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.)
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 US05/763,112external-prioritypatent/US4089377A/en
Application filed by Societe National Elf AquitainefiledCriticalSociete National Elf Aquitaine
Priority to CA345,487ApriorityCriticalpatent/CA1087520A/fr
Application grantedgrantedCritical
Publication of CA1087520ApublicationCriticalpatent/CA1087520A/fr