Tools – Wrench – screwdriver – or driver therefor – Turret head
Reexamination Certificate
2006-05-02
2006-05-02
Wilson, Lee D. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Turret head
C081S057150
Reexamination Certificate
active
07036397
ABSTRACT:
An improved die insert for gripping oil field tubular members in tubular handling systems such as power tongs, slips, safety clamps and the like. The die insert has a gripping surface which comprises a backing surface adapted to contact the tubular member. The backing surface may be smooth or it may have a series of teeth formed thereon. The backing surface further has a granulated particle coating applied thereto which forms the gripping surface of the present invention. In a preferred embodiment, the gripping surface will include a refractory metal carbide selected from the group consisting of the carbides of silicon, tungsten, molybdenum, chromium, tantalum, niobium, vanadium, titanium, zirconium, and boron.
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Kinzel, Buttner;Evaluation of Corrosion on CRA-Pipe; Sep. 9, 1996; Kuala Lumpur, Malaysia.
Advertisement published by C4 Carbides in Great Britain more than one year prior to the filing of U.S. Appl. No. 08/713,444, filed on Sep. 13, 1996 (now abandoned), entitled “The Use of High Friction Materials”.
Jones, Walker, Waechter, Poitevent, Carrere, & Denegre, L.L
Wilson Lee D.
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