Neil H. Akkerman
82Patents
22h-index
18Co-inventors
85Inventor score
Filing activity: Oct 15, 1976 → Feb 25, 2020
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4852648A | Well installation in which electrical current is supplied for a source at the wellhead to an electrically responsive device located a substantial distance below the wellhead | Emerging Cross-Sectional Technologies | 97 | Expired |
| US5195721A | Fail safe valve actuator | Emerging Cross-Sectional Technologies | 86 | Expired |
| US8551163B2 | Cardiac support systems and methods for chronic use | Electricity | 77 | Active |
| US5513703A | Methods and apparatus for perforating and treating production zones and otherwise performing related activities within a well | Fixed Constructions | 74 | Expired |
| US4440223A | Well slip assemblies | Fixed Constructions | 69 | Expired |
| US4475599A | Valve for subterranean wells | Emerging Cross-Sectional Technologies | 34 | Expired |
| US4103744A | Safety valve and ball type equalizing valve | Emerging Cross-Sectional Technologies | 34 | Expired |
| US4225110A | Actuator for converting linear to rotary motion | Emerging Cross-Sectional Technologies | 33 | Expired |
| US4135547A | Quick disengaging valve actuator | Mechanical Engineering; Lighting; Heating | 32 | Expired |
| US5295907A | Rorque limiting device | Mechanical Engineering; Lighting; Heating | 30 | Expired |
| US5095978A | Hydraulically operated permanent type well packer assembly | Fixed Constructions | 29 | Expired |
| US5465786A | Subsurface tubing safety valve | Fixed Constructions | 29 | Expired |
| US4062406A | Valve and lubricator apparatus | Fixed Constructions | 27 | Expired |
| US5411096A | Surface controlled, subsurface tubing safety valve | Fixed Constructions | 27 | Expired |
| US4393929A | Well packers and slip assemblies for use therewith | Fixed Constructions | 26 | Expired |
| US4540047A | Flow controlling apparatus | Fixed Constructions | 25 | Expired |
| US4591197A | Wire line running and/or pulling tool | Fixed Constructions | 25 | Expired |
| US4325431A | Flow controlling apparatus | Fixed Constructions | 25 | Expired |
| US5263847A | Subsurface tubing safety valve | Emerging Cross-Sectional Technologies | 24 | Expired |
| US4421174A | Cyclic annulus pressure controlled oil well flow valve and method | Fixed Constructions | 24 | Expired |
| US4768594A | Valves | Fixed Constructions | 23 | Expired |
| US4641707A | Well apparatus | Fixed Constructions | 22 | Expired |
| US4407363A | Subsurface well apparatus | Fixed Constructions | 21 | Expired |
| US4542792A | Method and removable auxiliary apparatus for permanently locking open a well flow control device | Fixed Constructions | 20 | Expired |
| US4488595A | Well tool having a slip assembly | Emerging Cross-Sectional Technologies | 20 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.