Patent search ap:("SCHLUMBERGER TECHNOLOGY CORP") AND inv:"HENRY LOUIS" Page 1

1.

发明授权
Methods and apparatus for investigating earth formations wherein a fixed relationship is maintained between emitted current and measured potential difference 失效
Title translation: 在发射电流和测量的潜在差异之间保持固定关系的方法和装置用于调查地球形态

公开(公告)号：US3539910A

公开(公告)日：1970-11-10

申请号：US3539910D

申请日：1968-10-29

Applicant: SCHLUMBERGER TECHNOLOGY CORP

Inventor： HENRY LOUIS , SEEMAN BRONISLAV

IPC: G01V3/18 , G01V3/24

CPC classification number: G01V3/24 , G01V3/18

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