Duane R. Johnson
23Patents
9h-index
23Co-inventors
75Inventor score
Filing activity: Mar 9, 1983 → Jun 22, 2011
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4790208A | Knob and shaft assembly | Emerging Cross-Sectional Technologies | 25 | Expired |
| US5365791A | Signal generator | Emerging Cross-Sectional Technologies | 24 | Expired |
| US5439275A | Signal generator | Emerging Cross-Sectional Technologies | 21 | Expired |
| US6863544B2 | Remote diagnostic unit enclosure assembly | Electricity | 18 | Expired |
| US5458676A | Pressure differential control valve for compressed air system | Performing Operations; Transporting | 17 | Expired |
| US6909408B2 | Mounting assembly for night vision display unit | Performing Operations; Transporting | 16 | Expired |
| US5762094A | Automatic valve drain | Emerging Cross-Sectional Technologies | 15 | Expired |
| US5080133A | Control valve assembly | Emerging Cross-Sectional Technologies | 12 | Expired |
| US5261458A | Pilot relay valve with load piston | Emerging Cross-Sectional Technologies | 9 | Expired |
| US4979783A | Parking brake control valve dual actuating device | Emerging Cross-Sectional Technologies | 9 | Expired |
| US4875563A | Shift lever activated parking brake | Emerging Cross-Sectional Technologies | 7 | Expired |
| US6254048A | Solenoid clamp | Performing Operations; Transporting | 7 | Expired |
| US5666995A | Pilot relay valve including means to control flow through a balance orifice | Emerging Cross-Sectional Technologies | 6 | Expired |
| US4515258A | Clutch drive with link spring | Mechanical Engineering; Lighting; Heating | 4 | Expired |
| US7325463B2 | Fluid sensor assembly | Physics | 3 | Expired |
| US4729607A | Dual circuit brake valve differential pressure control mechanism | Emerging Cross-Sectional Technologies | 3 | Expired |
| US4691968A | Dual circuit brake valve | Emerging Cross-Sectional Technologies | 3 | Expired |
| US7355628B2 | Method and apparatus of maintaining a video signal through brief interruptions of a related control signal | Electricity | 3 | Expired |
| US4923254A | Hydraulic parking brake control system | Performing Operations; Transporting | 2 | Expired |
| US8550426B2 | Two step park brake release | Performing Operations; Transporting | 2 | Active |
| US8539825B2 | Adjustable simulator apparatus and method for testing vehicle components | Physics | 1 | Active |
| US7247805B2 | Switch actuation method and mechanism | Electricity | 0 | Expired |
| US8499663B2 | Brake pedal stop | Emerging Cross-Sectional Technologies | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.