Schlumberger Electronics (UK) Limited

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5044207 Mass flow measurementExpiredMar 11, 88Sep 03, 91[G01F]
4922745 Fluid transducerExpiredMar 10, 88May 08, 90[G01N]
4908769 Commodity metering systemsExpiredJun 15, 87Mar 13, 90[G06F]
4896282 Flow computer calibration techniqueExpiredJan 07, 88Jan 23, 90[H03M]
4871886 Electronic key and receptacle thereforExpiredJun 15, 87Oct 03, 89[H01R]
4868487 Frequency response analyser with multiplying digital to analogue converterExpiredNov 16, 87Sep 19, 89[G01R]
4868494 Methods and apparatus for frequency response analysisExpiredFeb 08, 88Sep 19, 89[G01R]
4865462 ThermocouplesExpiredMar 07, 88Sep 12, 89[G01K]
4833405 Shaft failure monitoring system using angled rotating teeth and phase detectionExpiredMar 23, 88May 23, 89[G01B, G01R]
4831304 SensorsExpiredJan 21, 88May 16, 89[H01L]
4669030 Enclosure for electrical circuitry having a housing with a reversible backplateExpiredNov 30, 84May 26, 87[H05K]
4663965 Pressure monitoringExpiredNov 16, 84May 12, 87[G01M]
4519251 Roller-type ultrasonic inspection device with acoustical isolationExpiredSep 06, 83May 28, 85[G01N]
4502793 Apparatus and method for measuring temperature profileExpiredNov 23, 82Mar 05, 85[G01J]
4472974 Roller-type ultrasonic inspection devicesExpiredDec 07, 82Sep 25, 84[G01N]

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