Patents Represented by Attorney William F. Bahret
  • Patent number: 8145319
    Abstract: Methods and devices for treatment of osteonecrosis of the femoral head with core decompression include a dowel adapted for placement into a core decompression channel of a femoral head. A cathode at the distal end of the dowel provides electrical stimulation of bone growth in the femoral head. A method of treating osteonecrosis of the femoral head involves placing a dowel having a cathode thereon into a core decompression channel of a femoral head in a state of osteonecrosis. Electrical current is supplied to the cathode for electrical stimulation of bone growth in the femoral head.
    Type: Grant
    Filed: October 11, 2005
    Date of Patent: March 27, 2012
    Assignee: EBI, LLC
    Inventor: Bruce J. Simon
  • Patent number: 8136183
    Abstract: A modular multiple bed unit having first and second beds connected together at right angles using mating rail brackets each defining a quick-release coupler. A bracket with quick-release coupler is provided at each of the two spaced locations on the side of one rail of the first bed, and a bracket with a mating quick-release coupler is provided on the end of each rail of the second bed for perpendicular connection of the rails of the second bed to the one rail of the first bed. In one embodiment, a stud is formed on each bracket on the rail of the first bed to engage a hook on an L-shaped bracket on the end of a corresponding rail of the second bed.
    Type: Grant
    Filed: August 29, 2005
    Date of Patent: March 20, 2012
    Assignee: J Squared, Inc.
    Inventor: James N. Jannetides
  • Patent number: 8133789
    Abstract: A silicon carbide power MOSFET having a drain region of a first conductivity type, a base region of a second conductivity type above the drain region, and a source region of the first conductivity type adjacent an upper surface of the base region, the base region including a channel extending from the source region through the base region adjacent a gate interface surface thereof, the channel having a length less than approximately 0.6 ?m, and the base region having a doping concentration of the second conductivity type sufficiently high that the potential barrier at the source end of the channel is not lowered by the voltage applied to the drain. The MOSFET includes self-aligned base and source regions as well as self-aligned ohmic contacts to the base and source regions.
    Type: Grant
    Filed: May 8, 2009
    Date of Patent: March 13, 2012
    Assignee: Purdue Research Foundation
    Inventors: James A. Cooper, Maherin Matin
  • Patent number: 8104413
    Abstract: A camless automated thread cutting system for an electronic lockstitch pattern tacking sewing machine having a sewing needle driven by a main shaft and having a knife mechanism in proximity with the needle for cutting thread at the end of a pattern sewing cycle. The cutting system comprises a pneumatic cylinder for mechanically engaging the knife mechanism through a mechanical linkage in the machine, a solenoid-actuated air valve in fluid communication with the pneumatic cylinder, a programmable logic controller (PLC), and a pair of independently adjustable discs mounted on the main shaft of the sewing machine and operatively coupled to a proximity sensor which supplies an electrical signal to the PLC. The PLC is responsive to a machine signal indicative of the end of a sewing cycle and to the proximity sensor signal for generating a control signal for actuation of the valve so as to initiate and subsequently terminate a knife movement sequence at the end of the sewing cycle.
    Type: Grant
    Filed: April 28, 2009
    Date of Patent: January 31, 2012
    Assignee: ISM Services LLC
    Inventor: Felipe Rodriguez
  • Patent number: 8107397
    Abstract: A protocol for optimizing the energy for code upload to sensors in a wireless sensor network and speeding up the dissemination if multiple sources of code are available. Energy optimization is achieved by equipping each node with limited non-local topology information, which it uses to determine the time when it can go to sleep since code is not being distributed in its vicinity. Another aspect of the invention is a protocol that facilitates secure upload of code in the wireless sensor network. The secure communication protocol divides the sensor field into control groups each with a control node, and manages data exchange between nodes within a control group through the mediation of a control head which provides the common key. The keys are refreshed periodically and the control nodes are changed periodically to enhance security. The protocol facilitates secure communication between sensor nodes despite the compromise of any number of other nodes in the network.
    Type: Grant
    Filed: June 5, 2007
    Date of Patent: January 31, 2012
    Assignee: Purdue Research Foundation
    Inventors: Saurabh Bagchi, Ness B. Shroff, Issa M. I. Khalil, Rajesh K. Panta, Mark D. Krasniewski, James V. Krogmeier
  • Patent number: 8082038
    Abstract: A method for treatment of degenerative disc disease using capacitively coupled electrical stimulation. In one embodiment, a subject diagnosed as having degenerative disc disease is treated by placing first and second electrodes on the subject's body at the site of an identified disc in a state of degenerative disc disease, and applying an electric field to the identified disc via the first and second electrodes with the intent to treat the degenerative disc disease. The electric field is created with an electrical signal having a frequency within a range of 20 to 100 kHz and having a symmetrical waveform with an amplitude within a range of 0.1 to 20 volts peak-to-peak, preferably a frequency of approximately 60 kHz and an amplitude of approximately 5 volts peak-to-peak.
    Type: Grant
    Filed: July 7, 2005
    Date of Patent: December 20, 2011
    Assignee: EBI, LLC
    Inventors: Bruce J. Simon, Jean C. Gan
  • Patent number: 8077101
    Abstract: Methods and apparatus that provide grade-level RF transceivers for use in trans-grade wireless communication networks. The methods involve incorporating slot antennas into grade-level opening covers, such as manhole covers, to provide built-in antennas for transceivers that may be connected by transmission lines. The grade-level transceivers use coupling mechanisms to connect transceivers to the slot antennas by way of transmission feed lines. Multi-slot grade-level transceivers use switching mechanisms to switch between multiple slot antennas. Certain embodiments may also include adaptable RF circuitry. Trans-grade wireless communication networks use these grade-level transceivers to communicate between below-ground and above-ground portions of the network, which may be used in underground utility systems such as combined sewer systems.
    Type: Grant
    Filed: February 7, 2007
    Date of Patent: December 13, 2011
    Assignee: Purdue Research Foundation
    Inventors: John F. Mastarone, Jr., William J. Chappell
  • Patent number: 8053705
    Abstract: Laser assisted machining process and machine utilizing multiple distributed laser units that are strategically distributed around the workpiece being machined to simultaneously heat the workpiece, creating a desired temperature distribution for laser assisted machining. Sequential incremental heating from different directions and positions are used, resulting in longer tool life and shorter machining time.
    Type: Grant
    Filed: September 7, 2006
    Date of Patent: November 8, 2011
    Assignee: Purdue Research Foundation
    Inventor: Yung C. Shin
  • Patent number: 8035112
    Abstract: An intermediate product in the fabrication of a MOSFET, including a silicon carbide wafer having a substrate and a drift layer on said substrate, said drift layer having a plurality of source regions formed adjacent an upper surface thereof; a first oxide layer on said upper surface of said drift layer; a plurality of polysilicon gates above said first oxide layer, said plurality of polysilicon gates including a first gate adjacent a first of said source regions; an oxide layer over said first source region of greater thickness than said first oxide layer; and, an oxide layer over said first gate of substantially greater thickness than said oxide layer over said first source region.
    Type: Grant
    Filed: April 23, 2009
    Date of Patent: October 11, 2011
    Assignee: Purdue Research Foundation
    Inventors: James A. Cooper, Asmita Saha
  • Patent number: 8034214
    Abstract: A reciprocating film type evaporator for solvents and other chemicals which eliminates the need for a large powerful motor, and other associated equipment such as rotary gaskets, by using reciprocation, versus 360 degree rotation.
    Type: Grant
    Filed: April 12, 2007
    Date of Patent: October 11, 2011
    Assignee: Tracera LLC
    Inventors: Collin McKinney, Rob Musser
  • Patent number: 8018193
    Abstract: An enhanced torque ripple mitigation algorithm for permanent magnet synchronous machines (PMSMs), the algorithm including compensation for sensor delay.
    Type: Grant
    Filed: December 7, 2007
    Date of Patent: September 13, 2011
    Assignee: Purdue Research Foundation
    Inventors: Steven D. Pekarek, Philip B. Beccue
  • Patent number: 8012215
    Abstract: A nonmodular tibial prosthesis having a retainer for a modular bearing on the superior surface of a tibial base, a nonmodular primary bearing directly molded to the base, and a mechanical release member mounted on the tibial base in contact with the nonmodular primary bearing. The release member includes a wedge portion with a superiorly posteriorly inclined face, and is designed to be driven anteriorly upon actuation so as to force the primary bearing off of the tibial base, after which the primary bearing and release member are removed and replaced with a modular bearing.
    Type: Grant
    Filed: July 1, 2005
    Date of Patent: September 6, 2011
    Assignee: Biomet Manufacturing Corp.
    Inventors: Robert G. Metzger, Stanley E. Asnis
  • Patent number: 7997144
    Abstract: A system and method employing a piezoelectric sensor for quasi-static force measurement substantially free of drift and with improved low-frequency response. The output signal from the sensor is sampled and integrated using digital techniques that include a drift compensation algorithm. The algorithm continually monitors the sensor output and estimates bias errors that will cause the output to drift.
    Type: Grant
    Filed: May 12, 2008
    Date of Patent: August 16, 2011
    Assignee: Purdue Research Foundation
    Inventors: Steven D. Pekarek, Kevin A. Rosenbaum
  • Patent number: 7980973
    Abstract: An electrically actuated continuously variable transmission (CVT) with an electric motor coaxially mounted on one of the pulleys of the CVT and having its rotor and stator both rotating with the pulley. One of two portions of the pulley is fixed-mounted on an engine shaft or other power source shaft, and the second is relatively axially movable with respect to the first. The rotor is rotatably fixed to the second pulley portion in certain embodiments, and is rotatably connected to it in other embodiments.
    Type: Grant
    Filed: December 7, 2007
    Date of Patent: July 19, 2011
    Assignee: Purdue Research Foundation
    Inventors: John M. Starkey, Enrico N. Manes
  • Patent number: 7980972
    Abstract: A continuously variable transmission (CVT) with a roller variator as an actuator for adjusting the speed ratio of the CVT. The CVT is of the variable-diameter pulley type and has first and second variable-diameter pulleys mechanically linked by a drive belt or other flexible drive member, the pulleys each having first and second relatively axially movable pulley portions. A roller variator is operatively connected to the first pulley, preferably the drive pulley, for control of its effective diameter. The roller variator has first and second disks mounted on the axis of the first pulley, a roller interconnecting the disks, and a roller support adapted to tilt the spin axis of the roller so as to change its points of contact with the disks and thereby change the speed ratio of the variator. The first disk is rotatably fixed with respect to the first pulley portion of the first pulley, for example, the pulley portion fixed to an engine shaft.
    Type: Grant
    Filed: December 7, 2007
    Date of Patent: July 19, 2011
    Assignee: Purdue Research Foundation
    Inventors: John M. Starkey, Enrico N. Manes, Benjamin J. Rumley
  • Patent number: 7976545
    Abstract: Broaching instruments divided into multiple parts to reduce the size of incisions necessary to perform a total hip arhroplasty, minimizing trauma to tissue surrounding the hip joint. One approach is to divide the broach head into first and second segments for insertion through posterior and anterior incisions, respectively, and interconnection within the patient. Methods of preparing the proximal medullary canal of a femur for receiving a hip stem implant utilize the multi-part broaching instruments and two-incision techniques to introduce the broaching instruments into the patient for broaching the canal in preparation for receiving the implant.
    Type: Grant
    Filed: January 5, 2005
    Date of Patent: July 12, 2011
    Assignee: Biomet Manufacturing Corp.
    Inventors: Troy W. Hershberger, Kimberly S. Parcher
  • Patent number: 7969654
    Abstract: A volume Fresnel zone plate and a method of producing such a device using a femtosecond laser for direct writing of zone plates. A volume zone plate has a number of Fresnel zone plate layers designed to focus light coherently to a single spot. Embodiments include both low numerical aperture (NA) and high NA zone plates, and provide a significant increase in overall diffraction efficiency over a single Fresnel zone plate.
    Type: Grant
    Filed: October 24, 2007
    Date of Patent: June 28, 2011
    Assignee: Purdue Research Foundation
    Inventors: Okan K. Ersoy, Xianfan Xu, Pornsak Srisungsitthisunti
  • Patent number: 7907278
    Abstract: A detection system comprising detection processing means, spectral discrimination means, and temporal tracking and declaration processing means which cooperate to detect and declare a missile launch. A spatial filter isolates discrete spectral features in an image from a detector array. The discrete spectral features must pass a threshold, which may be adaptive. In a spectral discrimination step, the pixel-to-pixel separation for those pixels passing the spatial filter step is compared to a predetermined pixel spacing. The predetermined pixel spacing is determined from the optical setup and a spectral feature of interest that is contained within the emission from, for example, an ignited rocket motor or other fired projectile. In a temporal step, the pixels that have met the other criteria are tracked as candidate detections, which are declared a threat if they display characteristics of a moving threat, e.g., a MANPADS missile, RPG, mortar or the like.
    Type: Grant
    Filed: November 6, 2006
    Date of Patent: March 15, 2011
    Inventors: Lowell Williams, D. Scott Anderson, Erik J. Thoreson
  • Patent number: 7885785
    Abstract: A position observer for control-based torque ripple mitigation in permanent magnet synchronous machines (PMSMs). Rotor position is determined using data from two sources: a piezoelectric sensor for initial position and low-speed detection, and a single Hall-effect sensor for high-speed detection.
    Type: Grant
    Filed: December 7, 2007
    Date of Patent: February 8, 2011
    Assignee: Purdue Research Foundation
    Inventors: Steven D. Pekarek, Philip B. Beccue
  • Patent number: 7866982
    Abstract: An aircraft crosswind training simulator has a fixed-pitch cockpit rotatably mounted atop a platform. Rotation of the cockpit is controlled by motor controllers that are responsive to movement of the cockpit's steering control. A rotation sensor detects rotation of the cockpit and communicates with a motor controller that controls the direction and speed of a motor mounted to the platform. The motor is engaged with a drive wheel that drives the platform laterally across the floor in response to rotation of the cockpit that is detected by the rotation sensor. An instructor input switch manipulates the motor controllers to introduce additional forces to the rotation of the cockpit and/or additional forces to the lateral movement of the platform, simulating external forces present during crosswind conditions.
    Type: Grant
    Filed: April 18, 2007
    Date of Patent: January 11, 2011
    Inventor: Bradley J. Whitsitt