| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 464018000 | FLEXIBLE COUPLING BETWEEN FLUID-CONDUCTING ROTARY SHAFTS (E.G., COUPLING BETWEEN SECTIONS OF DRILL STRING, ETC.) | 7 |
| 20090209352 | Energy managing keel joint - A keel joint protector, which, in certain aspects, includes a body made of flexible material, a central open bore through the body, and the body having a plurality of spaced-apart energy management zones therein for diffusing a force applied to a particular part of the body. This abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure and is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims, 37 CFR 1.72(b). | 08-20-2009 |
| 20110294583 | DRILLING APPARATUS - The invention discloses a cushion sub-assembly ( | 12-01-2011 |
| 20120088588 | SUCKER ROD - A sucker rod, including: a rod; a threaded casing disposed outside the rod; a wedge-shaped groove disposed at one end of the rod; an outer connecting screw thread close to the wedge-shaped groove and disposed outside the rod; a wedge-shaped bulge disposed at the other end of the rod; a positioning nut close to the wedge-shaped bulge and matching with the threaded casing and disposed outside the rod; an inner nut flexibly disposed outside the rod between the positioning nut and the wedge-shaped bulge; and an outer nut flexibly disposed outside the rod for cooperation with the threaded casing; a convex plate disposed inside one end of the threaded casing for cooperation with the positioning nut; and an inner connecting screw thread disposed at the other end of the threaded casing for cooperation with the outer connecting screw thread. The sucker rod has a high torsional strength and is stable. | 04-12-2012 |
| 464020000 | Including member deformable by relative movement between shafts | 4 |
| 20090023502 | DOWNHOLE SHOCK ABSORBER FOR TORSIONAL AND AXIAL LOADS - A shock-absorber subassembly for a subsurface drilling assembly is disclosed. The shock-absorber subassembly comprises a mandrel, a body assembly, and at least one torsional spring assembly. The mandrel has a bore extending therethrough and has one end connectable to a portion of the subsurface drilling assembly. The body assembly has a bore extending therethrough and one end connectable to another portion of the subsurface drilling assembly. The body assembly is coupled to the mandrel to establish fluid communication between the bore of the mandrel and the bore of the body assembly and to permit planar rotational movement of the mandrel relative to the body assembly. The at least one torsional spring assembly engages the mandrel and the body assembly to absorb torsional shocks and vibrations between the mandrel and the body assembly and to limit the degree of planar rotation between the mandrel and the body assembly. In a second embodiment, the body assembly is coupled to the mandrel to permit axial movement as well as planar rotational movement. In this second embodiment, the shock-absorber subassembly further comprises at least one axial spring assembly engaging the mandrel and the body assembly to absorb axial shocks and vibrations between the mandrel and the body assembly. | 01-22-2009 |
| 20090048028 | Sealing Element and a Coupling Device Provided with Such a Sealing Element - A sealing element including a tube-shaped body of metallic material and first and second male sealing members arranged at a respective end of the body. At least two intermediate members are arranged in series in the body between the first and second male sealing members. Each one of the intermediate members is compressible so as to be capable to store elastic energy when the body is subjected to axial compression and includes a protuberance arranged in the body and extending around the center axis of the body. A coupling device provided with such a sealing element. | 02-19-2009 |
| 20130157767 | FLOATING SUB TOOL - An axially-floating sub tool for axial load compensation in conjunction with a top drive comprises cylindrical upper and lower members, with the upper member being coaxially disposed within a cylindrical housing. The upper member has an upper section slidably disposed within an opening in the upper end of the housing, plus a middle section that slidably and sealingly engages the housing bore. The lower-member bore has a splined upper interval, and a coaxial stinger extending upward from an annular shoulder medially located in the lower-member bore. The lower member is connected to the lower end of the housing with the stinger slidingly and sealingly disposed within the upper-member bore, and with the lower-member splines slidingly engaging the upper-member splines, thus defining upper, middle, and lower annular chambers, with the middle and lower chambers in fluid communication, and with a regulator/check valve regulating pressure in the middle and lower chambers. | 06-20-2013 |
| 464021000 | Member is coiled spring | 1 |
| 20090280912 | COUPLING DEVICE - Coupling device ( | 11-12-2009 |
