13 SUBSURFACE WELL COMPLETION EQUIPMENT-NAMELY, LOCATING AND LOCKING DEVICES SUCH AS LANDING NIPPLES, ADJUSTABLE UNIONS, TUBING HANGERS, LOCKING MANDRELS, AND BALL VALVE NIPPLES FOR WELLS
Trademark Events
Feb 19, 1996
Expired Sec. 9
May 26, 1981
Registered - Sec. 8 (6-Yr) Accepted & Sec. 15 Ack.