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
CA237,949A
Inventor
John F. Frank
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.)
RL Crain Ltd
Original Assignee
RL Crain 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
Priority claimed from CA168,734Aexternal-prioritypatent/CA982168A/en
Application filed by RL Crain LtdfiledCriticalRL Crain Ltd
Priority to CA237,949ApriorityCriticalpatent/CA990314A/en
Application grantedgrantedCritical
Publication of CA990314ApublicationCriticalpatent/CA990314A/en