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
CA711137A
Inventor
B. Kimbrell Willard
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.)
FLEXWEIGHT DRILL PIPE Co
Original Assignee
FLEXWEIGHT DRILL PIPE Co
Publication date
Application grantedgrantedCritical
Publication of CA711137ApublicationCriticalpatent/CA711137A/en