Frederick O. Johnson
9Patents
6h-index
5Co-inventors
52Inventor score
Filing activity: Jun 19, 1975 → Apr 25, 1985
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4017744A | Digital firing pulse generator for thyristor power converters | Electricity | 21 | Expired |
| US4664247A | Conveyor brake control | Performing Operations; Transporting | 20 | Expired |
| US3991352A | Apparatus and method for reducing effective inductance in a dynamic braking circuit | Electricity | 17 | Expired |
| US4286315A | Converter apparatus | Emerging Cross-Sectional Technologies | 12 | Expired |
| US4575664A | Tachometer check apparatus | Emerging Cross-Sectional Technologies | 6 | Expired |
| US4277825A | Converter apparatus | Electricity | 6 | Expired |
| US4639851A | Method and apparatus for firing angle control of series connected thyristor switches | Electricity | 3 | Expired |
| US4325115A | Regulated DC power supply | Emerging Cross-Sectional Technologies | 2 | Expired |
| US4258829A | Elevator system | Performing Operations; Transporting | 2 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.