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| Number | Title | Issue Date |
| 6874353 | Yield point adaptation for rotating viscometers A conventional Couette viscometer is transformed to measure yield point, also known as yield stress, and other rheology of various fluids, including ones with particulates. A rotating viscometer includes a driven portion, a responsive body, a standard spring, and a ... | 04/05/2005 |
| 6782735 | Testing device and method for viscosified fluid containing particulate material A device and a method for testing a viscosified fluid containing particulate indicate when the particulate is in suspension within the fluid and when it is not. The device and method stir the fluid and particulate mixture for a time during which the viscosity of the... | 08/31/2004 |
| 5043949 | Data signal transmission cable and method A data signal transmission cable particularly adapted for use in seismic prospecting permits high speed digital data transmission. In a preferred embodiment, the cable includes a transceiver at each end and two repeaters located near the center of the cab... | 08/27/1991 |
| 4905281 | Security apparatus and method for computers connected to telephone circuits A security apparatus for interfacing a computer system with a telephone circuit includes a modem and a controller interfacing between the telephone circuit and a modem of the computer system. The first-mentioned modem and the controller operate to answer ... | 02/27/1990 |
| 4903765 | Delayed opening fluid sampler A delayed opening fluid sampling tool comprises a body having three chambers and a port defined therein. The tool also comprises a metering device which is disposed in the body between two of the chambers, one of which chambers is for holding a metering f... | 02/27/1990 |
| 4869299 | Radioactivity shielding transportation assembly and method A method of transferring radioactive substance wherein a radioactivity shielding assembly, suitable for transferring a radioactive substance with a reduced risk of human exposure and environmental contamination, includes a protective shield casing having ... | 09/26/1989 |
| 4850750 | Integrated blending control system An integrated control system, specifically transportable on water between offshore wells, includes mixing and blending subsystems, a pumping subsystem, a proppant subsystem and a control subsystem for controlling the other subsystems in a unified manner f... | 07/25/1989 |
| 4846235 | Radioactivity shielding transportation assembly A radioactivity shielding assembly, suitable for transferring a radioactive substance with a reduced risk of human exposure and environmental contamination, includes a protective shield casing having a reservoir disposed in the casing for receiving the ra... | 07/11/1989 |
| 4829811 | Fluid testing apparatus and method A fluid testing apparatus comprises a container for holding a fluid to be tested and a member disposed within the container so that the member is rotatable within a fluid to be tested within the container. The container has a wall defining a cavity into w... | 05/16/1989 |
| 4827438 | Method and apparatus related to simulating train responses to actual train operating data A system includes an interface through which actual train operating data can be transferred from a recording medium, such as a magnetic tape, into a train simulator. The date contents of the magnetic tape are generated from real-time data obtained on-boar... | 05/02/1989 |
| 4817437 | Pressure communicating, fluid isolating interface A housing which is connectible to a pressure sensitive tool has a filter cartridge mounted within it to communicate a pressure from an external fluid to a clean fluid contained within the filter cartridge and the tool. The filter cartridge includes one or... | 04/04/1989 |
| 4805407 | Thermomechanical electrical generator/power supply for a downhole tool A downhole tool for an oil or gas well includes a self-contained power supply having a housing in which a primary fuel source, a Stirling cycle engine, and a linear alternator are disposed. The primary fuel source includes a radioisotope which, by its rad... | 02/21/1989 |
| 4802370 | Transducer and sensor apparatus and method A sensor apparatus includes a pressure sensor, a reference device and a temperature sensor collocated within a common environment. The reference device and the temperature sensor are constructed to have temperature response times matched to the temperatur... | 02/07/1989 |
| 4800958 | Annulus pressure operated vent assembly A vent subassembly includes a vent body having an opening which is covered or uncovered dependent upon the location of a vent sleeve relative to the vent body. The vent subassembly can be connected below a packer, and the vent sleeve can be connected to a... | 01/31/1989 |
| 4802141 | Self-leveling mixer with mechanical agitation A self-leveling mixer apparatus includes a base and a generally downwardly tapered movable mixing tub supported from the base in a manner such that the tub is movable between first and second positions relative to the base. A leveling valve is provided fo... | 01/31/1989 |
| 4794548 | Data collection apparatus and train monitoring system An apparatus for monitoring the operation of a railroad train includes two on-board units which collect and utilize data for ultimate transfer to a portable unit which can be carried onto and off of the railroad train. One of these on-board units operates... | 12/27/1988 |
| 4791952 | Hydrant and components thereof A hydrant includes one or more novel and improved features, namely: (1) a nozzle assembly comprising a nozzle and a retainer ring mounted from within the upper standpipe section of the hydrant; (2) an operating assembly defining an excess reservoir volume... | 12/20/1988 |
| 4790341 | Hydrant and components thereof A hydrant includes one or more novel and improved features, namely: (1) a nozzle assembly comprising a nozzle and a retainer ring mounted from within the upper standpipe section of the hydrant; (2) an operating assembly defining an excess reservoir volume... | 12/13/1988 |
| 4786805 | Reusable radioactive material shipping container including cartridge and injector A container for holding a radioactive substance to be injected directly into a flow stream includes a cartridge portion, defined by a receptacle member having a cavity in which the substance is to be carried and a channel through which the substance is to... | 11/22/1988 |
| 4782694 | Pressure communicating, fluid isolating interface A housing which is connectible to a pressure sensitive tool has a filter cartridge mounted within it to communicate a pressure from an external fluid to a clean fluid contained within the filter cartridge and the tool. The filter cartridge includes one or... | 11/08/1988 |
| 4779186 | Automatic density control system for blending operation A control system is provided which can be retrofit to existing conventional blender devices, such as a blender trailer used for combining a pregelled liquid with a solid particulate additive at a well site. The control is provided either manually or autom... | 10/18/1988 |
| 4773299 | Well perforating apparatus and method A perforating gun is designed to have explosive charges spirally disposed around its circumference in accordance with a displacement angle defined as (m/p) (360°), where p is a whole number greater than 4 and m is a whole number greater than 1 but less t... | 09/27/1988 |
| 4770203 | Hydrant and components thereof A hydrant includes one or more novel and improved features, namely: (1) a nozzle assembly comprising a nozzle and a retainer ring mounted from within the upper standpipe section of the hydrant; (2) an operating assembly defining an excess reservoir volume... | 09/13/1988 |
| 4770954 | Switching power supply and method A power supply has two energy sources, one of which has a relatively low energy density but provides a relatively high current and the other of which has a relatively high energy density but provides a relatively low current. One end of each of the energy... | 09/13/1988 |
| 4767603 | Pig for a fluid conducting system A pig for a fluid conducting system includes a support member, a first rim extending substantially longitudinally from an end of the support member, and a second rim extending substantially longitudinally from an opposite end of the support member. In a p... | 08/30/1988 |
| 4763686 | Hydrant and components thereof A hydrant includes one or more novel and improved features, namely: (1) a nozzle assembly comprising a nozzle and a retainer ring mounted within the upper standpipe section of the hydrant; (2) an operating assembly defining an excess reservoir volume to r... | 08/16/1988 |
| 4762179 | Pressure assist detonating bar and method for a tubing conveyed perforator A detonator bar has an outer housing, an inner housing connected to the outer housing by at least one first frangible member, an explosive charge disposed in the inner housing, and a firing piston with firing pin held in the inner housing by at least one ... | 08/09/1988 |
| 4760884 | Air chamber actuated dual tubing release assembly An apparatus and method of operation for the release of concentric tubing strings used in well operations. In the preferred embodiment, the apparatus includes a tubing release assembly and an air chamber assembly as an actuating tool. The tubing release a... | 08/02/1988 |
| 4751648 | Local area network data transfer system A data monitoring system includes a display unit for communicating with an operation that has characteristics which are to be monitored, a recording unit located remotely from the environment of the monitored operation, and a local area network interconne... | 06/14/1988 |
| 4747060 | Data acquisition module and method A data acquisition apparatus includes two microcomputers interconnected by a shared dual access digital storage device. One microcomputer obtains the data related to the monitored condition, stores it in the digital storage device, and modifies a status w... | 05/24/1988 |
| 4741085 | Repair of railway cushioning apparatus A cushioning apparatus for a railway car includes a housing having a cylinder bore disposed therein with an end plate closing one end of the cylinder bore. A piston assembly includes a shaft extending through the end plate and a piston disposed on the sha... | 05/03/1988 |
| 4731531 | Method of logging a well using a non-radioactive material irradiated into an isotope exhibiting a detectable characteristic A method of logging a well includes the steps of moving a tagging agent into a well so that the tagging agent is deposited in an earthen formation of the well, which tagging agent is non-radioactive at least until just prior to entering the well; irradiat... | 03/15/1988 |
| 4718027 | Dynamically adjustable linear data discriminator A method of discriminating between linear and nonlinear regions of measured data is based upon two hypotheses, one of which is a hypothesis that a response is merely a result of inherent randomness and the other of which is a hypothesis that the response ... | 01/05/1988 |
| 4717867 | Apparatus for conserving power in operating a load A load, such as a control circuit for a DC/DC converter, is initially operated by an initial load powering voltage developed by a power consuming regulator until another voltage, such as the DC/DC converter's output voltage derived from an input voltage u... | 01/05/1988 |
| 4709234 | Power-conserving self-contained downhole gauge system The power-conversing apparatus includes a plurality of independently energizable electrical circuits used in receiving electrical signals from a transducer which senses an environmental condition, in processing the electrical signals, and in storing infor... | 11/24/1987 |
| 4700567 | Rheology test system A rheology test system includes a self-propelled vehicle, a computer contained in the vehicle and a rheology flow loop skid mounted in an outboard storage compartment of the vehicle. The rheology flow loop skid includes an obliquely mounted helical condui... | 10/20/1987 |
| 4691558 | Pressure pulse gelation test apparatus and method The gelation testing apparatus includes a closed fluid circuit in which a sample of the substance to be tested is contained. A pressurizing device, such as a pump, is connected into the closed fluid circuit so that the pressure within the closed circuit c... | 09/08/1987 |
| 4689744 | Control method for a recording device A preferred embodiment of a method for developing a single set of time intervals for controlling a memory device effectively utilizes a histograph having two parallel time lines with the same scale. One time line has a series of minimum time periods, each... | 08/25/1987 |
| 4682506 | Automatic material sampler An automatic material sampling apparatus includes a housing for receiving a positively or negatively pressurized flow of material to be sampled as the material flows through a conduit, wherein the housing is disposed in-line with the conduit. The apparatu... | 07/28/1987 |
| 4675649 | Apparatus and method for interfacing a transducer An analog-to-digital conversion technique utilizes an oscillator which provides a primary oscillating signal that drives a counter and that generates a derived signal having a frequency less than the primary signal. The derived signal is integrated for us... | 06/23/1987 |
