| Patent | 
	  	 Priority | 
	  	 Assignee | 
	  	 Title | 
	  
	      
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	  | 
	  | 
	  | 
	 
    
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	 Mar 28 1975 | 
	  | 
	 Accelerometer telemetry system | 
	 
    
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	 Jul 22 1974 | 
	 SmithKline Beckman Corporation | 
	 Load signaling device for a patient's foot | 
	 
    
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	 Nov 03 1972 | 
	 SCHONSTEDT INSTRUMENT COMPANY LLC | 
	 Apparatus and method employing foam sleeves for supporting magnetic sensors in a tubular housing | 
	 
    
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	 Jul 31 1980 | 
	 Metrotech, Inc. | 
	 Apparatus for determining the distance to a concealed conductive object which is radiating an alternating current signal | 
	 
    
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	 Jun 24 1980 | 
	 Schonstedt Instrument Company | 
	 Multiaxis magnetometer apparatus with orthogonally disposed rectangular housings for mounting separate sensor assemblies | 
	 
    
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	 Jul 31 1980 | 
	 Metrotech, Inc. | 
	 Apparatus including a pair of automatic gain controlled amplifiers for determining the lateral direction to a concealed conductive object | 
	 
    
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	 Aug 10 1982 | 
	 Schonstedt Instrument Company | 
	 Magnetic detector instrument with board-mounted sensor assembly | 
	 
    
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	 Jun 23 1982 | 
	 Schonstedt Instrument Company | 
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	 Jun 23 1982 | 
	 Schonstedt Instrument Company | 
	 Magnetic detector apparatus with excitation conductors connected in series via sensor housing | 
	 
    
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	 Apr 11 1983 | 
	 Schonstedt Instrument Company | 
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	 May 29 1986 | 
	 Minnesota Mining and Manufacturing Company | 
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	 Dec 01 1986 | 
	 Schonstedt Instrument Company | 
	 Manufacture of magnetic cores from blanks of magnetically permeable sheet material | 
	 
    
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	 Aug 01 1986 | 
	 SCHONSTEDT INSTRUMENT COMPANY LLC | 
	 Method of making magnetic cores | 
	 
    
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	 May 06 1987 | 
	 Schonstedt Instrument Company | 
	 Magnetic locating and tracing system and method using dual-antenna transmitter to distinguish between concealed adjacent objects | 
	 
    
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	 Dec 01 1986 | 
	 Schonstedt Instrument Company | 
	 Magnetic core blanks of magnetically permeable sheet material | 
	 
    
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	 Aug 01 1986 | 
	 SCHONSTEDT INSTRUMENT COMPANY LLC | 
	 Magnetic cores | 
	 
    
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	 Nov 18 1986 | 
	 Minnesota Mining and Manufacturing Company | 
	 Marker for locating a buried object | 
	 
    
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	 Jun 05 1989 | 
	 Heath Consultants, Inc. | 
	 Apparatus for locating concealed electrical conductors | 
	 
    
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	 Mar 15 1989 | 
	 SCHONSTEDT INSTRUMENT COMPANY LLC | 
	 Methods and apparatus employing permanent magnets for marking, locating, tracing and identifying hidden objects such as burried fiber optic cables | 
	 
    
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	 Jun 28 1988 | 
	 Radiodetection Limited | 
	 System for detecting the location and orientation of a temporarily inaccessible object | 
	 
    
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	 Oct 30 1989 | 
	 SCHONSTEDT INSTRUMENT COMPANY LLC | 
	 Methods and apparatus employing permanent magnets for marking, locating, tracing and identifying hidden objects such as buried fiber optic cables | 
	 
    
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	 Oct 14 1988 | 
	 WASHINGTON GROUP INTERNATIONAL, INC , AN OHIO CORPORATION | 
	 Site survey method and apparatus | 
	 
    
	 | 5043666,  | 
	 Apr 16 1990 | 
	 Metrotech Corporation | 
	 Self-calibrating electromagnetic field sensor for locating buried conduits | 
	 
    
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	 Sep 18 1989 | 
	 Minnesota Mining and Manufacturing Company | 
	 Self-dispensing spaced electronic markers | 
	 
    
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	 Jun 18 1990 | 
	 CHARLES MACHINE WORKS, INC , THE | 
	 System for locating concealed underground objects using digital filtering | 
	 
    
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	 Mar 17 1989 | 
	 Minnesota Mining and Manufacturing Company | 
	 Method and apparatus for determining direction to and position of an underground conductor | 
	 
    
	 | 5097211,  | 
	 May 25 1990 | 
	 SCHONSTEDT INSTRUMENT COMPANY LLC | 
	 Magnetic detection appartaus with plastic housing and sound-transmissive handle | 
	 
    
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	 Mar 15 1989 | 
	 SCHONSTEDT INSTRUMENT COMPANY LLC | 
	 Methods, apparatus and devices relating to magnetic markers for elongated hidden objects | 
	 
    
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	 Mar 15 1989 | 
	 SCHONSTEDT INSTRUMENT COMPANY LLC | 
	 Methods employing permanent magnets for marking, locating, tracing and identifying hidden objects such as buried fiber optic cables | 
	 
    
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	 May 25 1990 | 
	 SCHONSTEDT INSTRUMENT COMPANY LLC | 
	 Magnetic detection apparatus with sensors mounted on channel or angle cantilever support | 
	 
    
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	 May 25 1990 | 
	 SCHONSTEDT INSTRUMENT COMPANY LLC | 
	 Method of manufacturing magnetic detection apparatus | 
	 
    
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	 Mar 15 1989 | 
	 SCHONSTEDT INSTRUMENT COMPANY LLC | 
	 Method for providing magnetic markers on elongated hidden objects | 
	 
    
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	 Mar 15 1989 | 
	 SCHONSTEDT INSTRUMENT COMPANY LLC | 
	 Methods, apparatus and devices relating to magnetic markers for elongated hidden objects | 
	 
    
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	 Aug 07 1990 | 
	 MICHAEL BAKER JR , INC  | 
	 Interactive automated mapping system | 
	 
    
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	 Jun 18 1990 | 
	 CHARLES MACHINE WORKS, INC , THE | 
	 Locator transmitter having an automatically tuned antenna | 
	 
    
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	 Mar 25 1992 | 
	 SCHONSTEDT INSTRUMENT COMPANY LLC | 
	 Magnetic cores for saturable core measuring devices and methods of manufacturing such cores | 
	 
    
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	 Feb 13 1989 | 
	 Radiodetection Limited | 
	 Method and apparatus for tracing conductors using an alternating signal having two components related in frequency and phase | 
	 
    
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	 Jun 18 1990 | 
	 The Charles Machine Works, Inc.; CHARLES MACHINE WORKS, INC , THE | 
	 System transmitting and receiving digital and analog information for use in locating concealed conductors | 
	 
    
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	 Jun 18 1990 | 
	 The Charles Machine Works, Inc. | 
	 System for locating multiple concealed underground objects | 
	 
    
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	 Sep 29 1992 | 
	 Minnesota Mining and Manufacturing Company | 
	 Sensor array for circuit tracer | 
	 
    
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	 Oct 08 1992 | 
	 Alcatel Espace | 
	 Method of estimating the error in the calculation of the position of a mobile by a GPS receiver, and GPS receiver for implementing this method | 
	 
    
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	 Aug 27 1993 | 
	 Minnesota Mining and Manufacturing Company | 
	 Conductor locator adapter for electronic markers | 
	 
    
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	 Sep 29 1992 | 
	 Minnesota Mining and Manufacturing Company | 
	 Circuit tracer having an electric field sensor, a differential electric field sensor and an inductive sensor | 
	 
    
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	 Jan 29 1993 | 
	 Minnesota Mining and Manufacturing Co.; Minnesota Mining and Manufacturing | 
	 Apparatus for locating buried conductors using phase-shifted signals | 
	 
    
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	 Sep 29 1992 | 
	 Minnesota Mining and Manufacturing Company | 
	 Sensor for circuit tracer | 
	 
    
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	 Jun 29 1994 | 
	 Minnesota Mining and Manufacturing Company | 
	 Sonde with replaceable electronics and a rotatable, tubular inner shell wherein a battery is located | 
	 
    
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	 May 18 1993 | 
	 Goldstar Co., Ltd. | 
	 Apparatus for and method of reproducing digital video signals at a varied speed | 
	 
    
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	 Apr 18 1994 | 
	 Radiodetection Limited | 
	 Apparatus and method for obtaining geographical positional data for an object located underground | 
	 
    
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	 May 16 1995 | 
	 The Charles Machine Works, Inc. | 
	 Avoiding ghosting artifacts during surface location of subsurface transmitters | 
	 
    
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	 Jul 12 1994 | 
	 Leidos, Inc | 
	 Apparatus and method for measuring buried ferromagnetic objects with a high accuracy of position and in synchronization with a sync pulse provided by a global positioning system | 
	 
    
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	 Sep 27 1995 | 
	 AT&T | 
	 Method and apparatus for precisely locating a buried utility conveyance | 
	 
    
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	 Mar 04 1993 | 
	 Trimble Navigation Limited | 
	 Location and generation of high accuracy survey control marks using satellites | 
	 
    
	 | 5751289,  | 
	 Oct 01 1992 | 
	 University Corporation for Atmospheric Research | 
	 Virtual reality imaging system with image replay | 
	 
    
	 | 5764127,  | 
	 Mar 17 1995 | 
	 Radiodetection Limited | 
	 Inductive transmitters for conductor location | 
	 
    
	 | 5769370,  | 
	 Dec 29 1995 | 
	 TOPCON POSITION SYSTEMS, INC ; Topcon GPS LLC | 
	 Knock-down satellite positioning system antenna supporting tripod | 
	 
    
	 | 5828219,  | 
	 Aug 22 1996 | 
	 Radiodetection, Ltd. | 
	 Method of detecting faults in the insulation layer of an insulated concealed conductor | 
	 
    
	 | 5916300,  | 
	 Jul 18 1997 | 
	 Trimble Navigation Limited | 
	 Automatic event recognition to trigger recording changes | 
	 
    
	 | 5917325,  | 
	 Mar 21 1995 | 
	 Radiodetection Limited | 
	 Method for locating an inaccessible object having a magnetic field generating solenoid | 
	 
    
	 | 5920194,  | 
	 May 06 1994 | 
	 Radiodetection Limited | 
	 Device for locating objects that emit electromagnetic signals | 
	 
    
	 | 5955667,  | 
	 Oct 11 1996 | 
	 Garmin Ltd | 
	 Motion analysis system | 
	 
    
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	 Apr 04 1997 | 
	 Qsine Corporation Limited | 
	 Multisensor vehicle-mounted mine detector | 
	 
    
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	 Nov 13 1997 | 
	 PEETERS, JOHN P  | 
	 Worker-specific exposure monitor and method for surveillance of workers | 
	 
    
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	 Apr 29 1994 | 
	 Advantedge Systems Inc.; Advantedge Systems Inc | 
	 Biofeedback system for sensing body motion and flexure | 
	 
    
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	 Aug 18 1997 | 
	 Trimble Navigation Limited | 
	 Receiver with seamless correction capacity | 
	 
    
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	 Feb 22 1999 | 
	 Trimble Navigation Limited | 
	 Global positioning system controlled paint sprayer | 
	 
    
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	 Oct 08 1997 | 
	 Radiodetection Limited | 
	 Locating an inaccessible object by detecting horizontal and vertical components of a magnetic field | 
	 
    
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	 Jul 22 1994 | 
	 Radiodetection Limited | 
	 Method of identifying a buried cable by applying a low frequency signal to the cable and detecting the resultant field | 
	 
    
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	 Aug 19 1998 | 
	 Metrotech Corporation | 
	 Automatic gain control for a line locator | 
	 
    
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	 May 26 1998 | 
	 Heath Consultants, Inc. | 
	 Continuous-depth-indicating underground pipe and cable locator | 
	 
    
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	 Apr 09 1999 | 
	 Mitsubishi Electric & Electronics USA, Inc | 
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	 Aug 01 1997 | 
	 Intel Corporation | 
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	 Mar 03 1998 | 
	 CASCADE ENGINEERING, INC  | 
	 RF embedded identification device | 
	 
    
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	 Oct 13 1999 | 
	 X-Pert Paint Mixing Systems, Inc.; X-PERT PAINT MIXING SYSTEMS, INC  | 
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	 Mar 07 1997 | 
	 Radiodetection Limited | 
	 Locator of electrically conductive objects | 
	 
    
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	 Jul 16 1997 | 
	 Radiodetection Limited | 
	 Locating concealed conductors | 
	 
    
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	 Feb 22 1999 | 
	 Trimble Navigation Limited | 
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	 Mar 03 1998 | 
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	 May 26 2000 | 
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	 Oct 28 1999 | 
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	 Apr 11 2000 | 
	 FCA US LLC | 
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	 STANLEY WORKS, THE | 
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	 ASSA ABLOY AB | 
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	 Trimble Navigation Limited | 
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	 Radiodetection Limited | 
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