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.)
National Refractories and Minerals Corp
Original Assignee
National Refractories and Minerals Corp
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 US05/524,903external-prioritypatent/US3963508A/en
Application filed by National Refractories and Minerals CorpfiledCriticalNational Refractories and Minerals Corp
Application grantedgrantedCritical
Publication of AU491469B2publicationCriticalpatent/AU491469B2/en
Publication of AU8540475ApublicationCriticalpatent/AU8540475A/en