Legal status (The legal status 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 status listed.)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schlumberger Canada Ltd
Original Assignee
Individual
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 US07/786,137external-prioritypatent/US5235285A/en
Priority claimed from US07/955,101external-prioritypatent/US5339037A/en
Application filed by IndividualfiledCriticalIndividual
Priority claimed from CA 2081790external-prioritypatent/CA2081790C/fr
Publication of CA2254490A1publicationCriticalpatent/CA2254490A1/fr
Application grantedgrantedCritical
Publication of CA2254490CpublicationCriticalpatent/CA2254490C/fr