John W. Campbell
20Patents
7h-index
17Co-inventors
66Inventor score
Filing activity: May 20, 1977 → Dec 10, 2018
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4328594A | Prosthetic foot | Human Necessities | 81 | Expired |
| US5969237A | Measurement and control of asphaltene agglomeration in hydrocarbon Liquids | Physics | 50 | Expired |
| US4891508A | Precision infrared position detector apparatus for touch screen system | Physics | 32 | Expired |
| US4357907A | Fluidized bed combustor with improved indirect heat exchanger units | Performing Operations; Transporting | 10 | Expired |
| US5054727A | Rapid racker | Performing Operations; Transporting | 9 | Expired |
| US4512412A | Swinging fire apparatus pump operator panel | Human Necessities | 8 | Expired |
| US4920686A | Side stepper worms with rattle and sinker | Human Necessities | 8 | Expired |
| US6945096B1 | Measurement and control of asphaltene agglomeration in hydrocarbon liquids | Physics | 7 | Expired |
| US4377072A | Ceramic heat exchange module and apparatus and process utilizing same | Mechanical Engineering; Lighting; Heating | 7 | Expired |
| US4214398A | Fishhook | Human Necessities | 7 | Expired |
| US4387577A | Boilers | Mechanical Engineering; Lighting; Heating | 7 | Expired |
| US9267413B2 | Exhaust system for an agricultural vehicle | Emerging Cross-Sectional Technologies | 5 | Active |
| US4873783A | Side stepper worms with hook pocket | Human Necessities | 5 | Expired |
| US4862628A | Side stepper worms | Human Necessities | 2 | Expired |
| US6687660B2 | Hydrocarbon reservoir testing | Fixed Constructions | 2 | Expired |
| US4612958A | Boiler safety valve installations | Emerging Cross-Sectional Technologies | 1 | Expired |
| US4129098A | Fluidized beds | Mechanical Engineering; Lighting; Heating | 1 | Expired |
| US11866609B2 | Optically clear adhesives containing a trialkyl borane complex initiator and photoacid | Performing Operations; Transporting | 0 | Active |
| US7935251B2 | Waste treatment apparatus | Chemistry; Metallurgy | 0 | Active |
| US7794597B2 | Treatment of waste mixture containing liquids and solids | Chemistry; Metallurgy | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.