UNDERSGROUND SYSTEMS, INC.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4,886,980 Transmission line sensor apparatus operable with near zero current line conditionsExpiredAug 22, 88Dec 12, 89[H02J]
4,855,671 Electrical power line and substation monitoring apparatusExpiredMar 07, 88Aug 08, 89[G01R]
4,808,916 Power supply magnetic shunt for transmission line sensor moduleExpiredNov 14, 86Feb 28, 89[G01R]
4,808,917 Transmission line sensor apparatus operable with near zero current line conditionsExpiredNov 05, 85Feb 28, 89[G01R]
4,795,973 Line mounted apparatus for measuring line potentialExpiredMar 29, 88Jan 03, 89[G01R]
4,796,027 Apparatus for data transmission from multiple sources on a single channelExpiredFeb 10, 88Jan 03, 89[G08C]
4,794,327 Electrical parameter sensing module for mounting on and removal from an energized high voltage power conductorExpiredMay 11, 87Dec 27, 88[G01R, G08B]
4,794,328 Tool for mounting a sensor module on a live power transmission lineExpiredApr 07, 86Dec 27, 88[G01R]
4,786,862 Watchdog circuit for transmission line sensor moduleExpiredJun 09, 86Nov 22, 88[G01R, G06F]
4,777,381 Electrical power line and substation monitoring apparatus and systemsExpiredMay 11, 87Oct 11, 88[G08C, H02J]
4,758,962 Electrical power line and substation monitoring apparatus and systemsExpiredMay 05, 86Jul 19, 88[G01R, G08B]
4,746,241 Hinge clamp for securing a sensor module on a power transmission lineExpiredMar 31, 86May 24, 88[B25G, F16D]
4,724,381 RF antenna for transmission line sensorExpiredFeb 03, 86Feb 09, 88[G01R]
4,723,220 Apparatus for power measuring and calculating Fourier components of power line parametersExpiredMar 20, 86Feb 02, 88[G06F, H02J]
4,714,893 Apparatus for measuring the potential of a transmission line conductorExpiredMar 18, 86Dec 22, 87[G01R]
4,689,752 System and apparatus for monitoring and control of a bulk electric power delivery systemExpiredApr 13, 83Aug 25, 87[G01R, H04B]
4,635,055 Apparatus for measuring the temperature and other parameters of an electic power conductorExpiredDec 23, 83Jan 06, 87[B08C]
4,611,207 Apparatus for monitoring voltage on a high voltage overhead transmission lineExpiredOct 31, 83Sep 09, 86[G01R, G08B]

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