Quotables
"The Americans have need of the telephone, but we do not. We have plenty of messenger boys."
Sir William Preece, chief engineer, British Post Office ; 1878
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 7352177 | Three-axis fluxgate-type magnetism detecting device and method A three-axis fluxgate-type circuit having three fluxgate sensors for outputting three analog voltage values respectively. A controller normalizes three digital voltage values corresponding to said three analog voltage values, select a set of linear voltage values fr... | 04/01/2008 |
| 7073269 | Self-leveling laser alignment tool and method thereof A self-leveling laser alignment tool and method thereof which provides a laser beam in a substantially truly level or plumb orientation are disclosed. Magnetic attraction is used to compensate for leveling errors of an approximately or partially leveled pendulum pla... | 07/11/2006 |
| 7065888 | Gyroscopic system for boresighting equipment A gyroscopic system for translating parallel and non-parallel lines between a reference line and a device to be aligned with respect to the reference line is provided. The system includes a first inertial sensor configured to be substantially stationary, the first i... | 06/27/2006 |
| 7051587 | Traction apparatus The present invention generally relates to a method and apparatus for performing an operation in a tubular. In one aspect, a method comprises positioning an apparatus in the tubular, the apparatus having a tractor portion and an auxiliary module. The method further ... | 05/30/2006 |
| 7028409 | Method for computation of differential azimuth from spaced-apart gravity component measurements A method is provided for computing the differential azimuth between two sets of spaced-apart gravity component measurement devices in a borehole, employing multiple rotation angles. The method includes modeling relationships of axes as defined; forming equations rel... | 04/18/2006 |
| 6937023 | Passive ranging techniques in borehole surveying A method for determining the location of a target subterranean structure from within an adjacent borehole is disclosed which uses first and second gravity measurement devices disposed at corresponding first and second positions in the adjacent borehole and a magneti... | 08/30/2005 |
| 6792382 | Spirit level A spirit level has a first inclination sensor, at least one second inclination sensor, and a display to represent an inclination for the at least one second inclination sensor based on an inclination for the first inclination sensor. The display may represent the in... | 09/14/2004 |
| 6351891 | Miniature directional indication instrument A miniature directional indication sensor system capable of operating at elevated temperature. A directional indication sensor system is less than 1 inch in diameter and 7 inches in length. The directional sensor system provides angle measurement in appli... | 03/05/2002 |
| 5174033 | Angle sensor for a steerable boring tool A roll sensor is provided for determining the roll angle of a rotatable member. The roll sensor includes a plurality of elements arranged in a predetermined manner, each element having a first state and a second state. A controller controls the respective... | 12/29/1992 |
| 4999920 | Surveying of boreholes A method of deriving the true magnitude of the terrestial magnetic field in the direction of the longitudinal axis of a borehole at a region of the borehold occupied by an instrumentation package equipped with magnetic vector measuring means for measuring... | 03/19/1991 |
| 4937518 | Electrical inclination sensor and a monitoring circuit for the sensor The sensor comprises a body defining a closed chamber which is partially filled with electrically conductive liquid. A main electrode and first and second auxiliary electrodes extend within the chamber in such a way that a variation in the inclination of ... | 06/26/1990 |
| 4761889 | Method for the detection and correction of magnetic interference in the surveying of boreholes A method is presented, for use in borehole drilling, for correcting errors in azimuth determination resulting from variations in the earth's magnetic field to which a measuring instrument is exposed. The method distinguishes between variations in the eart... | 08/09/1988 |
| 4756088 | Instruments for monitoring the direction of a borehole An instrument for monitoring the direction of a borehole comprises an elongate casing having its longitudinal axis coincident, in use, with the axis of the borehole, an outer gimbal pivotally mounted within the casing with its pivot axis coincident with t... | 07/12/1988 |
| 4709486 | Method of determining the orientation of a surveying instrument in a borehole A method of determining the orientation of a surveying instrument in a borehole from measurements of the earth's gravitational and magnetic fields wherein the azimuth angle is calculated directly without correcting an apparent azimuth. Those measurements ... | 12/01/1987 |
| 4696112 | Bore hole navigator A bore hole navigator utilizing a two axis directional gyro on the inner frame of the navigator and a single axis accelerometer on the outer frame is disclosed. This allows the inner frame of the navigator and thus the entire navigator to be smaller in di... | 09/29/1987 |
| 4672752 | Method of determining the difference in borehole azimuth at successive points A borehole survey instrument has a probe with a polarized light system for transmitting a signal representing the angular orientation of the probe to the surface. Light from a source in the probe is directed through a polarized filter with an axis of pola... | 06/16/1987 |
| 4614040 | Borehole survey system and method of determining the difference in borehole azimuth at successive points A borehole survey instrument has a probe with a polarized light system for transmitting a signal representing the angular orientation of the probe to the surface. Light from a source in the probe is directed through a polarizing filter with an axis of pol... | 09/30/1986 |
| 4611405 | High speed well surveying A borehole survey apparatus including (a) angular rate sensor means having a sensitive axis, (b) tilt sensor means, (c) a rotary drive operatively connected to said (a) and (b) sensor means to rotate same about an axis extending generally in the direction of the ... | 09/16/1986 |
| 4593559 | Apparatus and method to communicate bidirectional information in a borehole The invention relates generally to mapping or survey apparatus and methods, and more particularly concerns efficient transmission of survey signals or data from depth level in a borehole or well to the well surface, for analysis, display or recordation; f... | 06/10/1986 |
| 4524526 | Apparatus and method for inertial measurement of pipeline deflection Apparatus and a method for detecting deflections along the length of a pipeline. A plurality of measurements of inertial attitude are made along the length of the pipeline over time by means of apparatus, including sensors, associated with a pipeline pig.... | 06/25/1985 |
| 4525715 | Toroidal coupled telemetry apparatus A logging telemetering system comprising a toroidal coupled telemetry apparatus including a primary winding carrying bore hole data, wrapped around at last one torroid core mounted within a drill collar. The toroid core is further wrapped with at least on... | 06/25/1985 |
| 4493155 | Apparatus for remotely indicating angular position A sensor (16) is affixed to a piece of rotatable equipment (10). The sensor has a rolling member (26) freely moveable within a cage member (18). In operation, the rolling member (26) contacts electrically conductive surfaces (28,30) disposed about the int... | 01/15/1985 |
| 4472884 | Borehole azimuth determination using magnetic field sensor A well mapping apparatus comprises: (a) a magnetic field sensing device whose output is proportional to a local magnetic field vector, (b) an acceleration sensing device whose output is proportional to a local gravity vector, (c) the devices supported for rota... | 09/25/1984 |
| 4471533 | Well mapping system and method with sensor output compensation Bore-hole mapping, or surveying, or tool steering in a bore-hole is accomplished using selected combinations of sensors, with sensor signal compensation being provided, in the hole or at the surface. Typical sensors include an angular rate sensor or senso... | 09/18/1984 |
| 4468863 | High speed well surveying A borehole survey method employs a first sensor for measuring angular rate, and a second sensor or sensors for sensing tilt, and a rotary drive for the first and second sensors, and includes the steps: (a) operating the drive and the first and second sensors a... | 09/04/1984 |
| 4468665 | Downhole digital power amplifier for a measurements-while-drilling telemetry system A downhole digital power amplifier comprises a device which, through digital means, provides a sinusoidal, variable frequency, variable power and variably phase-shift modulated output for the transmission of data from a downhole sensor arrangement to an u... | 08/28/1984 |
| 4461088 | Survey apparatus and method employing canted tilt sensor A borehole mapping and/or navigational instrument includes a carrier movable lengthwise in the borehole; structure on the carrier defining an axis of rotation; and a tilt sensitive device rotatable about the axis of rotation, that device having a tilt sen... | 07/24/1984 |
| 4459760 | Apparatus and method to communicate information in a borehole The invention concerns efficient transmission of borehole survey signals or data from depth level in a borehole or well to the well surface, for analysis, display or recordation; further it concerns supply of DC power downwardly to the instrumentation via... | 07/17/1984 |
| 4459759 | Angular rate and position transducer for borehole survey instrument A transducer for sensing the angular position or rate of change of displacement of a housing of a borehole survey instrument with respect to a reference position includes a rotor magnetically suspended within a stator which is in turn secured to the housi... | 07/17/1984 |
| 4457077 | Borehole gradiometer An apparatus and its use for measuring the differences in gravity at spaced locations in a wellbore. The apparatus includes first and second gravity measuring devices mounted at spaced vertical positions from each other and encapsulated for movement throu... | 07/03/1984 |
| 4452075 | Push drill guidance indication apparatus The present invention relates to a program controlled apparatus for providing rapid calibration and update of sensor parameters in a push drill guidance apparatus which is remotely controllable from microprocessor circuitry. A special calibration program ... | 06/05/1984 |
| 4437243 | Gyroscopic instrument An instrument including a gyroscopic rotor mounted to precess about a predetermined axis in response to pivotal movement of the rotor about a sensing axis, with the rate of precession being measured and being utilized to determine the amount of said pivot... | 03/20/1984 |
| 4428125 | Inclination indicating apparatus A conventional mining bore hole drill assembly having a drill mounted on a boom wherein the orientation of the drill and boom with respect to the mined material is readily adjustable. First and second inclination detectors are mounted on the boom with eac... | 01/31/1984 |
| 4393598 | Borehole tool A surface activated multishot survey tool utilizes a dampened magnetic compass movably positioned within a probe to determine the direction of a borehole. Lamps in the probe are operable to light the face of the compass. A lens projects the image of the c... | 07/19/1983 |
| 4381610 | Self-contained downhole compass A self-contained compass apparatus includes a sensing circuit and power source which are enclosed along with a compass unit within a chamber which is adaptable for suspension at extended distances into a borehole, such as, an oil well, so as to assist in ... | 05/03/1983 |
| 4361192 | Borehole survey method and apparatus for drilling substantially horizontal boreholes A borehole survey method and apparatus for use in drilling substantially horizontal boreholes through a mineral deposit wherein a dip accelerometer, a roll accelerometer assembly and a fluxgate are disposed near the drill bit, which is mounted on a bent s... | 11/30/1982 |
| 4344235 | Levitated ball inclinometer The circuitry and structure of a levitated ball inclinometer are disclosed. A ferromagnetic ball is centerized between pairs of electromagnets by electromagnetic forces of magnitudes sufficient to offset the gravitational forces imposed on the ball. The e... | 08/17/1982 |
| 4335520 | Survey spar system for precision offshore seafloor surveys A stiff, straight spar is allowed to pivot about an anchor on the seafloor. he location of the bottom with respect to the top is then determined by measuring the tilt of the spar and computing the offset of the bottom relative to the top. The straight memb... | 06/22/1982 |
| 4302886 | Gyroscopic directional surveying instrument Apparatus used for the directional surveying of deep wells, i.e., 20,000-25,000 feet (6,096 meters-7,620 meters), and which is specifically identified as a gyroscopic directional surveying instrument having a high pressure and a high temperature capabilit... | 12/01/1981 |
| 4293815 | Fluxgate magnetometer circuit with earth's field elimination A flux gate magnetometer system utilizes three independent flux gates for measuring the three mutually orthogonal components of the earth's magnetic field. A sensor for each flux gate includes a ring core with a toroidal winding as the drive winding and a... | 10/06/1981 |
