David Cain
43Patents
11h-index
51Co-inventors
78Inventor score
Filing activity: Nov 19, 1979 → Sep 27, 2018
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5775422A | Tree test plug | Fixed Constructions | 108 | Expired |
| US5791657A | Seals containing composite non-extrusion springs | Fixed Constructions | 36 | Expired |
| US6510895B1 | Energized sealing cartridge for annulus sealing between tubular well components | Fixed Constructions | 34 | Expired |
| US5996695A | Method and apparatus for sealing between casing and wellhead connector structure | Fixed Constructions | 33 | Expired |
| US4299118A | Viscometer | Physics | 30 | Expired |
| US5031695A | Well casing hanger with wide temperature range seal | Fixed Constructions | 28 | Expired |
| US6401747B1 | Gate valve | Emerging Cross-Sectional Technologies | 22 | Expired |
| US5782297A | Retrieval tool for back pressure valve and tree test plug | Fixed Constructions | 19 | Expired |
| US6918574B2 | Reduced torque gate valve with roller screw | Mechanical Engineering; Lighting; Heating | 18 | Expired |
| US5755287A | Sealing assembly for subsea wellheads | Fixed Constructions | 13 | Expired |
| US4397177A | Hydraulic filter press | Performing Operations; Transporting | 11 | Expired |
| US8196649B2 | Thru diverter wellhead with direct connecting downhole control | Fixed Constructions | 11 | Active |
| US4374474A | Pressurized density measuring apparatus | Physics | 11 | Expired |
| US5474124A | Wellhead retrieval tool assembly | Fixed Constructions | 10 | Expired |
| USD271570S | High temperature, high pressure filter press for testing drilling fluids or similar apparatus | General | 10 | Expired |
| US8960307B2 | Wellhead system with gasket seal | Fixed Constructions | 10 | Active |
| US9187973B2 | Offshore well system with a subsea pressure control system movable with a remotely operated vehicle | Fixed Constructions | 9 | Active |
| US7992840B2 | Pressure rated oil field gate valve | Mechanical Engineering; Lighting; Heating | 8 | Active |
| US5730218A | Tool protection guide with energy absorbing bumper | Fixed Constructions | 8 | Expired |
| US8157006B2 | Telescopic fracturing isolation sleeve | Fixed Constructions | 7 | Active |
| US4848777A | Pressure energized/pressure intensified casing seal | Emerging Cross-Sectional Technologies | 7 | Expired |
| US6520207B2 | Combination poppet and gate valve | Emerging Cross-Sectional Technologies | 6 | Expired |
| USD270718S | Field hand pump for use in the measuring of properties of drilling mud, or the like | General | 6 | Expired |
| US6923423B2 | Small bore gate valve | Fixed Constructions | 5 | Expired |
| US5896925A | Tool protection guide | Fixed Constructions | 4 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.