Assignee
PARAMAGNETIC LOGGING INC
US·17 granted patents·854 citations·filing 1982–1996
Top patents by PatentIndex Score
17 records- 0194US5043668AMethods and apparatus for measurement of electronic properties of geological formations through borehole casingPARAMAGNETIC LOGGING INC·Filed 1989·Granted Aug 27, 1991·89 cites·76 claims
- 0294US4882542AMethods and apparatus for measurement of electronic properties of geological formations through borehole casingPARAMAGNETIC LOGGING INC·Filed 1987·Granted Nov 21, 1989·94 cites·80 claims
- 0392US4528508ANuclear magnetic resonance method and apparatus for remote detection and volumetric measurement of petroleum reservesPARAMAGNETIC LOGGING INC·Filed 1982·Granted Jul 9, 1985·59 cites·31 claims
- 0491US4820989AMethods and apparatus for measurement of the resistivity of geological formations from within cased boreholesPARAMAGNETIC LOGGING INC·Filed 1986·Granted Apr 11, 1989·76 cites·22 claims
- 0587US5717334AMethods and apparatus to produce stick-slip motion of logging tool attached to a wireline drawn upward by a continuously rotating wireline drumPARAMAGNETIC LOGGING INC·Filed 1995·Granted Feb 10, 1998·113 cites·5 claims
- 0685US4748415AMethods and apparatus for induction logging in cased boreholesPARAMAGNETIC LOGGING INC·Filed 1986·Granted May 31, 1988·47 cites·23 claims
- 0785US4656422AOil well logging tools measuring paramagnetic logging effect for use in open boreholes and cased well boresPARAMAGNETIC LOGGING INC·Filed 1985·Granted Apr 7, 1987·54 cites·43 claims
- 0880US5570024ADetermining resistivity of a formation adjacent to a borehole having casing using multiple electrodes and with resistances being defined between the electrodesPARAMAGNETIC LOGGING INC·Filed 1993·Granted Oct 29, 1996·39 cites·2 claims
- 0980US4901023AMethods and apparatus for measurement of low frequency a.c. magnetic fields within cased boreholes to determine properties of geological formationsPARAMAGNETIC LOGGING INC·Filed 1988·Granted Feb 13, 1990·38 cites·18 claims
- 1079US5075626AElectronic measurement apparatus movable in a cased borehole and compensating for casing resistance differencesPARAMAGNETIC LOGGING INC·Filed 1989·Granted Dec 24, 1991·44 cites·21 claims
- 1178US4792757AOil well logging tools measuring paramagnetic logging effect for use in open boreholes and cased well boresPARAMAGNETIC LOGGING INC·Filed 1987·Granted Dec 20, 1988·47 cites·4 claims
- 1276US6025721ADetermining resistivity of a formation adjacent to a borehole having casing by generating constant current flow in portion of casing and using at least two voltage measurement electrodesPARAMAGNETIC LOGGING INC·Filed 1996·Granted Feb 15, 2000·44 cites·11 claims
- 1368US5633590AFormation resistivity measurements from within a cased well used to quantitatively determine the amount of oil and gas presentPARAMAGNETIC LOGGING INC·Filed 1994·Granted May 27, 1997·31 cites·10 claims
- 1464US5065100AMeasurement of in-phase and out-of-phase components of low frequency A.C. magnetic fields within cased boreholes to measure geophysical properties of geological formationsPARAMAGNETIC LOGGING INC·Filed 1990·Granted Nov 12, 1991·35 cites·16 claims
- 1555US4724385AAcoustic paramagnetic logging toolPARAMAGNETIC LOGGING INC·Filed 1986·Granted Feb 9, 1988·18 cites·25 claims
- 1646US4804918ADual excitation acoustic paramagnetic logging toolPARAMAGNETIC LOGGING INC·Filed 1988·Granted Feb 14, 1989·12 cites·2 claims
- 1741US6031381AElectrical voltages and resistances measured to inspect metallic cased wells and pipelinesPARAMAGNETIC LOGGING INC·Filed 1996·Granted Feb 29, 2000·14 cites·9 claims
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