Patents Assigned to Virginia Tech
  • Publication number: 20130340328
    Abstract: A process for cleaning and dewatering hydrophobic particulate materials is presented. The process is performed in two steps: 1) agglomeration of the hydrophobic particles in a first hydrophobic liquid/aqueous mixture; followed by 2) dispersion of the agglomerates in a second hydrophobic liquid to release the water trapped within the agglomerates along with the entrained hydrophilic particles.
    Type: Application
    Filed: June 11, 2013
    Publication date: December 26, 2013
    Applicant: VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.
    Inventor: Roe-Hoan YOON
  • Patent number: 8598807
    Abstract: A multi-channel circuit having respective channels powered through transformers having primary windings connected in series allows substantially equal constant currents to be provided through all channels by cross-regulation while only a single channel need be monitored and controlled. The variation in current between channels is generally small and largely insensitive to imbalances between voltages on loads due, for example, to different numbers of LEDs in series connected strings in illumination devices and can be further reduced by inverse coupling between inductors in respective channels. Efficiency is improved through reduction in the number of stages of the constant current source since the respective channels provided both DC-to-DC conversion and constant current regulation.
    Type: Grant
    Filed: May 24, 2011
    Date of Patent: December 3, 2013
    Assignee: Virginia Tech Intellectual Properties, Inc.
    Inventors: Shu Ji, Haoran Wu, Fred C. Lee
  • Publication number: 20130318607
    Abstract: Procedures are described for enhancing target system execution integrity determined by power fingerprinting (PFP): by integrating PFP into the detection phase of comprehensive defense-in-depth security; by deploying a network of PFP enabled nodes executing untrusted devices with predefined inputs forcing a specific state sequence and specific software execution; by embedding module identification information into synchronization signaling; by combining signals from different board elements; by using malware signatures to enhance PFP performance; by automatic characterization and signature extraction; by providing secure signature updates; by protecting against side-channel attacks; performing real-time integrity assessment in embedded platform by monitoring their dynamic power consumption and comparing it against signatures from trusted code, including pre-characterizing power consumption of the platform by concentrating on trace sections carrying the most information about the internal execution status; by u
    Type: Application
    Filed: November 3, 2011
    Publication date: November 28, 2013
    Applicant: VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.
    Inventors: Jeffrey H. Reed, Carlos R. Aguayo Gonzalez
  • Publication number: 20130315944
    Abstract: The present invention also provides infectious DNA clones, biologically functional plasmid or viral vector containing the infectious nucleic acid genome molecule of Torque teno sus virus (TTsuV). The present invention also provides methods for diagnosing TTsuV infection via immunological methods, e.g., enzyme-linked immunoabsorbent assay (ELISA) and Western blot using PTTV specific antigens for detecting serum PTTV specific antibodies which indicate infections TTsuV1, TTsuV2, and individual TTsuV1 genotypes.
    Type: Application
    Filed: March 15, 2013
    Publication date: November 28, 2013
    Applicant: VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.
    Inventors: Xiang-Jin MENG, Yaowei HUANG
  • Publication number: 20130305638
    Abstract: Provided are systems and components for modular wall assembly. The components include horizontal tracks, vertical studs, and floor tracks that have engagement means for assembling the components together into a frame structure. Horizontal tracks and floor tracks have portions for mourning a wall module such as a wall panel unit, bookshelf unit, or cabinet. The horizontal tracks, vertical studs, and floor studs may be CNC cut from a CAD file for precision alignment between interlocking components. The modular wall assembly systems provide for ease of construction and flexibility m designing the layout of an interior wall.
    Type: Application
    Filed: May 20, 2013
    Publication date: November 21, 2013
    Applicant: VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.
    Inventor: Joseph Wheeler
  • Patent number: 8575911
    Abstract: Stabilization of a switching voltage regulator employing V2 control against ripple oscillation instability when the equivalent series resistance (ESR) of an output capacitor is small is provided by providing both an external ramp and an internal ramp (only the latter of which requires an approximation of inductor current) in the control feedback path, preferably including both inner and outer feedback loops. Approximation of inductor current using such an arrangement is non-critical and may be estimated based on power input voltage. Drift of a circuit providing such an inductor current estimation is preferably avoided by adjusting control duty cycle or slew rate of the positive-going ramp portion of the estimated inductor current triangular waveform.
    Type: Grant
    Filed: August 12, 2010
    Date of Patent: November 5, 2013
    Assignee: Virginia Tech Intellectual Properties, Inc.
    Inventors: Kuang-Yao Cheng, Feng Yu, Paolo Mattavelli, Fred C. Lee
  • Patent number: 8558019
    Abstract: Thioloated taxane derivatives are linked to colloidal metal particles such as gold nanoparticles for use as antitumor agents. The antitumor agents may be targeted to tumors.
    Type: Grant
    Filed: November 10, 2008
    Date of Patent: October 15, 2013
    Assignees: Virginia Tech Intellectual Properties, Inc., Cytimmune Sciences, Inc.
    Inventors: David G. I. Kingston, Shugeng Cao, Jielu Zhao, Glullo F. Paciotti, Marja S. Hubta
  • Patent number: 8549731
    Abstract: Ceramic inductors are made from stacked sheets of co-fired ceramic. At least one of the ceramic sheets has a slot with a conductor disposed in the slot. The conductor has a thickness equal to a thickness of the ceramic sheet containing the slot. The conductor has a large thickness (compared to prior art co-fired ceramic inductors) and therefore can carry large currents. The present ceramic inductor can be used in power electronics applications due to the ability to carry large currents. The present ceramic inductor preferably has an inductance that decreases with increasing current. A decreasing inductance characteristic tends to increase energy efficiency in a voltage regulator when the inductor is used as an output inductor. Specifically, the variable inductance tends to substantially increase energy efficiency at low current loads without adversely affecting efficiency at high loads.
    Type: Grant
    Filed: October 12, 2009
    Date of Patent: October 8, 2013
    Assignee: Virginia Tech Intellectual Properties, Inc.
    Inventors: Michele H. Lim, J. D. van Wyk
  • Patent number: 8550206
    Abstract: The present invention relates hearing protection devices for the human ear. More particularly, embodiments of the invention provide hearing protection devices capable of tunable acoustic attenuation. The invention relates further to ear plugs comprising a fluid-containing balloon for occlusion of the ear canal, which are capable of being adjusted for example by modifying fluid composition and/or fluid pressure within the balloon to vary attenuation at different frequencies of the audible sound spectrum. Other embodiments provide an earplug with fixed attenuation comprising: a body of compressible/expandable-recovery material shaped and sized to fit in an ear canal; and at least one chamber disposed within the body and comprising a filler material chosen from at least one of water, aphrons, water with solid or gelatinous particles suspended, and oil with particles suspended.
    Type: Grant
    Filed: May 31, 2012
    Date of Patent: October 8, 2013
    Assignee: Virginia Tech Intellectual Properties, Inc.
    Inventors: John Patrick Keady, John G. Casali, Kichol Lee
  • Patent number: 8545581
    Abstract: Methods for fractional catalytic pyrolysis which allow for conversion of biomass into a slate of desired products without the need for post-pyrolysis separation are described. The methods involve use of a fluid catalytic bed which is maintained at a suitable pyrolysis temperature. Biomass is added to the catalytic bed, preferably while entrained in a non-reactive gas such as nitrogen, causing the biomass to become pyrolyzed and forming the desired products in vapor and gas forms, allowing the desired products to be easily separated.
    Type: Grant
    Filed: January 21, 2010
    Date of Patent: October 1, 2013
    Assignee: Virginia Tech Intellectual Properties, Inc.
    Inventor: Foster A. Agblevor
  • Publication number: 20130253415
    Abstract: The present invention relates to the field of medical treatment of diseases and disorders, as well as the field of biomedical engineering. Embodiments of the invention relate to the delivery of Irreversible Electroporation (IRE) through the vasculature of organs to treat tumors embedded deep within the tissue or organ, or to decellularize organs to produce a scaffold from existing animal tissue with the existing vasculature intact. In particular, methods of administering non-thermal irreversible electroporation (IRE) in vivo are provided for the treatment of tumors located in vascularized tissues and organs. Embodiments of the invention further provide scaffolds and tissues from natural sources created using IRE ex vivo to remove cellular debris, maximize recellularization potential, and minimize foreign body immune response. The engineered tissues can be used in methods of treating subjects, such as those in need of tissue replacement or augmentation.
    Type: Application
    Filed: November 23, 2011
    Publication date: September 26, 2013
    Applicant: Virginia Tech Intellectual Properties, Inc.
    Inventors: Michael B. Sano, Rafael V. Davalos, John L. Robertson, Paulo A. Garcia, Robert E. Neal
  • Patent number: 8541210
    Abstract: Pythium, when cultured with crude glycerol as a carbon source, produces useful polyunsaturated fatty acids such as eicosapentaenoic acid (EPA). The crude glycerol is pretreated to remove soaps and methanol. An exemplary Pythium species for use in the production of EPA is Pythium irregulare.
    Type: Grant
    Filed: June 1, 2012
    Date of Patent: September 24, 2013
    Assignee: Virginia Tech Intellectual Properties, Inc.
    Inventors: Zhiyou Wen, Sneba Athalye
  • Publication number: 20130236953
    Abstract: Embodiments of the present invention overcome the well-known recalcitrance of lignocellulosic biomass in an economically viable manner. A process and a system are provided for the efficient fractionation of lignocellulosic biomass into cellulose, hemicellulose, and lignin. The cellulose and hemicellulose thus obtained are highly amorphous and can be readily converted into highly concentrated mixtures of five and six carbon sugars using known methods. Typical yields of sugars exceed 100 grams of sugars per liter of sugar solution. Other products, such as alcohols, can easily be prepared according to methods of the invention. The modest process conditions and low solvent/solid ratios of some embodiments of the invention require relatively low capital and processing costs.
    Type: Application
    Filed: April 22, 2013
    Publication date: September 12, 2013
    Applicant: VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.
    Inventor: Y.H. Percival Zhang
  • Publication number: 20130223804
    Abstract: A random array of holes is created in an optical fiber by gas generated during fiber drawing. The gas forms bubbles which are drawn into long, microscopic holes. The gas is created by a gas generating material such as silicon nitride. Silicon nitride oxidizes to produce nitrogen oxides when heated. The gas generating material can alternatively be silicon carbide or other nitrides or carbides. The random holes can provide cladding for optical confinement when located around a fiber core. The random holes can also be present in the fiber core. The fibers can be made of silica. The present random hole fibers are particularly useful as pressure sensors since they experience a large wavelength dependant increase in optical loss when pressure or force is applied.
    Type: Application
    Filed: May 21, 2012
    Publication date: August 29, 2013
    Applicant: Virginia Tech Intellectual Properties, Inc.
    Inventors: Jeong I. KIM, Daniel KOMINSKY, Gary PICKRELL, Ahmad SAFAAI-JAZI, Roger H. STOLEN, Anbo WANG
  • Patent number: 8521357
    Abstract: An impaired operation detection method is basically performed by sensing a yaw rate of a vehicle over a time period. Then time points are identified in which the yaw rate changes direction. A linear rate of change in the yaw rate is determined between two of the time points that are sequential in time. An actual rate of change is examined between the two time points. A difference between the actual rate of change and the linear rate of change to obtain a difference value. Then, the operator's impairment condition is determined based on the difference value.
    Type: Grant
    Filed: April 26, 2010
    Date of Patent: August 27, 2013
    Assignees: Nissan North America, Inc., Nissan Motor Co., Ltd., Virginia Tech Intellectual Property, Inc.
    Inventors: Shane McLaughlin, Hiroshi Tsuda, Jon Hankey, Tomohiro Yamamura, Nobuyuki Kuge
  • Publication number: 20130212249
    Abstract: The invention dynamically obscures network and transport layer addresses of packets to achieve anonymity, including authentication privacy, as well as protection against tracking and traffic correlation and certain classes of network attacks by combining both intrusion protection with anonymity, avoiding the use of a separate management unit outside the host for distribution of obscured addresses. The invention enables a host to automatically configure obscured addresses and determine the obscured address of the intended recipient without outside involvement, computing addresses based on a set of parameters, and to operate without re-authentication whenever an address changes. The invention enables encryption of the packet payload to prevent traffic correlation. The technology of the invention can be implemented embedded on a host device or as a connected gateway device and requires negligible configuration and is therefore transparent to hosts.
    Type: Application
    Filed: October 7, 2011
    Publication date: August 15, 2013
    Applicant: VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.
    Inventors: Stephen L. Groat, Matthew W. Dunlop, William M. Urbanski, Randolph C. Marchany, Joseph Tront
  • Publication number: 20130193693
    Abstract: Multi-Mechanism Energy Harvesters (MMEHs) combining magnetostrictive and inductive mechanisms with a shape and size similar to an AA battery. Included are MMEHs with (a) an inductive mode: a cylindrical tube, a rod lengthwise within the tube, permanent magnets with opposing polarities at opposing ends of the tube, an annular oscillatory magnet in the tube and between the magnets and around the rod; and a primary coil around the tube and oscillatory magnet, such that relative movement between the magnet and coil induces electrical current in the coil; and (b) a magnetostrictive mode comprising: piezoelectric cymbal transducers on opposing ends of the tube and comprising a magnetostrictive material surrounded by a secondary coil, such that movement of the magnetostrictive material induces voltage in the secondary coil. During use, electrical energy can be harvested from the relative motion between the magnet and coil and from the magnetostrictive material.
    Type: Application
    Filed: February 1, 2013
    Publication date: August 1, 2013
    Applicant: VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.
    Inventor: Virginia Tech Intellectual Properties, Inc.
  • Publication number: 20130178614
    Abstract: Embodiments of the invention provide regioselectively substituted carbohydrate and polysaccharide derivatives, such as cellulose esters, and methods for preparing them. Particular methods of the invention include deacylation of esters using tetrabutylammonium fluoride to obtain selective substitution at desired hydroxyl position(s) of the ester. Preferred is deacylation of an ester, which shows selectivity for removal of acyl groups from the ester of the secondary alcohols at C-2 and C-3, and which affords cellulose-6-O-esters with high regioselectivity by a simple one-step process employing no protective groups. Inventive regioselectively substituted cellulose esters can be prepared by such methods to obtain esters with the following anhydroglucose repeating units: wherein R1, R2, and R3 are each independently chosen from a hydrogen atom, and, whether substituted or unsubstituted, branched or unbranched, an alkanoyl group, an aroyl group, and a heteroaroyl group.
    Type: Application
    Filed: October 25, 2012
    Publication date: July 11, 2013
    Applicant: Virginia Tech Intellectual Properties, Inc.
    Inventor: Virginia Tech Intellectual Properties, Inc.
  • Patent number: 8483351
    Abstract: The present invention provides systems, methods, and devices for improved computed tomography (CT). More specifically, the present invention includes methods for improved cone-beam computed tomography (CBCT) resolution using improved filtered back projection (FBP) algorithms, which can be used for cardiac tomography and across other tomographic modalities. Embodiments provide methods, systems, and devices for reconstructing an image from projection data provided by a computed tomography scanner using the algorithms disclosed herein to generate an image with improved temporal resolution.
    Type: Grant
    Filed: October 28, 2010
    Date of Patent: July 9, 2013
    Assignee: Virginia Tech Intellectual Properties, Inc.
    Inventors: Ge Wang, Jun Zhao, Yang Lu, Hengyong Yu, Alexander Katsevich
  • Patent number: 8473754
    Abstract: A hardware-facilitated secure software execution environment provides protection of both program instructions and data against unauthorized access and/or execution to maintain confidentiality and integrity of the software or the data during distribution, in external memories, and during execution. The secure computing environment is achieved by using a hardware-based security method and apparatus to provide protection against software privacy and tampering. A Harvard architecture CPU core is instantiated on the same silicon chip along with encryption management unit (EMU) circuitry and secure key management unit (SKU) circuitry. Credential information acquired from one or more sources is combined by the SKU circuitry to generate one or more security keys provided to the EMU for use in decrypting encrypted program instructions and/or data that is obtained from a non-secure, off-chip source such as an external RAM, an information storage device or other network source.
    Type: Grant
    Filed: February 20, 2007
    Date of Patent: June 25, 2013
    Assignees: Virginia Tech Intellectual Properties, Inc., Macaulay-Brown, Inc.
    Inventors: Mark T. Jones, Peter M. Athanas, Cameron D. Patterson, Joshua N. Edmison, Anthony Mahar, Benjamin J. Muzal, Barry L. Polakowski, Jonathan P. Graf