Patents by Inventor David N. Lambeth

David N. Lambeth 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: 10255545
    Abstract: A payment card (e.g., credit and/or debit card) is provided with a magnetic emulator operable of communicating information to a magnetic stripe reader. Information used in validating a financial transaction is encrypted based on time such that a validating server requires receipt of the appropriate encrypted information for a period of time to validate a transaction for that period of time. Such dynamic information may be communicated using such an emulator such that a card may be swiped through a magnetic stripe reader—yet communicate different information based on time. An emulator may receive information as well as communicate information to a variety of receivers (e.g., an RFID receiver).
    Type: Grant
    Filed: August 1, 2016
    Date of Patent: April 9, 2019
    Assignee: DYNAMICS INC.
    Inventors: Jeffrey D. Mullen, David N. Lambeth, Bruce Cloutier
  • Patent number: 10223631
    Abstract: A payment card (e.g., credit and/or debit card) is provided with a magnetic emulator operable of communicating information to a magnetic stripe reader. Information used in validating a financial transaction is encrypted based on time such that a validating server requires receipt of the appropriate encrypted information for a period of time to validate a transaction for that period of time. Such dynamic information may be communicated using such an emulator such that a card may be swiped through a magnetic stripe reader—yet communicate different information based on time. An emulator may receive information as well as communicate information to a variety of receivers (e.g., an RFID receiver).
    Type: Grant
    Filed: August 1, 2016
    Date of Patent: March 5, 2019
    Assignee: DYNAMICS INC.
    Inventors: Jeffrey D. Mullen, David N. Lambeth, Bruce Cloutier
  • Patent number: 8602312
    Abstract: Dynamic magnetic stripe communications devices are provided as magnetic stripe emulators. A magnetic stripe emulator may include a coil. Drive circuits may be coupled to this coil in order to produce electromagnetic fields from the coil operable to communicate with a magnetic stripe reader.
    Type: Grant
    Filed: February 16, 2011
    Date of Patent: December 10, 2013
    Assignee: Dynamics Inc.
    Inventors: Bruce S. Cloutier, David N. Lambeth, James H. Workley
  • Patent number: 8590796
    Abstract: A card is fabricated by fixing together multiple boards. By fabricating a card from multiple boards, the reliabilities of the individual boards may be tested independently. Failure of a single board component may not, for example, result in failure of a card so long as the reliability of a single board is determined before the single board component is fixed to the other board component(s).
    Type: Grant
    Filed: February 22, 2010
    Date of Patent: November 26, 2013
    Assignee: Dynamics Inc.
    Inventors: Bruce S. Cloutier, James H. Workley, David N. Lambeth, Jeffrey D. Mullen
  • Patent number: 8579203
    Abstract: A card (e.g., a payment card) or device (e.g., a token or phone) is provided with a magnetic emulator having a soft magnetic material whose reluctance is controlled.
    Type: Grant
    Filed: November 23, 2011
    Date of Patent: November 12, 2013
    Assignee: Dynamics Inc.
    Inventors: David N. Lambeth, Bruce S. Cloutier
  • Patent number: 8540209
    Abstract: A flow modulation valve has a slidably translating hollow armature with at least one energizable coil wound around and fixably attached to the hollow armature. The energizable coil or coils are influenced by at least one permanent magnet surrounding the hollow armature and supported by an outer casing. Lorentz forces on the energizable coils which are translated to the hollow armature, increase or decrease the flow area to provide flow throttling action. The extent of hollow armature translation depends on the value of current supplied and the direction of translation depends on the direction of current flow. The compact nature of the flow modulation valve combined with the high forces afforded by the actuator design provide a flow modulation valve which is highly responsive to high-rate input control signals.
    Type: Grant
    Filed: September 15, 2011
    Date of Patent: September 24, 2013
    Assignee: University of Pittsburgh—Of the Commonwealth System of Higher Education
    Inventors: John Peter Hensel, Nathaniel Black, Jimmy Dean Thorton, Jeffrey Stuart Vipperman, David N. Lambeth, William W. Clark
  • Publication number: 20120061596
    Abstract: A flow modulation valve has a slidably translating hollow armature with at least one energizable coil wound around and fixably attached to the hollow armature. The energizable coil or coils are influenced by at least one permanent magnet surrounding the hollow armature and supported by an outer casing. Lorentz forces on the energizable coils which are translated to the hollow armature, increase or decrease the flow area to provide flow throttling action. The extent of hollow armature translation depends on the value of current supplied and the direction of translation depends on the direction of current flow. The compact nature of the flow modulation valve combined with the high forces afforded by the actuator design provide a flow modulation valve which is highly responsive to high-rate input control signals.
    Type: Application
    Filed: September 15, 2011
    Publication date: March 15, 2012
    Inventors: John Peter Hensel, Nathaniel Black, Jimmy Dean Thorton, Jeffrey Stuart Vipperman, David N. Lambeth, William W. Clark
  • Publication number: 20120037709
    Abstract: Dynamic magnetic stripe communications devices are provided as magnetic stripe emulators. A magnetic stripe emulator may include a coil. Drive circuits may be coupled to this coil in order to produce electromagnetic fields from the coil operable to communicate with a magnetic stripe reader.
    Type: Application
    Filed: February 16, 2011
    Publication date: February 16, 2012
    Inventors: Bruce S. Cloutier, David N. Lambeth, James H. Workley
  • Patent number: 7128988
    Abstract: A thin film magnetic structure, magnetic devices, and method of producing the same, wherein (110) textured, symmetry broken body centered cubic or body centered cubic derivative crystalline structures epitaxially grown on hexagonal shaped templates, in the presence of a symmetry breaking mechanism is provided to promote oriented uniaxial magnetic properties from a series of successively deposited film layers, result in new oriented magnetic layer structures and microstructures and thus improved magnetic devices and device performance.
    Type: Grant
    Filed: August 29, 2002
    Date of Patent: October 31, 2006
    Assignee: Lambeth Systems
    Inventor: David N. Lambeth
  • Patent number: 7056455
    Abstract: The present invention comprises a novel process for the preparation of carbon based structured materials with controlled topology, morphology and functionality. The nanostructured materials are prepared by controlled carbonization, or pyrolysis, of precursors comprising phase separated copolymers. The precursor materials are selected to phase separate and self organize in bulk, in solution, in the presence of phase selective solvents, at surfaces, interfaces or during fabrication, into articles, fibers or films exhibiting well-defined, self-organized morphology or precursors of well-defined, self-organized, bi- or tri-phasic morphology. Compositional control over the (co)polymers provides control over the structure of the phase separated precursor whose organization therein dictates the nanostructure of the material obtained after carbonization or pyrolysis, wherein each dimension of the formed structure can be predetermined.
    Type: Grant
    Filed: April 6, 2002
    Date of Patent: June 6, 2006
    Assignee: Carnegie Mellon University
    Inventors: Krzysztof Matyjaszewski, Tomasz Kowalewski, David N. Lambeth, James Spanswick, Nicolay V. Tsarevsky
  • Publication number: 20040058196
    Abstract: A thin film magnetic structure, magnetic devices, and method of producing the same, wherein (110) textured, symmetry broken body centered cubic or body centered cubic derivative crystalline structures epitaxially grown on hexagonal shaped templates, in the presence of a symmetry breaking mechanism is provided to promote oriented uniaxial magnetic properties from a series of successively deposited film layers, result in new oriented magnetic layer structures and microstructures and thus improved magnetic devices and device performance.
    Type: Application
    Filed: August 29, 2003
    Publication date: March 25, 2004
    Inventor: David N Lambeth
  • Patent number: 6649277
    Abstract: The present invention provides a longitudinal magnetic recording media having a substrate, optionally, a sputter deposited MgO seed layer, a Co or Co alloy based magnetic layer and an underlayer disposed between the substrate and the magnetic layer comprised of a material having a body centered cubic derivative ordered crystalline structure, preferably a B2, DO3 or L21 structure. The material may be for example, NiAl, FeAl or Mn3Si. A thin Cr or Cr alloy intermediate layer of about 1.0 nm to 5.0 nm thick may be positioned between the underlayer and the magnetic layer.
    Type: Grant
    Filed: April 17, 2000
    Date of Patent: November 18, 2003
    Assignee: Carnegie Mellon University
    Inventors: Li-Lien Lee, David N. Lambeth, David E. Laughlin, Byung-Ki Cheong
  • Publication number: 20030185741
    Abstract: The present invention comprises a novel process for the preparation of carbon based structured materials with controlled topology, morphology and functionality. The nanostructured materials are prepared by controlled carbonization, or pyrolysis, of precursors comprising phase separated copolymers. The precursor materials are selected to phase separate and self organize in bulk, in solution, in the presence of phase selective solvents, at surfaces, interfaces or during fabrication, into articles, fibers or films exhibiting well-defined, self-organized morphology or precursors of well-defined, self-organized, bi- or tri-phasic morphology. Compositional control over the (co)polymers provides control over the structure of the phase separated precursor whose organization therein dictates the nanostructure of the material obtained after carbonization or pyrolysis, wherein each dimension of the formed structure can be predetermined.
    Type: Application
    Filed: April 6, 2002
    Publication date: October 2, 2003
    Inventors: Krzysztof Matyjaszewski, Tomasz Kowalewski, David N. Lambeth, James Spanswick, Nicolay V. Tsarevsky
  • Patent number: 6596417
    Abstract: The present invention provides a longitudinal magnetic recording media having a substrate, a Co or Co alloy based magnetic layer arid an underlayer disposed between the substrate and the magnetic layer. The underlayer is made of a material having a Ga3Pt5 crystalline structure, most preferably Ni5Al3. Several intermediate layers, disposed between the underlayer and the magnetic layer may also be included.
    Type: Grant
    Filed: September 29, 2000
    Date of Patent: July 22, 2003
    Assignee: Carnegie Mellon University
    Inventors: Yu-Nu Hsu, David E. Laughlin, David N. Lambeth
  • Patent number: 6432563
    Abstract: The present invention provides a magnetic recording media incorporating Zn containing layers in close proximity to a magnetic layer to provide media having increased coercivity and lower noise. The Zn containing layer can be incorporated in a rotating, translating or stationary recording media to operate in conjunction with magnetic transducing heads for recording and reading of magnetic data, as well as other applications. The magnetic recording medium of the invention preferably includes a Co or Co alloy film magnetic layer, underlayer structures to promote epitaxial crystalline structure in the magnetic layer, and a Zn containing layer to promote isolation between the magnetic grains. The medium can further include seed layers, underlayers, intermediate layers, and overlayers. The process of manufacture includes promoting diffusion of Zn to the magnetic layer grain boundaries.
    Type: Grant
    Filed: April 3, 2000
    Date of Patent: August 13, 2002
    Assignee: Carnegie Mellon University
    Inventors: Jie Zou, David N. Lambeth, David E. Laughlin
  • Patent number: 6248416
    Abstract: The present invention provides for magnetic and magneto-optic recording media, transducers and data storage devices constructed therefrom that have highly oriented films having long range order in the crystal structure of the film. The recording medium includes a magnetic recording layer comprised of Co-based material, such as Co or one or more Co alloys having a (10{overscore (1)}0) crystal texture, a substrate, a first underlayer having a fcc structure and a (110) crystal texture disposed between the substrate and the magnetic recording layer. A second underlayer having a bcc structure and a (112) crystal texture is also disposed between the magnetic recording layer and the first underlayer. In particular, if a (110) Si single crystal substrate is non-oxidized certain metals having fcc structures, such as Ag, Cu, Al, and Au and fcc derivative structures, such L10 and L12 structures, can be epitaxially grown on the Si surface.
    Type: Grant
    Filed: November 10, 1997
    Date of Patent: June 19, 2001
    Assignee: Carnegie Mellon University
    Inventors: David N. Lambeth, David E. Laughlin, Wei Yang, Heng Gong, Jie Ziou
  • Patent number: 6111507
    Abstract: A device for deactivating a magnetomechanical EAS marker includes two coils and an energizing circuit for alternately driving the coils. One coil is driven for one cycle of an alternating power signal, and then the other coil is driven for one cycle, and this sequence is repeated. The driving signal is switched from one coil to the other at a point in time which corresponds to a zero crossing of the current level of the driving signal.
    Type: Grant
    Filed: July 6, 1998
    Date of Patent: August 29, 2000
    Assignee: Sensormatic Electronics Corporation
    Inventors: Jorge Fernando Alicot, Douglas A. Narlow, Richard L. Copeland, David N. Lambeth
  • Patent number: 5993956
    Abstract: The present invention provides for a magnetic recording media incorporating Mn-containing layers between a substrate and a magnetic layer to provide media having increased coercivity and lower noise. The Mn-containing layer can be incorporated in a rotating, translating or stationary recording media to operate in conjunction with magnetic transducing heads for recording and reading of magnetic data, as well as other applications. The magnetic recording medium of the invention preferably includes a Co or Co alloy film magnetic layer, and Mn-containing layer, preferably comprised of VMn, TiMn, MnZn, CrMnMo, CrMnW, CrMnV, and CrMnTi, and most preferably a CrMn alloy, disposed between the substrate and the magnetic layer to promote an epitaxial crystalline structure in the magnetic layer. The medium can further include seed layers, preferably polycrystalline MgO for longitudinal media, underlayers, and intermediate layers.
    Type: Grant
    Filed: April 22, 1997
    Date of Patent: November 30, 1999
    Assignee: Carnegie Mellon University
    Inventors: David N. Lambeth, Li-Lien Lee, David E. Laughlin
  • Patent number: 5969612
    Abstract: A magnetomechanical EAS marker is formed of a housing, a magnetostrictive active element in the housing and a bias element fixedly mounted on the housing. A central portion of the active element is secured to the housing to keep the active element from shifting in a longitudinal direction relative to the bias element and to keep ends of the active element spaced from the housing. The active element remains free to mechanically resonate in response to an EAS interrogation signal. The stable positioning of the active element prevents variations in the bias magnetic field due to shifting relative to the bias element, while keeping ends of the active element free from frictional damping due to mechanical loading from contact with the housing.
    Type: Grant
    Filed: July 6, 1998
    Date of Patent: October 19, 1999
    Assignee: Sensormatic Electronics Corporation
    Inventors: Dennis M. Gadonniex, Ming-Ren Lian, David N. Lambeth, Robert C. O'Handley, Wing K. Ho
  • Patent number: 5800931
    Abstract: The present invention provides a longitudinal magnetic recording media having a substrate, a sputter deposited MgO seed layer, a Co or Co alloy based magnetic layer and an underlayer disposed between the seed layer and the magnetic layer comprised of Cr, a Cr alloy or a material having a B2 ordered crystalline structure, preferably NiAl or FeAl. A thin Cr or Cr alloy intermediate layer of about 1.0 nm to 5.0 nm thick may be positioned between the underlayer and the magnetic layer.
    Type: Grant
    Filed: November 6, 1995
    Date of Patent: September 1, 1998
    Assignee: Carnegie Mellon University
    Inventors: Li-Lien Lee, David N. Lambeth, David E. Laughlin, Byung-Ki Cheong