Patents Represented by Law Firm Pravel, Gambrell, Hewitt & Kimball
  • Patent number: 5180394
    Abstract: Orthopedic implants of zirconium or zirconium-based alloy coated with blue or blue-black zirconium oxide or zirconium nitride to provide low friction, highly wear resistant coatings especially useful in artificial joints, such as hip joints, knee joints, elbows, etc. The invention zirconium oxide or nitride coated prostheses are also useful in that the coatings provide a barrier against implant corrosion caused by ionization of the metal prosthesis. Such protection can be extended by the use of oxidized or nitrided porous coatings of zirconium or zirconium alloy beads or wire mesh into which bone spicules may grow so that the prosthesis may be integrated into the living skeleton.
    Type: Grant
    Filed: November 18, 1991
    Date of Patent: January 19, 1993
    Inventor: James A. Davidson
  • Patent number: 5179888
    Abstract: A control force input system for a balance beam pneumatic valve positioner which does not allow the controlled apparatus to make a full travel motion when the overall control signal is removed. The control force is transmitted to the balance beam or other force summing bar using a linear solenoid coupled to a control spring coupled to the balance beam. When the motive power control signal is removed from the linear solenoid, the balance beam establishes an equilibrium position based on the existing position of the linear solenoid. Split wedges are repelled from the linear solenoid when a control signal is applied, releasing the solenoid shaft for movement. Alternatively, split slides are repelled from each other when a control signal is applied, releasing the solenoid shaft bias spring. When the control signal is removed, the split wedges or split slides are biased and attracted to the solenoid, locking the solenoid shaft in position. A variation for use with a current to pressure transducer is detailed.
    Type: Grant
    Filed: April 2, 1991
    Date of Patent: January 19, 1993
    Assignee: Topworks, Inc.
    Inventors: Robert E. Schendel, Chris M. Leinen
  • Patent number: 5179950
    Abstract: An implant for stimulating the vagus nerve receives commands over a radio frequency link. The implant disables a voltage convertor used in providing the stimulation signal at periodic intervals to monitor for communications attempts. The implant provides radio frequency marker pulses before providing stimulation signals of certain frequencies. During the providing of stimulation signals the implant monitors the voltage overhead present between the voltage source and the load and adjusts the overhead to a desired level. The implant changes the voltage applied to certain internal components during stimulation periods to allow full power operation during those intervals and reduced power levels at other intervals. The implant is reset by the placing of a magnet in a given location in conjunction with the application of a radio frequency transmission for a given period.
    Type: Grant
    Filed: December 5, 1991
    Date of Patent: January 19, 1993
    Assignee: Cyberonics, Inc.
    Inventor: Henry Stanislaw
  • Patent number: 5180012
    Abstract: An invention relating to method and apparatus for the running of various tools and devices used to service oil and gas wells in combination with coiled tubing units that permits the application of a sudden downward force of predetermined magnitude.
    Type: Grant
    Filed: June 4, 1991
    Date of Patent: January 19, 1993
    Inventor: James B. Crawford
  • Patent number: 5179474
    Abstract: Viewer apparatus for object sorting machines and illumination system for such viewers, the viewer in one embodiment having a housing with a viewing device and a light source mounted therein and an opening through which objects to be sorted pass, with one or more reflectors disposed in the housing to reflect light onto portions of the object.
    Type: Grant
    Filed: March 21, 1991
    Date of Patent: January 12, 1993
    Assignee: Delta Technology Corporation
    Inventors: Roger F. Bailey, Elias H. Codding
  • Patent number: 5178868
    Abstract: The invention relates to an oral pharmaceutical multiple units formulation made up of individual cores containing a pharmacologically active substance, the cores being provided with a coating consisting essentially of a polymer that is insoluble in, impermeable to and non-soluble in water and in gastrointestinal fluids, and a water-soluble pore-creating substance, which is randomly distributed in said polymer, whereby said coated cores form units providing an essential zero order diffusion controlled release rate of said active substance. The invention also comprises a method of preparing these formulations.
    Type: Grant
    Filed: October 4, 1991
    Date of Patent: January 12, 1993
    Assignee: Kabi Pharmacia Aktiebolaq
    Inventors: Karin Malmqvist-Granlund, Christer Hermansson, Soren Kulstad
  • Patent number: 5178593
    Abstract: Disclosed is an exercise apparatus that is a combination stationary recumbent cycle-type exerciser and an upper body exerciser, and a method of exercising. In the stationary recumbent cycle mode, the seated operator pedals a conventional pedal mechanism. In the upper body exerciser mode, the operator is in a normal push-up position with the hands on the pedals of the pedal mechanism. Exercising is accomplished by hand pedaling the pedal mechanism while supporting the body weight on the feet and hands. The machine has an adjustment to help support the operator's chest with a chest pad.
    Type: Grant
    Filed: July 5, 1991
    Date of Patent: January 12, 1993
    Inventor: Mark J. Roberts
  • Patent number: 5178218
    Abstract: Methods are provided for chemically consolidating subterranean formations around wells using resins. Resins are forced into the formations by high pressures instantaneously applied when perforations are formed in casing in wells or when pressures are released from tubing in wells. Perforating, explosives or gas generators may be used in addition to the high pressures for driving resins into formations. The resins are polymerized to form permeable consolidated zones around wells.
    Type: Grant
    Filed: June 19, 1991
    Date of Patent: January 12, 1993
    Assignee: Oryx Energy Company
    Inventor: John M. Dees
  • Patent number: 5178276
    Abstract: A support apparatus for stacking bottles of water in a vertical fashion one atop the other includes a bottom support having an inclined side wall with a lower annular rim that fits against the top end portion of a lowermost bottle. An upper support registers with the bottom support and includes a plurality of radially extending struts that provide a surface for conforming to the bottom of an uppermost bottle.
    Type: Grant
    Filed: February 25, 1992
    Date of Patent: January 12, 1993
    Inventor: Kerney T. Sheets
  • Patent number: 5178429
    Abstract: A recovery head for use in retrieving a submerged pipeline to the water surface. The recovery head includes a center of gravity arm attached to one end of the recovery head by a connecting pin. The center of gravity arm maintains the recovery head in a level orientation to allow divers or an ROV to more easily insert the head into the pipeline. After insertion into the pipeline, the center of gravity arm is removed from the recovery head. With the center of gravity arm removed, the recovery head does not obstruct or interfere with any steps involved in the actual retrieval and securing of the pipeline on the lay barge. The rear portion of the recovery head includes two T-posts which connect to oval links attached to the end of a retrieving cable. The links are such that, when placed over the T-posts and the retrieval cable is pulled to retrieve the pipeline to the surface, the links rotate.
    Type: Grant
    Filed: July 12, 1991
    Date of Patent: January 12, 1993
    Assignee: Diverless Systems, Inc.
    Inventors: David A. Gray, Walter E. Gray, Jr.
  • Patent number: 5178318
    Abstract: A rigid-flex printed circuit board having a rigid section and a flexible section extending from the rigid section is disclosed. The rigid-flex printed circuit board is capable of withstanding high temperatures experienced in high volume production environments utilizing infrared reflow ovens by providing spacers and covers for protecting the flexible section from high temperatures. A process for assembling components and devices on the rigid-flex printed circuit board in a high volume production environment utilizing infrared reflow ovens is also disclosed.
    Type: Grant
    Filed: June 6, 1991
    Date of Patent: January 12, 1993
    Assignee: Compaq Computer Corp.
    Inventors: Eric R. Edwin, James J. Tumlinson, Jerome A. Wilson, Thad C. McMillan, Jr., Rollin G. Meyer, Darryl J. McKenney
  • Patent number: 5177114
    Abstract: This invention comprises a method for converting natural gas to a normally liquid carbon containing compound, such as methanol and/or dimethyl ether and/or to gasoline grade liquid hydrocarbons and/or olefins. The method of this invention eliminates the need for steam reforming and/or adiabatic reforming with essentially pure oxygen of the natural gas to a synthesis gas. In accordance with the process of this invention, a synthesis gas may be produced at an operating pressure suitable for conversion thereof to methanol and/or dimethyl ether without the need for synthesis gas recompression. Further, the vent or bleed gas from the overheads after conversion to the crude product methanol/DME and/or its conversion to gasoline grade liquid hydrocarbons, generally has a BTU capacity required to serve as a fuel gas for supplying the energy needed for operation of a gas turbine which powers the gas compression equipment requirements by which the process of this invention may be practiced.
    Type: Grant
    Filed: March 30, 1992
    Date of Patent: January 5, 1993
    Assignee: Starchem Inc.
    Inventors: Christiaan P. Van Dijk, Lowell D. Fraley
  • Patent number: 5176268
    Abstract: A railroad car having an improved draft gear assembly including a center sill structure terminating at one end in a draft center sill section having a yoke mounted therewith. The yoke includes first and second yoke members extending longitudinally. An interlocking coupler member including a head portion and a shank portion is mounted with the yoke. A connector assembly holds the interlocking coupler member in position in the yoke. The interlocking coupler member includes a rear butt portion positioned internally of the connector assembly for engaging a follower block mounted substantially between the first and second yoke members. A resilient member is mounted between the follower block assembly and the end of the yoke.
    Type: Grant
    Filed: June 11, 1991
    Date of Patent: January 5, 1993
    Assignee: Houston Industries Incorporated
    Inventor: R. Michael Manley
  • Patent number: 5177371
    Abstract: A power supply which senses whether a primary battery is discharging to below a predetermined dead battery level or the primary battery has been removed and the system is operating from an auxiliary battery, which has a lower voltage. When the battery voltage goes below the dead voltage level, the system is in a low power mode and the power supply output voltages are satisfactory, a timer may be started. If the battery voltage does not drop to the auxiliary battery voltage level within a predetermined time, a shutdown signal is generated and the power supply ceases providing output voltage levels. In this manner the primary battery can be removed and the system can continue running on the auxiliary battery until a charged primary battery is installed and yet the primary battery discharge rate will be greatly slowed when the primary battery voltage is below a given level and the primary battery is still installed in the system.
    Type: Grant
    Filed: October 12, 1990
    Date of Patent: January 5, 1993
    Assignee: Compaq Computer Corporation
    Inventor: Richard A. Faulk
  • Patent number: 5177387
    Abstract: A magnetic bearing having a rotatable member and a stationary member on one of which is mounted a superconductor while on the other is mounted a set of permanent magnets or electromagnets arranged as a quadrupole or multiple dipoles. The magnetic member, which is in the form of a dipole, a quadrupole, or other multiple dipole, such as an octopole, is positioned to enable the magnetic fields generated by the permanent magnets to interact with the superconducting material and to confine the shaft in all directions in the desired location. The bearing systems can be used as either a thrust bearing or as a journal bearing, or as both. Each dipole may be twinned to reduce magnetic field asymmetry and reduce energy dissipation upon rotation. The superconductor may be laminated, and/or additional magnets may be located outside the superconductor in order to increase the bearing stiffness and rigidity.
    Type: Grant
    Filed: December 4, 1990
    Date of Patent: January 5, 1993
    Assignee: University of Houston-University Park
    Inventors: Chase K. McMichael, Wei-Kan Chu
  • Patent number: 5175515
    Abstract: An electrical system wherein the electrical conductive traces on the circuit boards are routed to achieve a balanced net to reduce noise caused by transmission line reflections. A trace is routed from the source terminal of the net to a balanced junction wherein if there are an odd number of load terminals, or loads, the balanced junction is located at one of the loads. The remaining loads are grouped into branches wherein each branch includes an equal number of loads. A trace is routed between each of the loads of each branch to serially connect the loads of each branch together, or, a trace is routed from a center one of the branch loads to each of the remaining branch loads, forming subbranches. In an alternate embodiment, a balanced subbranch is developed. The balanced load is connected to a pseudo-balanced load, which further receives an equal number of branches. The pseudo-balanced load is then connected to another pseudo-balanced load, which may also receive an equal number of branches.
    Type: Grant
    Filed: June 21, 1991
    Date of Patent: December 29, 1992
    Assignee: Compaq Computer Corporation
    Inventors: Michael G. Abernathy, Angie M. Fletcher, Paul Santeler, Roy E. Thomas, III
  • Patent number: 5175708
    Abstract: An acoustic transponder device includes waterproof housing that accepts a battery pack with a water displacing connection placing the housing and battery pack in communication. The housing carries an electronics package. Both the housing and battery pack can be disposable components, and can be sealed upon manufacture to prevent water ingress.
    Type: Grant
    Filed: March 4, 1992
    Date of Patent: December 29, 1992
    Assignee: Navigation Technology Corporation
    Inventor: Alex Dumestre, III
  • Patent number: D332014
    Type: Grant
    Filed: August 17, 1989
    Date of Patent: December 29, 1992
    Assignee: Sports Designs by Jesse Barfield, Inc.
    Inventor: Jesse Barfield
  • Patent number: D332512
    Type: Grant
    Filed: March 12, 1990
    Date of Patent: January 12, 1993
    Inventor: Aaron L. Bernard
  • Patent number: D332533
    Type: Grant
    Filed: March 16, 1990
    Date of Patent: January 19, 1993
    Inventor: Mark Ma