Frank E. Evans
11Patents
6h-index
17Co-inventors
63Inventor score
Filing activity: Feb 23, 1976 → Apr 27, 2015
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US9034800B2 | Fluid loss additives and methods of making and using same | Chemistry; Metallurgy | 34 | Active |
| US6355600B1 | Shale stabilizing drilling fluids comprising calcium chloride and low molecular weight low charge cationicpolyacrylamide copolymers | Chemistry; Metallurgy | 21 | Expired |
| US4061360A | Collapsible golf bag cart | Emerging Cross-Sectional Technologies | 9 | Expired |
| US6855671B2 | Water based fluids comprising multivalent salts and low molecular weight, low charge cationic polyacrylamide copolymers | Chemistry; Metallurgy | 8 | Expired |
| US7152697B2 | Delayed phase changing agent for invert emulsion drilling fluid | Emerging Cross-Sectional Technologies | 8 | Expired |
| US9353306B2 | Viscoelastic surfactant based wellbore fluids and methods of use | Chemistry; Metallurgy | 7 | Active |
| US8937034B2 | Viscoelastic surfactant based wellbore fluids and methods of use | Chemistry; Metallurgy | 3 | Active |
| US8575072B2 | Fluid loss additives and methods of making and using same | Chemistry; Metallurgy | 2 | Active |
| US9328280B2 | Additives for oil-based drilling fluids | Emerging Cross-Sectional Technologies | 1 | Active |
| US8871097B2 | Reclamation of formate brines | Chemistry; Metallurgy | 0 | Active |
| US9598627B2 | Fluid loss additives and methods of making and using same | Chemistry; Metallurgy | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.