Anadrill, Inc.
25Patents
0Active
25Granted
36Portfolio score
Filing activity: Aug 15, 1986 → Nov 22, 1991
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5092687A | Diamond thrust bearing and method for manufacturing same | Mechanical Engineering; Lighting; Heating | 427 | Expired |
| US5139094A | Directional drilling methods and apparatus | Fixed Constructions | 105 | Expired |
| US5253939A | High performance bearing pad for thrust bearing | Mechanical Engineering; Lighting; Heating | 93 | Expired |
| US4958125A | Method and apparatus for determining characteristics of the movement of a rotating drill string including rotation speed and lateral shocks | Physics | 83 | Expired |
| US4847815A | Sinusoidal pressure pulse generator for measurement while drilling tool | Fixed Constructions | 78 | Expired |
| US4805449A | Apparatus and method for measuring differential pressure while drilling | Fixed Constructions | 68 | Expired |
| US5117927A | Downhole adjustable bent assemblies | Fixed Constructions | 68 | Expired |
| US4887464A | Measurement system and method for quantitatively determining the concentrations of a plurality of gases in drilling mud | Fixed Constructions | 65 | Expired |
| US5181576A | Downhole adjustable stabilizer | Fixed Constructions | 56 | Expired |
| US4739841A | Methods and apparatus for controlled directional drilling of boreholes | Fixed Constructions | 53 | Expired |
| US4876886A | Method for detecting drilling events from measurement while drilling sensors | Fixed Constructions | 51 | Expired |
| US4760735A | Method and apparatus for investigating drag and torque loss in the drilling process | Fixed Constructions | 50 | Expired |
| US4852399A | Method for determining drilling conditions while drilling | Fixed Constructions | 47 | Expired |
| US5146433A | Mud pump noise cancellation system and method | Fixed Constructions | 44 | Expired |
| US5063776A | Method and system for measurement of fluid flow in a drilling rig return line | Physics | 42 | Expired |
| US5154078A | Kick detection during drilling | Fixed Constructions | 42 | Expired |
| US5033557A | Hydraulic drilling jar | Fixed Constructions | 41 | Expired |
| US4949575A | Formation volumetric evaluation while drilling | Fixed Constructions | 40 | Expired |
| US4833914A | Pore pressure formation evaluation while drilling | Fixed Constructions | 40 | Expired |
| US4941951A | Method for improving a drilling process by characterizing the hydraulics of the drilling system | Fixed Constructions | 35 | Expired |
| US4956921A | Method to improve directional survey accuracy | Fixed Constructions | 33 | Expired |
| US4976143A | System and method for monitoring drill bit depth | Fixed Constructions | 30 | Expired |
| US5267398A | Method for manufacturing a diamond thrust bearing | Emerging Cross-Sectional Technologies | 29 | Expired |
| US5275040A | Method of and apparatus for detecting an influx into a well while drilling | Fixed Constructions | 27 | Expired |
| US4981036A | Method of determining the porosity of an underground formation being drilled | Fixed Constructions | 10 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.