Julius P. Perr
52Patents
20h-index
61Co-inventors
91Inventor score
Filing activity: Jul 2, 1973 → Aug 8, 2003
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5404855A | Variable displacement high pressure pump for fuel injection systems | Mechanical Engineering; Lighting; Heating | 64 | Expired |
| US5899389A | Two stage fuel injector nozzle assembly | Mechanical Engineering; Lighting; Heating | 61 | Expired |
| US5441027A | Individual timing and injection fuel metering system | Mechanical Engineering; Lighting; Heating | 57 | Expired |
| US5983863A | Compact high performance fuel system with accumulator | Mechanical Engineering; Lighting; Heating | 54 | Expired |
| US6336598B1 | Gaseous and liquid fuel injector with a two way hydraulic fluid control valve | Emerging Cross-Sectional Technologies | 49 | Expired |
| US5979803A | Fuel injector with pressure balanced needle valve | Mechanical Engineering; Lighting; Heating | 48 | Expired |
| US5419492A | Force balanced electronically controlled fuel injector | Mechanical Engineering; Lighting; Heating | 44 | Expired |
| US5329908A | Compressed natural gas injection system for gaseous fueled engines | Emerging Cross-Sectional Technologies | 38 | Expired |
| US5042445A | Electronic controlled fuel supply system for high pressure injector | Emerging Cross-Sectional Technologies | 37 | Expired |
| US5619969A | Fuel injection rate shaping control system | Mechanical Engineering; Lighting; Heating | 32 | Expired |
| US5002022A | Valve control system with a variable timing hydraulic link | Mechanical Engineering; Lighting; Heating | 31 | Expired |
| US4249499A | Timing mechanism for a fuel supply system | Mechanical Engineering; Lighting; Heating | 31 | Expired |
| US3951117A | Fuel supply system for an internal combustion engine | Mechanical Engineering; Lighting; Heating | 30 | Expired |
| US4062332A | Compression brake for internal combustion engine | Mechanical Engineering; Lighting; Heating | 26 | Expired |
| US6557779B2 | Variable spray hole fuel injector with dual actuators | Mechanical Engineering; Lighting; Heating | 25 | Expired |
| US4909197A | Cam follower assembly with pinless roller | Emerging Cross-Sectional Technologies | 25 | Expired |
| US4911127A | Fuel injector for an internal combustion engine | Mechanical Engineering; Lighting; Heating | 23 | Expired |
| US5033442A | Fuel injector with multiple variable timing | Emerging Cross-Sectional Technologies | 23 | Expired |
| US4463901A | Unit fuel injector having independently controlled timing and metering | Mechanical Engineering; Lighting; Heating | 23 | Expired |
| US4206734A | Adjustable timing mechanism for fuel injection system | Mechanical Engineering; Lighting; Heating | 21 | Expired |
| US5765755A | Injection rate shaping nozzle assembly for a fuel injector | Mechanical Engineering; Lighting; Heating | 20 | Expired |
| US5029568A | Injection rate control injector | Emerging Cross-Sectional Technologies | 20 | Expired |
| US4721247A | High pressure unit fuel injector | Mechanical Engineering; Lighting; Heating | 19 | Expired |
| US4471909A | Miniaturized unit fuel injector | Emerging Cross-Sectional Technologies | 19 | Expired |
| US5076236A | Fuel cutoff for better transient control | Mechanical Engineering; Lighting; Heating | 18 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.