Derry D. Sparlin
22Patents
13h-index
9Co-inventors
74Inventor score
Filing activity: Oct 4, 1974 → Nov 28, 1994
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5476143A | Well screen having slurry flow paths | Fixed Constructions | 119 | Expired |
| US4085801A | Control of incompetent formations with thickened acid-settable resin compositions | Chemistry; Metallurgy | 41 | Expired |
| US5787980A | Well screen having a uniform outer diameter | Fixed Constructions | 40 | Expired |
| US4771829A | Well liner with selective isolation screen | Performing Operations; Transporting | 37 | Expired |
| US5355949A | Well liner with dual concentric half screens | Fixed Constructions | 36 | Expired |
| US5355948A | Permeable isolation sectioned screen | Fixed Constructions | 33 | Expired |
| US4085802A | Use of thickened oil for sand control processes | Chemistry; Metallurgy | 32 | Expired |
| US4202411A | Acid soluble coating for well screens | Emerging Cross-Sectional Technologies | 30 | Expired |
| US5307984A | Method of manufacturing a selective isolation screen | Emerging Cross-Sectional Technologies | 24 | Expired |
| US5450898A | Gravity enhanced maintenance screen | Performing Operations; Transporting | 16 | Expired |
| US4034811A | Method for sealing a permeable subterranean formation | Fixed Constructions | 15 | Expired |
| US5246158A | Method of manufacturing a selective isolation screen | Emerging Cross-Sectional Technologies | 15 | Expired |
| US4239084A | Acid soluble coating for well screens | Fixed Constructions | 14 | Expired |
| US4064940A | Water control with polymers | Chemistry; Metallurgy | 10 | Expired |
| US4105618A | Control of incompetent formations with thickened compositions containing base-settable resin | Chemistry; Metallurgy | 9 | Expired |
| US3961972A | High strength silicate form and method for producing same | Chemistry; Metallurgy | 7 | Expired |
| US3949220A | Method for detecting and locating sand producing zones in friable, unconsolidated sandstone formations of subterranean formations | Physics | 4 | Expired |
| US4062403A | Pump-down sand washing tool | Fixed Constructions | 4 | Expired |
| US3940612A | Method for detecting and locating water-producing zones and/or water thief zones in subterranean formations | Physics | 3 | Expired |
| US4110275A | Control of incompetent formations with thickened acid-settable resin compositions | Chemistry; Metallurgy | 3 | Expired |
| US4027730A | Seal assembly for fluid injection pump-down tools | Fixed Constructions | 3 | Expired |
| US3939912A | Method for reducing the production of water from oil wells | Fixed Constructions | 2 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.