Patent search ap:("PERFORATING GUNS ATLAS CORP") AND inv:"HERMANN JANSSEN" Page 1

1.

发明授权
Means for detecting changes in dielectric constant of thin strata of lithological formations traversed by a borehole 失效
Title translation: 用于检测钻孔穿过的岩性地层薄层介电常数变化的方法

公开(公告)号：US2722657A

公开(公告)日：1955-11-01

申请号：US36602353

申请日：1953-07-03

Applicant: PERFORATING GUNS ATLAS CORP

Inventor： HERMANN JANSSEN

IPC: G01V3/26

CPC classification number: G01V3/26

Patent Agency Ranking