John D. Fergason
25Patents
16h-index
3Co-inventors
74Inventor score
Filing activity: Dec 7, 1989 → May 29, 2015
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US7347551B2 | Optical system for monitoring eye movement | Human Necessities | 214 | Expired |
| US5208688A | Eye protection device for welding helmets | Physics | 164 | Expired |
| US5751258A | Liquid crystal lens driver electronics for eye protection, high speed shuttering with consistent performance | Physics | 116 | Expired |
| US7342210B2 | Remote control for auto-darkening lens systems and method | Human Necessities | 113 | Expired |
| US7150047B2 | Indicator layout on an auto-darkening lens for use in welding | Human Necessities | 83 | Expired |
| US5074647A | Liquid crystal lens assembly for eye protection | Human Necessities | 82 | Expired |
| US5377032A | Electro-optic light shutter and frame assembly with integrated switching mechanism | Human Necessities | 68 | Expired |
| US5515186A | Eye protection device for welding helmets which reduces obliquely incident light | Physics | 65 | Expired |
| US5857215A | Helmet with high performance head and face protection utilizing molded composite materials and method | Performing Operations; Transporting | 50 | Expired |
| US5959705A | Welding lens with integrated display, switching mechanism and method | Performing Operations; Transporting | 50 | Expired |
| US5248880A | Detector system for detecting the occurrence of welding | Physics | 47 | Expired |
| US6554428B2 | Method and apparatus for adjusting optical device to correspond to eye positions | Physics | 42 | Expired |
| US6067129A | Welding lens with integrated display and method | Performing Operations; Transporting | 42 | Expired |
| US5252817A | Detector system for detecting the occurrence of welding using detector feedback | Physics | 39 | Expired |
| US5347383A | High speed, low power driving circuit for liquid crystal shutter | Physics | 23 | Expired |
| US7501613B2 | Light detecting and angle of view compensation for optical devices and method | Physics | 20 | Expired |
| US7161135B2 | Multi-stage sensor for an auto-darkening lens for use in welding and method | Performing Operations; Transporting | 14 | Expired |
| USD353692S | Welding lens assembly | General | 11 | Expired |
| US7553021B2 | Optical system for monitoring eye movement | Human Necessities | 10 | Active |
| US7550698B2 | Light sensor arrangement for auto-darkening lenses and method | Human Necessities | 9 | Expired |
| US9867737B2 | Auto-darkening filter of welding shield | Physics | 1 | Active |
| US9244279B1 | Glasses-type augmented reality display system | Physics | 0 | Active |
| US8954885B2 | Display system using metadata to adjust area of interest and method | Electricity | 0 | Active |
| US9443479B2 | Image acquisition and display system and method using information derived from an area of interest in a video image implementing system synchronized brightness control and use of metadata | Physics | 0 | Active |
| US9218770B2 | Apparatus, method and system to enhance legibility of images shown on a passive display in a bright environment by increasing or maintaining a range of grey levels and decreasing a number of grey levels in that range | Physics | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.