Assignors: HARRIS, CHRISTOPHER KELVIN, MASON, STANLEY LEROY, VINEGAR, HAROLD J. 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 US79429806P external-priority Application filed by Individual filed Critical Individual Priority to US11/788,871 priority Critical patent/US7793722B2/en Assigned to SHELL OIL COMPANY reassignment SHELL OIL COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Original Assignee Individual 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 or warranty as to the accuracy of the list.) ( en Inventor Harold Vinegar Christopher Harris Stanley Mason Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Granted Application number US11/788,871 Other versions US7793722B2 Google Patents US20080017380A1 - Non-ferromagnetic overburden casing US20080017380A1 - Non-ferromagnetic overburden casing

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