John Campbell
21Patents
12h-index
25Co-inventors
81Inventor score
Filing activity: Jan 14, 1974 → May 14, 2009
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US3953194A | Process for reclaiming cemented metal carbide | Chemistry; Metallurgy | 38 | Expired |
| US4380353A | Dust control system and method of operation | Fixed Constructions | 37 | Expired |
| US7539706B1 | Methods and apparatus for collecting and processing file system data | Emerging Cross-Sectional Technologies | 30 | Expired |
| US4113289A | Exhaust system and muffler lap joint | Mechanical Engineering; Lighting; Heating | 30 | Expired |
| US4200335A | Gauging apparatus and method, particularly for controlling mining by a mining machine | Fixed Constructions | 29 | Expired |
| US4969537A | Muffler assembly and method of manufacture | Mechanical Engineering; Lighting; Heating | 26 | Expired |
| USD340638S | Furniture leg shoe | General | 24 | Expired |
| US4629392A | System for batch loading coal into railroad cars | Performing Operations; Transporting | 23 | Expired |
| US4974284A | Picnic table caster assembly | Performing Operations; Transporting | 16 | Expired |
| US7478404B1 | System and methods for event impact analysis | Physics | 16 | Active |
| US4102550A | Mining method and apparatus | Fixed Constructions | 15 | Expired |
| US3997017A | Auxiliary hydrostatic front wheel drive system | Mechanical Engineering; Lighting; Heating | 14 | Expired |
| US6427321B2 | Automatic decking and automatic fastening system | Emerging Cross-Sectional Technologies | 10 | Expired |
| US7958095B1 | Methods and apparatus for collecting and processing file system data | Emerging Cross-Sectional Technologies | 9 | Active |
| US4173373A | Advance method and apparatus for mining | Fixed Constructions | 8 | Expired |
| US7296832B1 | Locking mechanism for door hinge | Emerging Cross-Sectional Technologies | 7 | Expired |
| US4904154A | Loading system for railroad cars | Physics | 7 | Expired |
| US6086311A | Handtruck with deflectable mandrel for locking inside the core of a reel or spool to be lifted and moved | Emerging Cross-Sectional Technologies | 7 | Expired |
| US4082360A | Mining apparatus and method | Fixed Constructions | 6 | Expired |
| US5452839A | Stud gun positioning apparatus | Performing Operations; Transporting | 3 | Expired |
| US4746498A | Process for reducing gaseous sulfur dioxide content of flue gases by preheating coals prior to burning such coals and by controlling combustion temperature levels | Mechanical Engineering; Lighting; Heating | 2 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.