申请人 |
SCHLUMBERGER TECHNOLOGY B.V.;SCHLUMBERGER HOLDINGS LIMITED;SCHLUMBERGER CANADA LIMITED;SERVICES PETROLIERS SCHLUMBERGER;PRAD RESEARCH AND DEVELOPMENT LIMITED;SHEPPARD, MICHAEL;JOHNSON, ASHLEY;DOWNTON, GEOFFREY |
发明人 |
SHEPPARD, MICHAEL;JOHNSON, ASHLEY;DOWNTON, GEOFFREY |