BJ-Hughes Inc.
35Patents
0Active
35Granted
37Portfolio score
Filing activity: Oct 10, 1973 → Aug 4, 1981
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4275788A | Method of plugging a well | Chemistry; Metallurgy | 91 | Expired |
| US4304433A | Pipe gripping head | Fixed Constructions | 71 | Expired |
| US4132243A | Apparatus for feeding perforation sealer balls and the like into well treating fluid | Emerging Cross-Sectional Technologies | 55 | Expired |
| US4345864A | Pipe manipulator | Emerging Cross-Sectional Technologies | 46 | Expired |
| US4351116A | Apparatus for making multiple orientation measurements in a drill string | Fixed Constructions | 45 | Expired |
| US4126348A | Universal handling head for a pipe racker | Fixed Constructions | 42 | Expired |
| US4187546A | Computer-controlled oil drilling rig having drawworks motor and brake control arrangement | Fixed Constructions | 39 | Expired |
| US4042014A | Multiple stage cementing of well casing in subsea wells | Fixed Constructions | 33 | Expired |
| US4139891A | Elevator load control arrangement for a computer-controlled oil drilling rig | Fixed Constructions | 29 | Expired |
| US3996737A | Method of manufacturing elevator links and a cast elevator link blank for use in the method | Performing Operations; Transporting | 24 | Expired |
| US4128888A | Velocity control arrangement for a computer-controlled oil drilling rig | Fixed Constructions | 23 | Expired |
| US4361940A | Slip-type elevator locking mechanism | Fixed Constructions | 19 | Expired |
| US4345648A | Inflatable packer system | Fixed Constructions | 17 | Expired |
| US4030746A | Pipe handling head | Fixed Constructions | 16 | Expired |
| US4050512A | Stroke actuated well testing tool | Fixed Constructions | 15 | Expired |
| US4316504A | Check/relief valve for an inflatable packer system | Emerging Cross-Sectional Technologies | 12 | Expired |
| US4109800A | Multi-stage well-drilling mast assembly | Fixed Constructions | 10 | Expired |
| US4109488A | Shock absorbing rotary drive coupling | Mechanical Engineering; Lighting; Heating | 9 | Expired |
| US3999260A | Rotary power slip assembly | Fixed Constructions | 9 | Expired |
| US4216590A | Wide angle inclinometer | Fixed Constructions | 9 | Expired |
| US4333209A | Rotary power slips | Fixed Constructions | 8 | Expired |
| US4332619A | Expansive admixture | Chemistry; Metallurgy | 8 | Expired |
| US4328038A | Resin coated aluminum | Emerging Cross-Sectional Technologies | 8 | Expired |
| USRE29830E | Cementing plug launching apparatus | General | 7 | Expired |
| US4320803A | Valve retrieval mechanism for an inflatable packer system | Fixed Constructions | 7 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.