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
CA771864A
Inventor
I. Ashworth Stewart
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.)
Abrasive Developments Ltd
Original Assignee
Abrasive Developments Ltd
Publication date
Application grantedgrantedCritical
Publication of CA771864ApublicationCriticalpatent/CA771864A/en