1
Clyde A Willis, Clyde D Durrett: Apparatus for gripping a down hole tubular for support and rotation. W N Apache Corporation, Willian Brinks Hofer Gilson & Lione, March 29, 1994: US05297833 (130 worldwide citation)

An apparatus for gripping a down hole tubular for support and rotation, or a string of such tubulars, includes a body element adapted to be rotated at high torques either by a top head drive or a rotary table of an earth drilling machine. Gripping elements are mounted in a central cavity of the body ...


2
Willis Clyde A, Durrett Clyde Doyle: Appareil servant a saisir du materiel tubulaire de pompage, Apparatus for gripping a down hole tubular. W N Apache Corporation, CASSAN MACLEAN, May 26, 1994: CA2148346 (6 worldwide citation)

An apparatus for gripping a down hole tubular for support and rotation, or a string of such tubulars, includes a body element (10) adapted to be rotated at high torques either by a top head drive or a rotary table of an earth drilling machine. Gripping elements (28) are mounted in a central cavity o ...


3
Willis Clyde A, Durrett Clyde Doyle: Apparatus for gripping a down hole tubular. Apache, March 20, 1996: EP0701531-A1

An apparatus for gripping a down hole tubular for support and rotation, or a string of such tubulars, includes a body element (10) adapted to be rotated at high torques either by a top head drive or a rotary table of an earth drilling machine. Gripping elements (28) are mounted in a central cavity o ...


4
Willis Clyde A, Durrett Clyde Doyle: Apparatus for gripping a down hole tubular. W N Apache Corporation, WEBB William A, May 26, 1994: WO/1994/011291

An apparatus for gripping a down hole tubular for support and rotation, or a string of such tubulars, includes a body element (10) adapted to be rotated at high torques either by a top head drive or a rotary table of an earth drilling machine. Gripping elements (28) are mounted in a central cavity o ...