Now showing items 201-220 of 619

    • Gas discharge lamp inverter with a wide input voltage range 

      Virginia Tech Intellectual Properties, Inc.; Lee, Fred C.; Qian, Jinrong (United States Patent and Trademark Office, 1999-09-07)
      A gas discharge lamp driving circuit reduces input power at start-up mode through the utilization of input power diodes and stress capacitors in parallel therewith. The circuit includes a blocking filter for filtering an ...
    • Generalized cancellation of inductor winding capacitance 

      Virginia Tech Intellectual Properties, Inc.; Lee, Fred C.; Wang, Shuo (United States Patent and Trademark Office, 2009-06-16)
      An inductor device or filter such as an electromagnetic interference (EMI) filter which includes an inductor provides cancellation of parasitic capacitance of the inductor and extends high frequency performance of the ...
    • Half-bridge zero-voltage switched multi-resonant converters 

      Virginia Tech Intellectual Properties, Inc.; Lee, Fred C.; Tabisz, Wojciech A.; Jovanovic, Milan M. (United States Patent and Trademark Office, 1989-08-22)
      A half-bridge zero-voltage-switched multi-resonant converter. The converter basically comprises a device for converting an input voltage signal to a DC output signal to be imposed across a load. The device includes input ...
    • Hardware-facilitated secure software execution environment 

      Virginia Tech Intellectual Properties, Inc.; MACAULAY-BROWN, INC.; Athanas, Peter M.; Patterson, Cameron D.; Graf, Jonathan P.; Edmison, Joshua N.; Jones, Mark T.; Mahar, Anthony; Muzal, Benjamin J.; Polakowski, Barry L. (United States Patent and Trademark Office, 2013-06-25)
      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 ...
    • Heat flux gage 

      Virginia Polytechnic Institute and State University; Diller, Thomas E.; Onishi, Shinzo (United States Patent and Trademark Office, 1988-10-25)
      The invention is a heat flux gage applied to a surface, for the measurement of surface heat transfer. All elements of the gage are thin films, deposited on the surface by sputtering or an equivalent process. The gage ...
    • High abrasion resistance coating materials from organic/inorganic hybrid materials produced by the sol-gel method 

      Virginia Tech Intellectual Properties, Inc.; Wang, Bing; Wilkes, Garth L. (United States Patent and Trademark Office, 1994-05-31)
      A series of new high abrasion resistance coating materials have been prepared utilizing organic/inorganic hybrid materials formed by cohydrolyzing a metal alkoxide sol (e.g. silicon, aluminum, titanium, or zirconium metal ...
    • High abrasion resistant coating material 

      Virginia Tech Intellectual Properties, Inc.; Wilkes, Garth L.; Wen, Jianye; Jordens, Kurt Joseph (United States Patent and Trademark Office, 2000-06-06)
      An abrasion resistant coating for a substrate, particularly a transparent polymeric substrate or a metallic substrate, includes a cured inorganic/organic hybrid network material formed by a sol-gel co-condensation of at ...
    • High frequency integrated point-of-load power converter with embedded inductor substrate 

      Virginia Tech Intellectual Properties, Inc.; Li, Qiang; Lee, Fred C.; Su, Yipeng; Zhang, Wenli (United States Patent and Trademark Office, 2017-02-07)
      A low profile power converter structure is provide wherein volume is reduced and power density is increased to approach 1 KW/in3 by at least one of forming an inductor as a body of magnetic material embedded in a substrate ...
    • High frequency loss measurement apparatus and methods for inductors and transformers 

      Virginia Tech Intellectual Properties, Inc.; Lee, Fred C.; Mu, Mingkai (United States Patent and Trademark Office, 2014-09-02)
      Core loss in an inductor is measured with reduced sensitivity to phase measurement error by connecting a reactive component to resonate with the inductor and thus cancel a portion of the reactive voltage on the inductor; ...
    • High input voltage, high efficiency, fast transient voltage regulator module (VRM) 

      Virginia Tech Intellectual Properties, Inc.; Lee, Fred C.; Zhou, Xunwei (United States Patent and Trademark Office, 2003-07-08)
      A high input-voltage push-pull forward voltage regulator module (VRM) has high efficiency and fast transient response. The VRM has a primary side wherein two switches and two primary transformer windings are alternately ...
    • High refractive index thermoplastic polyphosphonates 

      Johnson & Johnson Vision Care, Inc.; Virginia Tech Intellectual Properties, Inc.; McGrath, James E.; Bhatnagar, Atul; Shobha, Hosadurga K.; Sekharipuram, Venkat (United States Patent and Trademark Office, 2001-09-11)
      High refractive index, melt processable polyphosphonates and methods for preparing the same are provided. These polymers are particularly useful for optical and ophthalmic parts, such as lenses. A method of preparing optical ...
    • High refractive index thermoplastic polyphosphonates 

      Essilor International (Compagnie Generale d'Optique); Virginia Tech Intellectual Properties, Inc.; McGrath, James E.; Bhatnagar, Atul; Shobha, Hosadurga K.; Sekharipuram, Venkat (United States Patent and Trademark Office, 2006-06-27)
      High refractive index, melt processable polyphosphonates and methods for preparing the same are provided. These polymers are particularly useful for optical and ophthalmic parts, such as lenses. A method of preparing optical ...
    • High refractive index thermoplastic polyphosphonates 

      Johnson & Johnson Vision Care, Inc.; Virginia Tech Intellectual Properties, Inc.; McGrath, James E.; Bhatnagar, Atul; Shobha, Hosadurga K.; Sekharipuram, Venkat (United States Patent and Trademark Office, 2003-11-25)
      High refractive index, melt processable polyphosphonates and methods for preparing the same are provided. These polymers are particularly useful for optical and ophthalmic parts, such as lenses. A method of preparing optical ...
    • High refractive-index ceramic/polymer hybrid material 

      Virginia Tech Intellectual Properties, Inc.; Wang, Bing; Wilkes, Garth L. (United States Patent and Trademark Office, 1992-04-28)
      New hybird materials prepared by incorporating a metal alkoxide sol, which is adapted to yield a high refractive-index metal oxide (e.g., titanium dioxide or zirconium dioxide), with a high refractive-index organic polymeric ...
    • High refractive-index hybrid material prepared by titanium alkoxide and a phosphine containing oligomer 

      Virginia Tech Intellectual Properties, Inc.; Wang, Bing; Wilkes, Garth L. (United States Patent and Trademark Office, 1992-09-01)
      New hybrid materials have been prepared by combining a titanium alkoxide sol with high a refractive index phosphine oxide-containing oligomeric component (triethoylsilane-capped poly(arylene ether phosphine oxide). These ...
    • High temperature ceramic particulate filter 

      Center for Innovative Technology; Virginia Polytechnic Institute; State University Virginia Tech Intellectual Properties, Inc.; Gonzalez, Sandra; Brown, Nancy R.; Brown, Jr., Jesse J. (United States Patent and Trademark Office, 1992-02-11)
      A high temperature ceramic filter is produced from a composition containing efractory cement, aggregate, pore forming additives, and sintering agents. The pore forming additives are synthetic or organic powders or fibers ...
    • High temperature electrode-barriers for ferroelectric and other capacitor structures 

      Virginia Tech Intellectual Properties, Inc.; Sharp Kabushiki Kaisha; Desu, Seshu B.; Vijay, Dilip P.; Bhatt, Hemanshu D.; Hwang, Yoo-Sang (United States Patent and Trademark Office, 1998-08-04)
      A capacitor for use on silicon or other substrate has a multilayer electrode structure. In a preferred embodiment, a bottom electrode situated on the substrate has a bottom layer of Pt--Rh--O.sub.x, an intermediate layer ...
    • Highly conductive thermoplastic composites for rapid production of fuel cell bipolar plates 

      Virginia Tech Intellectual Properties, Inc.; McGrath, James E.; Baird, Donald G.; Huang, Jianhua (United States Patent and Trademark Office, 2008-04-29)
      A low cost method of fabricating bipolar plates for use in fuel cells utilizes a wet lay process for combining graphite particles, thermoplastic fibers, and reinforcing fibers to produce a plurality of formable sheets. The ...
    • Highly-oriented fibrous mats 

      Virginia Tech Foundation, Inc.; Scheinberg, Stephen P. (United States Patent and Trademark Office, 2004-06-08)
      A mat containing highly machine direction oriented (90% or greater), discontinuous reinforcement fibers, is produced on inclined wire or rotary paper making machinery. Fibers are first uniformly dispersed in an aqueous ...
    • HMG2 promoter expression system 

      Virginia Tech Intellectual Properties, Inc.; Cramer, Carole Lyn; Weissenborn, Deborah Louise (United States Patent and Trademark Office, 1997-11-18)
      The promoter elements of plant HMG2 HMGR genes are described. The HMG2 promoter elements are responsive to pathogen-infection, pest-infestation, wounding, or elicitor or chemical treatments. The HMG2 elements are also ...