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
CA215,629A
Inventor
Hans P.O. Lundstrom
Ernst L. Johansson
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.)
Sandco Ltd
Original Assignee
Sandco Ltd
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
Application filed by Sandco LtdfiledCriticalSandco Ltd
Priority to CA215,629ApriorityCriticalpatent/CA1005665A/en
Application grantedgrantedCritical
Publication of CA1005665ApublicationCriticalpatent/CA1005665A/en