Clarence W. Johnson
22Patents
12h-index
2Co-inventors
71Inventor score
Filing activity: Mar 8, 1979 → Feb 27, 2018
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US8302796B1 | Utility box anti-theft lock brackets | Electricity | 48 | Active |
| US5224898A | Cushion connector | Fixed Constructions | 31 | Expired |
| US6015134A | Pneumatic actuator assembly | Emerging Cross-Sectional Technologies | 28 | Expired |
| US5464040A | Safety valve actuator | Emerging Cross-Sectional Technologies | 17 | Expired |
| US4844466A | Block puzzle | Human Necessities | 15 | Expired |
| US6116268A | Wellhead safety valve control system | Emerging Cross-Sectional Technologies | 13 | Expired |
| US4593914A | Wellhead sealing system | Emerging Cross-Sectional Technologies | 13 | Expired |
| US4494778A | Casing hanger | Fixed Constructions | 13 | Expired |
| US4759738A | Floating cushion sub | Fixed Constructions | 12 | Expired |
| US4703812A | Mobile drilling apparatus | Fixed Constructions | 12 | Expired |
| US5971353A | Dump/stop valve for surface controlled subsurface safety valve | Emerging Cross-Sectional Technologies | 12 | Expired |
| US6412510B1 | Wellhead safety valve control system | Emerging Cross-Sectional Technologies | 12 | Expired |
| US4784392A | Block puzzle | Human Necessities | 11 | Expired |
| US5341837A | Two line pilot valve | Emerging Cross-Sectional Technologies | 9 | Expired |
| US5791285A | Automatic aquatic food and water delivery device | Emerging Cross-Sectional Technologies | 7 | Expired |
| US5291918A | Safety valve actuator assembly | Emerging Cross-Sectional Technologies | 7 | Expired |
| US5070900A | Safety valve actuator assembly | Emerging Cross-Sectional Technologies | 7 | Expired |
| US4268988A | """2"" in ""1"" Bobber super and regular" | Human Necessities | 6 | Expired |
| US4287776A | Force transducer | Physics | 4 | Expired |
| US5590685A | High-low indicator | Emerging Cross-Sectional Technologies | 3 | Expired |
| US10716297B2 | Automatic fish feeder | Emerging Cross-Sectional Technologies | 1 | Active |
| US6053711A | Pump for pressurizing control system | Mechanical Engineering; Lighting; Heating | 1 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.