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
Inventor
S. Rogers Austin
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.)
Houston Oil Field Material Co Inc
Original Assignee
Houston Oil Field Material Co Inc
Publication date
Application grantedgrantedCritical
Publication of CA708436ApublicationCriticalpatent/CA708436A/en