Ralph A. Logan
21Patents
11h-index
14Co-inventors
68Inventor score
Filing activity: Jun 20, 1974 → Aug 7, 1990
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4093345A | Semiconductor rib waveguide optical modulator with heterojunction control electrode cladding | Physics | 50 | Expired |
| US3978426A | Heterostructure devices including tapered optical couplers | Emerging Cross-Sectional Technologies | 38 | Expired |
| US4136928A | Optical integrated circuit including junction laser with oblique mirror | Electricity | 34 | Expired |
| US3993963A | Heterostructure devices, a light guiding layer having contiguous zones of different thickness and bandgap and method of making same | Electricity | 34 | Expired |
| US5040186A | InP-based quantum-well laser | Electricity | 20 | Expired |
| US4159452A | Dual beam double cavity heterostructure laser with branching output waveguides | Electricity | 19 | Expired |
| US4575919A | Method of making heteroepitaxial ridge overgrown laser | Emerging Cross-Sectional Technologies | 19 | Expired |
| US4390889A | Photodiode having an InGaAs layer with an adjacent InGaAsP p-n junction | Electricity | 17 | Expired |
| US4269635A | Strip buried heterostructure laser | Emerging Cross-Sectional Technologies | 13 | Expired |
| US4190813A | Strip buried heterostructure laser | Electricity | 13 | Expired |
| US4226667A | Oxide masking of gallium arsenide | Emerging Cross-Sectional Technologies | 12 | Expired |
| US4169997A | Lateral current confinement in junction lasers | Electricity | 11 | Expired |
| US3935472A | Thin film liquid waveguide optical converter | Physics | 10 | Expired |
| US4464211A | Method for selective area growth by liquid phase epitaxy | Electricity | 10 | Expired |
| US4701995A | Method of making a nonplanar buried-heterostructure distributed-feedback laser | Electricity | 9 | Expired |
| US4953170A | Method for forming a heteroepitaxial structure, and a device manufactured thereby | Electricity | 8 | Expired |
| US4028146A | LPE Technique for fabricating tapered optical couplers | Emerging Cross-Sectional Technologies | 8 | Expired |
| US4627065A | Double active layer semiconductor laser | Electricity | 6 | Expired |
| US4194933A | Method for fabricating junction lasers having lateral current confinement | Electricity | 6 | Expired |
| US4481631A | Loss stabilized buried heterostructure laser | Electricity | 4 | Expired |
| US4536940A | Method of making a loss stabilized buried heterostructure laser | Emerging Cross-Sectional Technologies | 4 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.