Did You Know...
...that power steering was invented by independent inventor Francis W. Davis? As chief engineer in the 1920s of the truck division of the Pierce Arrow Motor Car Company, he saw how hard it was to steer heavy vehicles. So that he would be able to keep the profits from his future invention, Davis left his job, rented a small engineering shop in Waltham, Mass., and developed a hydraulic power steering system that led to power steering.
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| Number | Title | Issue Date |
| 6618951 | Orientation sensor utilizing intra-pattern property measurements An orientation sensor capable of generating at least one output signal indicative of a particular orientation parameter is described. The orientation sensor comprises a sensor housing defining a closed internal chamber including a first internal surface. ... | 09/16/2003 |
| 6559646 | Boring tool locating using sensing at spaced apart reference path locations Establishing a location of at least a portion of a particular path taken by a boring tool uses a portable locator and information generating arrangement for generating a set of positional information characterizing a position of the boring tool relative t... | 05/06/2003 |
| 6536538 | Establishing positions of locating field detectors and path mapping in underground boring tool applications Specific apparatus and associated methods are described for use in establishing the positions of locating field detectors and for path mapping within a region for the purpose of tracking and/or guiding the movement of an underground boring tool. In one as... | 03/25/2003 |
| 6530155 | Orientation sensor utilizing intra-pattern property measurements An orientation sensor capable of generating at least one output signal indicative of a particular orientation parameter is described. The orientation sensor comprises a sensor housing defining a closed internal chamber including a first internal surface. ... | 03/11/2003 |
| 6525538 | Position and orientation locator/monitor An above-ground portable locator is described for locating a boring tool positioned underground. The boring tool includes a transmitter arrangement which transmits an electromagnetic dipole orientation signal. The locator includes a receiver arrangement i... | 02/25/2003 |
| 6496008 | Flux plane locating in an underground drilling system A locator is described for tracking the position of a boring tool and/or one or more buried lines within a region. A flux plane is used to establish a flux vector to guide the portable locator to locate points in a dipole field. A locate line is located i... | 12/17/2002 |
| 6457537 | Mapping tool for tracking and/or guiding an underground boring tool A portable mapping tool for use in a horizontal drilling system and associated methods use a boring tool configured for transmitting a locating signal. The mapping tool also includes at least one electromagnetic field detector which is configured for meas... | 10/01/2002 |
| 6454023 | Mapping tool for tracking and/or guiding an underground boring tool Systems and associated methods for tracking and/or guiding an underground boring tool use one or more detectors to measure the intensity of an electromagnetic field which is transmitted from an underground boring tool. The measured intensities may then be... | 09/24/2002 |
| 6400159 | Orientation sensor especially suitable for use in an underground boring device An orientation sensor especially suitable for use in an underground device is disclosed herein. This orientation sensor includes a sensor housing defining a closed internal chamber, an arrangement of electrically conductive members in a predetermined posi... | 06/04/2002 |
| 6396275 | Arrangement using measured pitch and locating field measurements to determine a positional relationship An arrangement is described in which a boring tool is moved through the ground within a given region along a particular path in an orientation which includes pitch while transmitting a locating signal. A portable locator measures signal strength at an abo... | 05/28/2002 |
| 6364035 | Establishing positions of locating field detectors and path mapping in underground boring tool applications Specific apparatus and associated methods are described for use in establishing the positions of locating field detectors and for path mapping within a region for the purpose of tracking and/or guiding the movement of an underground boring tool. In one as... | 04/02/2002 |
| 6351892 | Orientation sensor utilizing intra-pattern property measurements An orientation sensor capable of generating at least one output signal indicative of a particular orientation parameter is described. The orientation sensor comprises a sensor housing defining a closed internal chamber including a first internal surface. ... | 03/05/2002 |
| 6285190 | Skin depth compensation in underground boring applications Arrangements, specific apparatus and associated methods for skin depth compensation in underground boring applications are described. Compensation for skin depth error is accomplished by measuring a locating signal transmitted from a boring tool such that... | 09/04/2001 |
| 6250402 | Establishing positions of locating field detectors and path mappings in underground boring tool applications Specific apparatus and associated methods are described for use in establishing the positions of locating field detectors and for path mapping within a region for the purpose of tracking and/or guiding the movement of an underground boring tool. In one as... | 06/26/2001 |
| 6232780 | Underground locating using a locating signal transmitter configured with a single antenna The present invention provides a locator/monitor capable of locating a boring tool and monitoring the progress of the tool for control purposes. The locator/monitor may be used in expedited locating methodology and straightforward calibration techniques o... | 05/15/2001 |
| 6160401 | Boring technique using locate point measurements for boring tool depth prediction A system in which a boring tool is moved through the ground within a given region along a particular path in an orientation which includes pitch. A locating signal is transmitted from the boring tool which signal exhibits a field defined forward point wit... | 12/12/2000 |
| 6095260 | System, arrangements and associated methods for tracking and/or guiding an underground boring tool Systems and associated methods for tracking and/or guiding an underground boring tool are disclosed. Each system or arrangement uses one or more detectors to measure the intensity of an electromagnetic field which is transmitted from an underground boring... | 08/01/2000 |
| 6079506 | Boring tool control using remote locator A locator/control arrangement forms part of a drilling apparatus which also includes a boring tool that emits a locating signal. The locator/control arrangement is used for locating and controlling underground movement of a boring tool which is operated f... | 06/27/2000 |
| 6057687 | Two mode boring tool guiding system and method A boring tool contains an arrangement for producing a dipole magnetic field. The boring tool is steered through the ground using a boring machine. The position of the boring tool, during its movement through the ground, is established by an above ground r... | 05/02/2000 |
| 6047783 | Systems, arrangements and associated methods for tracking and/or guiding an underground boring tool Systems and associated methods for tracking and/or guiding an underground boring tool are disclosed. Each system or arrangement uses one or more detectors to measure the intensity of an electromagnetic field which is transmitted from an underground boring... | 04/11/2000 |
| 6035951 | System for tracking and/or guiding an underground boring tool Systems and associated methods for tracking and/or guiding an underground boring tool are disclosed. Each system or arrangement uses one or more detectors to measure the intensity of an electromagnetic field which is transmitted from an underground boring... | 03/14/2000 |
| 6014026 | Boring technique for using locate point measurements for boring tool depth prediction A method is disclosed as part of an overall process in which a boring tool is moved through the ground within a given region along a particular path in an orientation which includes pitch. A locating signal is transmitted from the boring tool which signal... | 01/11/2000 |
| 6005532 | Orthogonal antenna arrangement and method An antenna member, associated orthogonal antenna arrangement and method are disclosed. The antenna member is configured such that an orthogonal antenna arrangement may utilize two or three identical ones of the disclosed antenna member. Accordingly, the a... | 12/21/1999 |
| 5990683 | Method and arrangement for locating a boring tool using a three-antennae vector sum The present invention provides a locator/monitor capable of locating a boring tool and monitoring the progress of the tool for control purposes. The locator/monitor may be used in expedited locating methodology and straightforward calibration techniques o... | 11/23/1999 |
| 5878824 | Boring tool or other device including thermal protection for an electronic component assembly and method An arrangement and associated method for thermally protecting an electronic component assembly from heat at least to a limited extent is disclosed herein. The electronic component assembly includes a plurality of thermally sensitive electronic devices, ea... | 03/09/1999 |
| 5764062 | Technique for establishing and recording a boring tool path using a survey reference level An overall process in which a boring tool is moved through the ground within a given region along a particular path from a specific starting point is disclosed herein. A method of establishing and graphically recording the location of at least a portion o... | 06/09/1998 |
| 5698981 | Technique for establishing at least a portion of an underground path of a boring tool A method of establishing the location of at least a portion of a particular path taken by a boring tool within a given region is presented. The method includes the steps of establishing a reference path within the region and providing a portable locator a... | 12/16/1997 |
| 5444382 | Position and orientation locator/monitor The present invention provides a locator/monitor capable of locating a boring tool and monitoring the progress of the tool for control purposes. The locator/monitor may be used in expedited locating methodology and straightforward calibration techniques o... | 08/22/1995 |
