James Fehr
11Patents
5h-index
12Co-inventors
59Inventor score
Filing activity: Aug 6, 1998 → Apr 10, 2017
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6158513A | Multiple string completion apparatus and method | Fixed Constructions | 35 | Expired |
| US9121255B2 | Stage tool for wellbore cementing | Fixed Constructions | 32 | Active |
| US6202762A | Flow restrictor valve for a downhole drilling assembly | Fixed Constructions | 24 | Expired |
| US6290002A | Pneumatic hammer drilling assembly for use in directional drilling | Fixed Constructions | 16 | Expired |
| US7722449B2 | Air channel grill for security institutions | Mechanical Engineering; Lighting; Heating | 7 | Active |
| US9574414B2 | Wellbore tool with indexing mechanism and method | Fixed Constructions | 5 | Active |
| US9404343B2 | Wireline conveyed apparatus for wellbore fluid treatment | Fixed Constructions | 2 | Active |
| US9151148B2 | Plug retainer and method for wellbore fluid treatment | Fixed Constructions | 2 | Active |
| US9650868B2 | Stage tool for wellbore cementing | Fixed Constructions | 1 | Active |
| US10273781B2 | Stage tool for wellbore cementing | Fixed Constructions | 1 | Active |
| US9932797B2 | Plug retainer and method for wellbore fluid treatment | Fixed Constructions | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.