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
CA796061A
Inventor
C. Tullis Lyell
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.)
Giddings and Lewis LLC
Original Assignee
Giddings and Lewis LLC
Publication date
Application grantedgrantedCritical
Publication of CA796061ApublicationCriticalpatent/CA796061A/en