Richard Porterfield
11Patents
5h-index
13Co-inventors
63Inventor score
Filing activity: Aug 18, 1977 → Jan 30, 2019
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4735341A | Feeder for electrical component supply tapes | Electricity | 27 | Expired |
| US4887351A | Pick and place nozzle with concentric grooves | Emerging Cross-Sectional Technologies | 18 | Expired |
| US4769904A | Method and apparatus for handling leaded and leadless surface mountable components | Emerging Cross-Sectional Technologies | 8 | Expired |
| US5051555A | Hot-bar suspension system | Electricity | 8 | Expired |
| US4140407A | Ribbon feed mechanism responsive to case shaft mechanism and printing mechanism | Performing Operations; Transporting | 6 | Expired |
| US4838452A | Shutter system for electrical component supply tape feeder | Electricity | 3 | Expired |
| US4131374A | Dual segment continuous motion ribbon feed mechanism | Performing Operations; Transporting | 3 | Expired |
| US4543705A | Axial-lead component sequencing and inserting apparatus | Emerging Cross-Sectional Technologies | 2 | Expired |
| US5068509A | High frequency thermode driven device employing one-turn-secondary transformers | Performing Operations; Transporting | 1 | Expired |
| US10697585B1 | Fluid dispensing apparatus for dispensing oil or grease | Mechanical Engineering; Lighting; Heating | 1 | Active |
| USRE35180E | High frequency thermode driven device employing one-turn-secondary transformers | General | 1 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.