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Actively controlled rotary steerable system and method for drilling wells

An actively controlled rotary steerable drilling system for directional drilling of wells having a tool collar rotated by a drill string during well drilling. A bit shaft has an upper portion within the tool collar and a lower end extending from the collar and supporting a drill bit. The bit shaft is omni-directionally pivotally supported intermediate its upper and lower ends by a universal joint within the collar and is rotatably driven by the collar. To achieve controlled steering of the rotating drill bit, orientation of the bit shaft relative to the tool collar is sensed and the bit shaft is maintained geostationary and selectively axially inclined relative to the tool collar during drill string rotation by rotating it about the universal joint by an offsetting mandrel that is rotated counter to collar rotation and at the same frequency of rotation. An electric motor provides rotation to the offsetting mandrel with respect to the tool collar and is servo-controlled by signal input from position sensing elements such as magnetometers, gyroscopic sensors, and accelerometers which provide real time position signals to the motor control. In addition, when necessary, a brake is used to maintain the offsetting mandrel and the bit shaft axis geostationary. Alternatively, a turbine is connected to the offsetting mandrel to provide rotation to the offsetting mandrel with respect to the tool collar and a brake is used to servo-control the turbine by signal input from position sensors.
Owner:SCHLUMBERGER TECH CORP

Electrosurgical apparatus having digestion electrode and methods related thereto

InactiveUS6896674B1High trafficAvoid and minimize current shortingHeart valvesEndoscopesHigh frequency powerDigestion
Methods and apparatus for resecting and ablating tissue at a target site of a patient, the apparatus including a probe having an elongate shaft. The shaft includes a shaft distal end portion and a shaft proximal end portion, and a resection unit located at the shaft distal end portion. The resection unit includes a resection electrode support and at least one resection electrode arranged on the resection electrode support. The at least one resection electrode includes a resection electrode head. The probe and resection electrode head are adapted for concurrent electrical ablation and mechanical resection of target tissue. The shaft may include at least one digestion electrode capable of aggressively ablating resected tissue fragments. At least one fluid delivery port on the shaft distal end portion may provide an electrically conductive fluid to the resection unit or to the target site. The shaft may include at least one aspiration port, located proximal to the resection unit, for aspirating excess or unwanted fluids and resected tissue fragments from the target site. The at least one aspiration port is coupled to an aspiration lumen. The at least one digestion electrode may be arranged within the aspiration lumen for ablation of tissue fragments therein. In use, the digestion and resection electrodes of the probe are coupled to a high frequency power supply. A surgical kit comprising the probe is also disclosed, together with a method of making the probe.
Owner:ARTHROCARE

Method and storage and manipulation of storage system metrics

A method for storage and manipulation of storage system metrics incorporates a self-describing format wherein each data file includes a header block that contains the description and order of the periodic data. The header block is followed by a data block in which the data items are presented in the order that they appear in the data description block for that category. Two types of data are managed, including Base Metrics and Derived Metrics. Base Metrics are metrics that appear in the data file sent by an agent. Derived Metrics are computed based on a set of functions that derive new metrics from the base metrics as well as from previously defined derived metrics. A subset of the data block or file describes the configuration of the storage system at the time that the data file was created. Thus the data file contains a header section that in addition to describing the metrics also describes the configuration. A performance view component a user interface that facilitates access to the archives, and data manipulation effecting enhanced performance analysis, workload characterization and capacity planning. The performance view component facilitates generation of factory and user defined views of monitored metrics / parameters. Metrics from a storage system can be correlated using the performance view features, and parameters across machines can be correlated as well. System configuration(s) can be viewed and changed via the performance view user interface.
Owner:EMC IP HLDG CO LLC

Printer and ink cartridge attached thereto

A printer that enables required data, such as a remaining quantity of each ink, to be written securely even when a storage device having a relatively low allowable frequency of rewriting is applied for a storage element mounted on an ink cartridge. An ink cartridge that is detachably attached to the printer. In the printer, a sequential access-type EEPROM having a relatively low allowable frequency of rewriting is applied for storage elements incorporated in both a black ink cartridge and a color ink cartridge. A print controller in the printer has a memory, for which an EEPROM (or a DRAM) is applicable. Data relating to each ink cartridge, such as a remaining quantity of each ink in the ink cartridge, are stored into both the EEPROM of the print controller and a memory cell included in the storage element of the ink cartridge. The writing operation of data into the EEPROM of the print controller is carried out at every time the remaining quantity of each ink is calculated, whereas the writing operation into the memory cell in the storage element of the ink cartridge is carried out restrictedly in response to a power down instruction. This arrangement causes the frequency of writing into the storage element of the ink cartridge to be lower than the frequency of writing into the EEPROM of the print controller. This accordingly fulfills the requirements, that is, the sufficient reliability of data and the restriction of the allowable frequency of rewriting.
Owner:SEIKO EPSON CORP
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