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
CA841531A
Inventor
Hoffmann Alfred
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.)
DURICAST STONE Ltd
WILLIAM T H CLARK
Original Assignee
DURICAST STONE Ltd
WILLIAM T H CLARK
Publication date
Application grantedgrantedCritical
Publication of CA841531ApublicationCriticalpatent/CA841531A/en