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
CA892905A
Inventor
G. Bixby Thomas
R. Holman Harrison
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.)
Phillips Drill Co Inc
Original Assignee
Phillips Drill Co Inc
Publication date
Application grantedgrantedCritical
Publication of CA892905ApublicationCriticalpatent/CA892905A/en