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Priority |
Assignee |
Title |
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Jul 22 1974 |
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Nov 03 1972 |
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Jul 31 1980 |
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Jun 24 1980 |
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Jul 31 1980 |
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Aug 10 1982 |
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4539522, |
Jun 23 1982 |
Schonstedt Instrument Company |
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4590425, |
Jun 23 1982 |
Schonstedt Instrument Company |
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Apr 11 1983 |
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May 29 1986 |
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Dec 01 1986 |
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Aug 01 1986 |
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May 06 1987 |
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Dec 01 1986 |
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Aug 01 1986 |
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Nov 18 1986 |
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Oct 30 1989 |
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Oct 14 1988 |
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Apr 16 1990 |
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Mar 17 1989 |
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5097211, |
May 25 1990 |
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Magnetic detection appartaus with plastic housing and sound-transmissive handle |
5114517, |
Mar 15 1989 |
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5122750, |
Mar 15 1989 |
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5136245, |
May 25 1990 |
SCHONSTEDT INSTRUMENT COMPANY LLC |
Magnetic detection apparatus with sensors mounted on channel or angle cantilever support |
5138761, |
May 25 1990 |
SCHONSTEDT INSTRUMENT COMPANY LLC |
Method of manufacturing magnetic detection apparatus |
5173139, |
Mar 15 1989 |
SCHONSTEDT INSTRUMENT COMPANY LLC |
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5206065, |
Mar 15 1989 |
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Methods, apparatus and devices relating to magnetic markers for elongated hidden objects |
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Aug 07 1990 |
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Interactive automated mapping system |
5231355, |
Jun 18 1990 |
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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 |
5260659, |
Feb 13 1989 |
Radiodetection Limited |
Method and apparatus for tracing conductors using an alternating signal having two components related in frequency and phase |
5264795, |
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 |
5361029, |
Jun 18 1990 |
The Charles Machine Works, Inc. |
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Sep 29 1992 |
Minnesota Mining and Manufacturing Company |
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5373298, |
Oct 08 1992 |
Alcatel Espace |
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Aug 27 1993 |
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Sep 29 1992 |
Minnesota Mining and Manufacturing Company |
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Jan 29 1993 |
Minnesota Mining and Manufacturing Co.; Minnesota Mining and Manufacturing |
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Sep 29 1992 |
Minnesota Mining and Manufacturing Company |
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5530357, |
Jun 29 1994 |
Minnesota Mining and Manufacturing Company |
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May 18 1993 |
Goldstar Co., Ltd. |
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5576973, |
Apr 18 1994 |
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5621325, |
May 16 1995 |
The Charles Machine Works, Inc. |
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5629626, |
Jul 12 1994 |
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Sep 27 1995 |
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5751289, |
Oct 01 1992 |
University Corporation for Atmospheric Research |
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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 |
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5916300, |
Jul 18 1997 |
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5917325, |
Mar 21 1995 |
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5920194, |
May 06 1994 |
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5955667, |
Oct 11 1996 |
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Nov 13 1997 |
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6074693, |
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6107801, |
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6127827, |
Jul 22 1994 |
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6130539, |
Aug 19 1998 |
Metrotech Corporation |
Automatic gain control for a line locator |
6140819, |
May 26 1998 |
Heath Consultants, Inc. |
Continuous-depth-indicating underground pipe and cable locator |
6169958, |
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Mitsubishi Electric & Electronics USA, Inc |
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Intel Corporation |
Method and apparatus for personnel detection and tracking |
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Mar 03 1998 |
CASCADE ENGINEERING, INC |
RF embedded identification device |
6234218, |
Oct 13 1999 |
X-Pert Paint Mixing Systems, Inc.; X-PERT PAINT MIXING SYSTEMS, INC |
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6266006, |
Mar 08 1999 |
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Arrow detector |
6268731, |
Mar 07 1997 |
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6299934, |
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6375038, |
Oct 28 1999 |
DAANSEN U S A INC ; DAANSEN USA, INC A CORP OF NEW HAMPSHIRE |
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STANLEY WORKS, THE |
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6552548, |
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