-
-
-
-
-
-
-
-
Internal retention mechanism
-
Patent number 8,267,174
-
Issue date Sep 18, 2012
-
Halliburton Energy Services Inc.
-
Henry E. Rogers
-
E21 - EARTH DRILLING MINING
-
-
-
-
-
Reverse cementing float equipment
-
Patent number 7,533,729
-
Issue date May 19, 2009
-
Halliburton Energy Services, Inc.
-
Henry E. Rogers
-
Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC
-
-
-
Equalizer valve assembly
-
Patent number 7,322,413
-
Issue date Jan 29, 2008
-
Halliburton Energy Services, Inc.
-
Henry E. Rogers
-
E21 - EARTH DRILLING MINING
-
-
-
-
-
-
-
PDF valve
-
Patent number 6,725,935
-
Issue date Apr 27, 2004
-
Halliburton Energy Services, Inc.
-
David D. Szarka
-
E21 - EARTH DRILLING MINING
-
-
-
PDF valve
-
Patent number 6,547,007
-
Issue date Apr 15, 2003
-
Halliburton Energy Services, Inc.
-
David D. Szarka
-
E21 - EARTH DRILLING MINING
-
Float valve assembly and method
-
Patent number 6,497,291
-
Issue date Dec 24, 2002
-
Halliburton Energy Services, Inc.
-
David D. Szarka
-
E21 - EARTH DRILLING MINING
-
-
-