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).
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Patent number: 11872772Abstract: An apparatus for fabricating a hybrid tube includes a rotatable mandrel and a first housing configured to translate alongside the rotatable mandrel while dispensing a first strip to be helically wound about the mandrel. The first housing includes an angle adjustment mechanism to control a dispensation angle of the first strip. The apparatus also includes least one energy or adhesive source for bonding overlapping strip portions on the rotatable mandrel and forming the hybrid tube. The at least one energy or adhesive source is configured for translation alongside the rotatable mandrel.Type: GrantFiled: July 19, 2021Date of Patent: January 16, 2024Assignee: THE BOARD OF TRUSTEES OF THE UNIVERSITY OF ILLINOISInventors: Sanjiv Sinha, Placid M. Ferreira, Nenad Miljkovic, Manjunath C. Rajagopal, Gowtham Kuntumalla, Akhilesh Sanjay Somani
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Publication number: 20220315805Abstract: A dry adhesive for attachment to a flexible adherend comprises a shape memory polymer having a glass transition temperature (Tg) above 25° C. and a compliant backing layer attached to the shape memory polymer.Type: ApplicationFiled: March 31, 2022Publication date: October 6, 2022Inventors: Seok Kim, Placid M. Ferreira, ChangHee Son
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Publication number: 20220024154Abstract: An apparatus for fabricating a hybrid tube includes a rotatable mandrel and a first housing configured to translate alongside the rotatable mandrel while dispensing a first strip to be helically wound about the mandrel. The first housing includes an angle adjustment mechanism to control a dispensation angle of the first strip. The apparatus also includes least one energy or adhesive source for bonding overlapping strip portions on the rotatable mandrel and forming the hybrid tube. The at least one energy or adhesive source is configured for translation alongside the rotatable mandrel.Type: ApplicationFiled: July 19, 2021Publication date: January 27, 2022Inventors: Sanjiv Sinha, Placid M. Ferreira, Nenad Miljkovic, Manjunath C. Rajagopal, Gowtham Kuntumalla, Akhilesh Sanjay Somani
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Patent number: 10029451Abstract: 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: GrantFiled: December 9, 2016Date of Patent: July 24, 2018Assignee: The Board of Trustees of the University of IllinoisInventors: John A. Rogers, Placid M. Ferreira, Reza Saeidpourazar
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Publication number: 20170210117Abstract: 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: ApplicationFiled: December 9, 2016Publication date: July 27, 2017Inventors: John A. ROGERS, Placid M. FERREIRA, Reza SAEIDPOURAZAR
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Patent number: 9555644Abstract: 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: GrantFiled: July 13, 2012Date of Patent: January 31, 2017Assignee: THE BOARD OF TRUSTEES OF THE UNIVERSITY OF ILLINOISInventors: John A. Rogers, Placid M. Ferreira, Reza Saeidpourazar
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Patent number: 9487002Abstract: 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: GrantFiled: April 14, 2015Date of Patent: November 8, 2016Assignee: The Board of Trustees of the University of IllinoisInventors: John A Rogers, Jang-Ung Park, Placid M. Ferreira, Deepkishore Mukhopadhyay
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Patent number: 9224532Abstract: 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: GrantFiled: October 10, 2013Date of Patent: December 29, 2015Assignee: The Board of Trustees of the University of IllinoisInventors: Xiuling Li, Wen Huang, Placid M. Ferreira, Xin Yu
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Publication number: 20150290938Abstract: 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: ApplicationFiled: April 14, 2015Publication date: October 15, 2015Inventors: John A. ROGERS, Jang-Ung PARK, Placid M. FERREIRA, Deepkishore MUKHOPADHYAY
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Patent number: 9061494Abstract: 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: GrantFiled: August 30, 2007Date of Patent: June 23, 2015Assignee: The Board of Trustees of the University of IllinoisInventors: John A. Rogers, Jang-Ung Park, Placid M. Ferreira, Deepkishore Mukhopadhyay
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Patent number: 8980656Abstract: 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: GrantFiled: October 14, 2010Date of Patent: March 17, 2015Assignee: The Board of Trustees of the University of IllinoisInventors: Xiuling Li, Nicholas X. Fang, Placid M. Ferreira, Winston Chern, Ik Su Chun, Keng Hao Hsu
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Publication number: 20140103486Abstract: 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: ApplicationFiled: October 10, 2013Publication date: April 17, 2014Inventors: Xiuling Li, Wen Huang, Placid M. Ferreira
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Publication number: 20130052762Abstract: 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: ApplicationFiled: October 14, 2010Publication date: February 28, 2013Inventors: Xiuling Li, Nicholas X. Fang, Placid M. Ferreira, Winston Chern, Ik Su Chun, Keng Hao Hsu
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Publication number: 20130036928Abstract: 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: ApplicationFiled: July 13, 2012Publication date: February 14, 2013Inventors: John A. ROGERS, Placid M. FERREIRA, Reza SAEIDPOURAZAR
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Patent number: 8310128Abstract: 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: GrantFiled: May 7, 2009Date of Patent: November 13, 2012Assignee: The Board of Trustees of the University of IllinoisInventors: Placid M. Ferreira, Jingyan Dong, Deepkishore Mukhopadhyay
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Patent number: 8076893Abstract: 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: GrantFiled: September 4, 2008Date of Patent: December 13, 2011Assignee: The Board of Trustees of the University of IllinoisInventors: Jingyan Dong, Placid M. Ferreira
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Patent number: 7998330Abstract: 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: GrantFiled: May 19, 2008Date of Patent: August 16, 2011Assignee: The Board of Trustees of the University of IllinoisInventors: Nicholas X. Fang, Placid M. Ferreira, Keng Hao Hsu, Peter Lee Schultz, Kyle E. Jacobs, Anil Kumar
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Publication number: 20110187798Abstract: 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: ApplicationFiled: August 30, 2007Publication date: August 4, 2011Inventors: John A. Rogers, Jang-Ung Park, Placid M. Ferreira, Deepkishore Mukhopadhyay
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Publication number: 20100052597Abstract: 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: ApplicationFiled: September 4, 2008Publication date: March 4, 2010Inventors: Jingyan Dong, Placid M. Ferreira
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Publication number: 20100001616Abstract: 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: ApplicationFiled: May 7, 2009Publication date: January 7, 2010Inventors: Placid M. FERREIRA, Jingyan DONG, Deepkishore MUKHOPADHYAY