patent: August 12, 1997
    Assignee: University of Illinois at Urbana-Champaign
    Inventors: Placid M. Ferreira, Nitin Khanna, Zhijain Pei