E21B 1/12

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Patent/Pub #TitleFiling DateIssue/Publication DatePatent Owner
9709768 Optical connectorDec 16, 14Jul 18, 17STATOIL PETROLEUM AS
8360155 Equalizer stopple fitting with integral pressure equalization fittingSep 05, 08Jan 29, 13OIL STATES INDUSTRIES, INC., QUALITY CONNECTOR SYSTEMS,
7841424 Power output mechanism for power toolsMay 08, 08Nov 30, 10Power Network Industry Co., Ltd.
7677329 Method and device for controlling drilling fluid pressureNov 24, 04Mar 16, 10ENHANCED DRILLING AS
7140450 Percussion toolOct 18, 04Nov 28, 06Battelle Energy Alliance, LLC
6675909 Hydraulic jarDec 26, 02Jan 13, 04Jack A. Milam, MILAM, JACK A.,
6439318 Downhole apparatusJun 27, 00Aug 27, 02NATIONAL OILWELL DHT, L.P.
6315063 Reciprocating rotary drilling motorNov 02, 99Nov 13, 01Not available
6138775 Boring machineJun 11, 98Oct 31, 00TRACTO-TECHNIK PAUL SCHMIDT SPEZIALMASCHINEN