Abstract: A working vehicle steering system that includes: one or more steerable wheels; a steering actuation system configured to move the one or more steerable wheels between a range of steering angles; a steering angle sensor; and a controller. The controller is configured to: receive a steering angle signal from the steering angle sensor; determine whether a steering angle of the one or more steerable wheels is within a predetermined steering angle range; and when it is determined that the steering angle is within the predetermined steering angle range, output a control signal to direct the steering actuation system to automatically move the one or more steerable wheels towards a central steering angle position.

Abstract: An antenna system for a downhole tool has an antenna that is configured to operate at a plurality of frequencies. The tuning circuit is on the interior of the tool and shielded from borehole fluids. The tuning circuit is coupled to the antenna by a transformer circuit.

Abstract: An apparatus for estimating a property of an earth formation penetrated by a borehole, the apparatus having: a carrier configured to be conveyed through the borehole; a transmitter disposed at the carrier and configured to transmit electromagnetic energy at a first frequency into the formation; a first antenna disposed at the carrier and configured to receive electromagnetic signals from the formation as a result of the transmitted electromagnetic energy interacting with the formation; and an active filter coupled to the antenna and configured to filter electromagnetic signals received by the antenna to let the electromagnetic signals at the first frequency pass for processing to estimate the property.

Abstract: An antenna system for a downhole tool has an antenna that is configured to operate at a plurality of frequencies. The tuning circuit is on the interior of the tool and shielded from borehole fluids. The tuning circuit is coupled to the antenna by a transformer circuit.

Abstract: An apparatus for estimating a property of an earth formation penetrated by a borehole, the apparatus having: a carrier configured to be conveyed through the borehole; a transmitter disposed at the carrier and configured to transmit electromagnetic energy at a first frequency into the formation; a first antenna disposed at the carrier and configured to receive electromagnetic signals from the formation as a result of the transmitted electromagnetic energy interacting with the formation; and an active filter coupled to the antenna and configured to filter electromagnetic signals received by the antenna to let the electromagnetic signals at the first frequency pass for processing to estimate the property.

Abstract: A unified circuit without using a relay is proposed to resonate an antenna at more than two frequencies. The use of such analog IC switches are common place for transceiver applications in high RF frequencies (500 MHz and above). However, the use of selectively tuned antennas has for the most part been accomplished by the use of latching relays or fixed value components. The IC switch allows for not only the functionality of a single antenna to be either a transmitter and/or a receiver, but also allows, by adding additional switches to select any number of frequencies to resonate the antenna. This frequency resonation could be at fixed frequency points or sweep in either linear or logarithmic steps. The component selection of capacitors for either method would be controlled by a DSP or other microcontroller device. In one embodiment, an antenna for a downhole measurement tool is provided with a tuning circuit couple by a transformer to at least one antenna.

Abstract: A device and method employing an electrically conductive adhesive for electrically and mechanically connecting an electrical component to a board substrate. The electrical component can includes an integrated circuit and the board may include a printed circuit board. The possible adhesives include a silver conducting RTV, silver-conducting adhesive, as well as silver conducting epoxy.

Abstract: A siphon is provided that includes a conduit assembly. A suction device is connected to the conduit assembly for evacuating air from the conduit assembly, allowing a fluid to be drawn into the conduit assembly. A closure mechanism is moveable from an open position, which allows the fluid to flow therepast, to a closed position, which prevents the fluid from flowing therepast.

Abstract: This invention provides a measurement-while-drilling (MWD) downhole assembly for use in drilling boreholes which utilizes directional formation evaluation devices on a rotating assembly in conjunction with toolface orientation sensors. The data from the toolface orientation sensors are analyzed by a processor and toolface angle measurements are determined at defined intervals. Formation evaluation sensors operate substantially independently of the toolface orientation sensors and measurements of the formation evaluation sensors are analyzed in combination with the determined toolface angle to obtain formation parameters.