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.)
Expired
Application number
CA903584A
Inventor
R. Lightfoot David
H. Sowden Roy
Original Assignee
WR Grace and Co
Publication date
Application grantedgrantedCritical
Publication of CA903584ApublicationCriticalpatent/CA903584A/en