Curtis Ring
21Patents
9h-index
12Co-inventors
72Inventor score
Filing activity: Nov 25, 1974 → Dec 6, 2019
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5875841A | Oil well blow-out preventer | Emerging Cross-Sectional Technologies | 30 | Expired |
| US5996688A | Hydraulic pump jack drive system for reciprocating an oil well pump rod | Mechanical Engineering; Lighting; Heating | 22 | Expired |
| US3986439A | Piston and slipper arrangement for hydraulic pump or motor | Mechanical Engineering; Lighting; Heating | 21 | Expired |
| US5794693A | Dual tubing string hanging apparatus | Fixed Constructions | 19 | Expired |
| US5383519A | Apparatus for rotating a tubing string of a pumping wellhead | Fixed Constructions | 16 | Expired |
| US6199630A | Pull-through tubing string rotator for an oil well | Fixed Constructions | 15 | Expired |
| US8056621B2 | Master ball valve with integrated hanger | Fixed Constructions | 14 | Active |
| US10508526B2 | Fracing plug | Fixed Constructions | 11 | Active |
| US5746249A | Oil well blow-out preventer and sealing device | Emerging Cross-Sectional Technologies | 10 | Expired |
| US4480963A | Pump swashplate control assist | Mechanical Engineering; Lighting; Heating | 6 | Expired |
| US4658917A | Enclosed jar tool | Fixed Constructions | 6 | Expired |
| US4518319A | Variable displacement pump system | Emerging Cross-Sectional Technologies | 4 | Expired |
| US3995973A | Variable displacement hydraulic system | Mechanical Engineering; Lighting; Heating | 4 | Expired |
| US9638003B2 | Sleeve valve | Fixed Constructions | 4 | Active |
| US4057005A | Dual flow hydraulic system and control valve therefor | Emerging Cross-Sectional Technologies | 2 | Expired |
| US10851616B2 | Wireline suspendable apparatus for sealing a subterranean well | Fixed Constructions | 2 | Active |
| US11499400B2 | Punch mechanism | Fixed Constructions | 1 | Active |
| US11384621B2 | Automatic flow control valve | Fixed Constructions | 1 | Active |
| US11162345B2 | Fracing plug | Fixed Constructions | 1 | Active |
| US9617823B2 | Axially compressed and radially pressed seal | Fixed Constructions | 1 | Active |
| US9689236B2 | Liner hanger | Fixed Constructions | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.