Ralph H. Johnson
99Patents
12h-index
46Co-inventors
84Inventor score
Filing activity: Jul 27, 1990 → Oct 25, 2022
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6411638B1 | Coupled cavity anti-guided vertical-cavity surface-emitting laser | Electricity | 54 | Expired |
| US5903588A | Laser with a selectively changed current confining layer | Electricity | 54 | Expired |
| US5940422A | Laser with an improved mode control | Electricity | 53 | Expired |
| US7031363B2 | Long wavelength VCSEL device processing | Electricity | 34 | Expired |
| US6064683A | Bandgap isolated light emitter | Electricity | 31 | Expired |
| US7095770B2 | Vertical cavity surface emitting laser including indium, antimony and nitrogen in the active region | Electricity | 29 | Expired |
| US7255746B2 | Nitrogen sources for molecular beam epitaxy | Electricity | 18 | Expired |
| US5156052A | Ribbed and bossed pressure transducer | Emerging Cross-Sectional Technologies | 18 | Expired |
| US6798806B1 | Hybrid mirror VCSELs | Electricity | 15 | Expired |
| US6813293B2 | Long wavelength VCSEL with tunnel junction, and implant | Electricity | 14 | Expired |
| US6603784B1 | Mechanical stabilization of lattice mismatched quantum wells | Electricity | 13 | Expired |
| US5174156A | Pressure transducer with reduced offset signal | Physics | 13 | Expired |
| US6965626B2 | Single mode VCSEL | Electricity | 12 | Expired |
| US6990135B2 | Distributed bragg reflector for optoelectronic device | Electricity | 11 | Expired |
| US7346090B2 | Vertical cavity surface emitting laser including trench and proton implant isolation | Electricity | 11 | Active |
| US5264715A | Emitting with structures located at positions which prevent certain disadvantageous modes and enhance generation of light in advantageous modes | Electricity | 10 | Expired |
| US7221691B2 | Versatile method and system for single mode VCSELs | Electricity | 10 | Expired |
| US6905900B1 | Versatile method and system for single mode VCSELs | Electricity | 9 | Expired |
| US7826506B2 | Vertical cavity surface emitting laser having multiple top-side contacts | Electricity | 9 | Active |
| US7251264B2 | Distributed bragg reflector for optoelectronic device | Electricity | 8 | Expired |
| US6975660B2 | Vertical cavity surface emitting laser including indium and antimony in the active region | Electricity | 7 | Expired |
| US9606598B2 | Automatic tuning for a memory voltage regulator | Emerging Cross-Sectional Technologies | 7 | Active |
| US8031752B1 | VCSEL optimized for high speed data | Electricity | 7 | Active |
| US8837547B2 | Lasers with InGaAs quantum wells with InGaP barrier layers with reduced decomposition | Electricity | 6 | Active |
| US6256333A | VCSEL structure insensitive to mobile hydrogen | Electricity | 6 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.