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公开(公告)号：US3371312A
公开(公告)日：1968-02-27
申请号：US41451864
申请日：1964-11-23
Applicant: DRESSER IND
Inventor： HOPKINSON ERIC C
IPC: G01V5/04
CPC classification number: G01V5/04
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12.发明授权Pulse transmission over a long cable in the presence of a low frequency power 失效在存在低频功率的情况下通过长电缆进行脉冲传输
公开(公告)号：US3192386A
公开(公告)日：1965-06-29
申请号：US26195163
申请日：1963-02-27
Applicant: DRESSER IND
Inventor： HOPKINSON ERIC C
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Patent Agency Ranking13.发明授权
公开(公告)号：US3564248A
公开(公告)日：1971-02-16
申请号：US3564248D
申请日：1967-11-29
Applicant: DRESSER IND
Inventor： HOPKINSON ERIC C , YOUMANS ARTHUR H
CPC classification number: G01V5/108
Abstract: A well logging instrument having a pair of radiation detector circuits and a pulsed neutron source are coupled through a cable to the surface electronics and calibration controls. A first switch is provided at the surface for causing the neutron source to operate continuously and a second switch is provided to effect a change in the gain of one of the radiation detector circuits, thus providing means for comparison of the sensitivities of the two detection circuits. An adjustable observation gate in the surface electronics, in conjunction with a digital time interval counter, is used to measure the time elapsed between sync pulses and the beginning and ending of each of the two detection gates.
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14.发明授权
公开(公告)号：US3387145A
公开(公告)日：1968-06-04
申请号：US40968764
申请日：1964-11-09
Applicant: DRESSER IND
Inventor： HOPKINSON ERIC C
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公开(公告)号：US3358142A
公开(公告)日：1967-12-12
申请号：US36115964
申请日：1964-04-20
Applicant: DRESSER IND
Inventor： HOPKINSON ERIC C , MARSHALL ALEXANDER B C
IPC: G01V5/10
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公开(公告)号：US3309522A
公开(公告)日：1967-03-14
申请号：US45690265
申请日：1965-05-13
Applicant: DRESSER IND
Inventor： YOUMANS ARTHUR H , HOPKINSON ERIC C
IPC: H05H3/06
CPC classification number: H05H3/06
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公开(公告)号：US3176136A
公开(公告)日：1965-03-30
申请号：US14182361
申请日：1961-09-29
Applicant: DRESSER IND
Inventor： HOPKINSON ERIC C
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