Paul Howlett
38Patents
16h-index
5Co-inventors
74Inventor score
Filing activity: Feb 4, 1998 → Feb 28, 2018
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6253861A | Circulation tool | Fixed Constructions | 192 | Expired |
| US6220357A | Downhole flow control tool | Fixed Constructions | 129 | Expired |
| US6609569B2 | Downhole fluid sampler | Fixed Constructions | 63 | Expired |
| US6250387A | Apparatus for catching debris in a well-bore | Fixed Constructions | 51 | Expired |
| US6655462B1 | Magnetic well cleaning apparatus | Fixed Constructions | 50 | Expired |
| US6152221A | Apparatus with retractable cleaning members | Fixed Constructions | 46 | Expired |
| US6102060A | Detachable locking device for a control valve and method | Emerging Cross-Sectional Technologies | 42 | Expired |
| US7322408B2 | Downhole tool with actuable barrier | Fixed Constructions | 35 | Expired |
| US7096950B2 | Combined milling and scraping tool | Fixed Constructions | 30 | Expired |
| US6227291A | Compact well clean up tool with multifunction cleaning apparatus | Fixed Constructions | 29 | Expired |
| US6152220A | Down-hole tool with centralising component | Fixed Constructions | 23 | Expired |
| US6302214A | Apparatus and method for inflating packers in a drilling well | Fixed Constructions | 20 | Expired |
| US6453996B1 | Apparatus incorporating jet pump for well head cleaning | Fixed Constructions | 19 | Expired |
| US6454009B2 | Apparatus and method for cleaning well risers | Fixed Constructions | 18 | Expired |
| US6401813B1 | Wellhead cleanup tool | Fixed Constructions | 17 | Expired |
| US6896064B2 | Compression set packer and method of use | Fixed Constructions | 17 | Expired |
| US6530429B2 | Downhole cleaning tool with shear clutch | Fixed Constructions | 16 | Expired |
| US7413023B2 | Wellhead seal unit | Fixed Constructions | 16 | Expired |
| US6279657A | Apparatus and method for circulating fluid in a well bore | Fixed Constructions | 14 | Expired |
| US7055605B2 | Downhole circulation valve operated by dropping balls | Fixed Constructions | 12 | Expired |
| US8511392B2 | Downhole swivel sub | Fixed Constructions | 12 | Active |
| US6343648B1 | Down-hole tool with detachable cleaning pads | Fixed Constructions | 10 | Expired |
| US6497295B1 | Torque limiting tool | Fixed Constructions | 10 | Expired |
| US8191639B2 | Downhole swivel sub | Fixed Constructions | 7 | Active |
| US7191835B2 | Disengagable burr mill | Fixed Constructions | 7 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.