Christopher Alan Sawdon
25Patents
12h-index
21Co-inventors
77Inventor score
Filing activity: Jan 31, 1995 → Nov 10, 2010
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6710019B1 | Wellbore fluid | Emerging Cross-Sectional Technologies | 146 | Expired |
| US6770603B1 | Electrically conductive non-aqueous wellbore fluids | Emerging Cross-Sectional Technologies | 72 | Expired |
| US8242059B2 | Wellbore fluid | Chemistry; Metallurgy | 44 | Active |
| US6861394B2 | Internal breaker | Emerging Cross-Sectional Technologies | 44 | Expired |
| US6787505B1 | Electrically conductive non-aqueous wellbore fluids | Chemistry; Metallurgy | 41 | Expired |
| US7262152B2 | Reversible emulsions stabilized by amphiphilic polymers and application to drilling fluid | Chemistry; Metallurgy | 39 | Expired |
| US6586372B1 | Additive for increasing the density of a fluid and fluid comprising such additive | Emerging Cross-Sectional Technologies | 34 | Expired |
| US5846913A | Invert biodegradable n-alkane(s) wellbore fluid containing less than 10 percent by weight of cycloparaffing isoparaffing and aromatic compounds, and method of drilling with such fluid | Emerging Cross-Sectional Technologies | 28 | Expired |
| US5627143A | Wellbore fluid | Chemistry; Metallurgy | 23 | Expired |
| US7854277B2 | Wellbore fluid comprising a base fluid and a particulate bridging agent | Chemistry; Metallurgy | 17 | Active |
| US6803347B1 | Additive for wellbore fluids | Emerging Cross-Sectional Technologies | 16 | Expired |
| US7267291B2 | Additive for increasing the density of an oil-based fluid and fluid comprising such additive | Emerging Cross-Sectional Technologies | 13 | Expired |
| US5962375A | Wellbore fluids | Emerging Cross-Sectional Technologies | 11 | Expired |
| US7449431B2 | Additive for increasing the density of a fluid for casing annulus pressure control | Emerging Cross-Sectional Technologies | 11 | Expired |
| US7727939B2 | Composition of base fluid and polymeric dispersing agent-absorbed polymer-coated colloidal particles | Emerging Cross-Sectional Technologies | 10 | Expired |
| US7589049B2 | Additive for increasing the density of a fluid for casing annulus pressure | Chemistry; Metallurgy | 10 | Expired |
| US7745380B2 | Additive for increasing the density of a fluid for casing annulus pressure control | Emerging Cross-Sectional Technologies | 8 | Active |
| US7651040B2 | Additive for increasing the density of an oil-based fluid and fluid comprising such additive | Emerging Cross-Sectional Technologies | 8 | Active |
| US8006761B2 | Wellbore fluid comprising a base fluid and a particulate bridging agent | Chemistry; Metallurgy | 6 | Active |
| US7538074B2 | Additive for increasing the density of an oil-based fluid and fluid comprising such additive | Emerging Cross-Sectional Technologies | 5 | Active |
| US7427582B2 | Internal breaker | Emerging Cross-Sectional Technologies | 5 | Expired |
| US7919437B2 | Wellbore fluid comprising sulfonated copolymers with pendant alkyl groups | Chemistry; Metallurgy | 5 | Active |
| US7943554B2 | Wellbore fluid comprising at least one polymer containing pendant alkyl groups | Chemistry; Metallurgy | 3 | Active |
| US7928039B2 | Reversible emulsions stabilized by amphiphilic polymers | Chemistry; Metallurgy | 1 | Active |
| US8122959B2 | Methods and materials for zonal isolation | Chemistry; Metallurgy | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.