Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US06/616,325external-prioritypatent/US4845433A/en
Priority claimed from US06/616,327external-prioritypatent/US4780678A/en
Priority claimed from US06/616,326external-prioritypatent/US4739272A/en
Priority claimed from US06/616,323external-prioritypatent/US4712070A/en
Priority claimed from NO851741Aexternal-prioritypatent/NO172086C/en
Publication of NO893407LpublicationCriticalpatent/NO893407L/en
Application filed by Schlumberger LtdfiledCriticalSchlumberger Ltd
Priority to NO893407ApriorityCriticalpatent/NO893407D0/en
Publication of NO893407D0publicationCriticalpatent/NO893407D0/en