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.)
WR Grace and Co Conn
Original Assignee
WR Grace and Co
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 US05/784,184external-prioritypatent/US4178220A/en
Application filed by WR Grace and CofiledCriticalWR Grace and Co
Priority to CA000378797ApriorityCriticalpatent/CA1118386A/fr
Application grantedgrantedCritical
Publication of CA1118386ApublicationCriticalpatent/CA1118386A/fr