Douglas J. Murray
59Patents
28h-index
66Co-inventors
91Inventor score
Filing activity: Dec 24, 1975 → Jan 5, 2012
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5318122A | Method and apparatus for sealing the juncture between a vertical well and one or more horizontal wells using deformable sealing means | Fixed Constructions | 294 | Expired |
| US7325617B2 | Frac system without intervention | Fixed Constructions | 192 | Expired |
| US5425424A | Casing valve | Fixed Constructions | 156 | Expired |
| US7552779B2 | Downhole method using multiple plugs | Fixed Constructions | 134 | Active |
| US5318121A | Method and apparatus for locating and re-entering one or more horizontal wells using whipstock with sealable bores | Fixed Constructions | 118 | Expired |
| US7387158B2 | Self energized packer | Fixed Constructions | 115 | Expired |
| US5944108A | Method for multi-lateral completion and cementing the juncture with lateral wellbores | Fixed Constructions | 113 | Expired |
| US6012526A | Method for sealing the junctions in multilateral wells | Fixed Constructions | 97 | Expired |
| US6419026B1 | Method and apparatus for completing a wellbore | Fixed Constructions | 94 | Expired |
| US6561279B2 | Method and apparatus for completing a wellbore | Fixed Constructions | 92 | Expired |
| US7552777B2 | Self-energized downhole tool | Fixed Constructions | 79 | Expired |
| US5906238A | Downhole flow control devices | Emerging Cross-Sectional Technologies | 78 | Expired |
| US7392841B2 | Self boosting packing element | Fixed Constructions | 69 | Expired |
| US6041857A | Motor drive actuator for downhole flow control devices | Fixed Constructions | 68 | Expired |
| US6640895B2 | Expandable tubing joint and through-tubing multilateral completion method | Fixed Constructions | 67 | Expired |
| US6334486B1 | Downhole flow control devices | Emerging Cross-Sectional Technologies | 67 | Expired |
| US5156220A | Well tool with sealing means | Fixed Constructions | 63 | Expired |
| US4967841A | Horizontal well circulation tool | Fixed Constructions | 62 | Expired |
| US5316084A | Well tool with sealing means | Fixed Constructions | 55 | Expired |
| US6535585B1 | System and method for notification upon successful message delivery | Electricity | 48 | Expired |
| US6484800B2 | Downhole flow control devices | Emerging Cross-Sectional Technologies | 48 | Expired |
| US5832996A | Electro hydraulic downhole control device | Emerging Cross-Sectional Technologies | 47 | Expired |
| US4017989A | Wall frames with interlocking clips | Human Necessities | 47 | Expired |
| US7604062B2 | Electric pressure actuating tool and method | Fixed Constructions | 44 | Active |
| US7395856B2 | Disappearing plug | Fixed Constructions | 41 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.