Robert Sprague
15Patents
5h-index
3Co-inventors
59Inventor score
Filing activity: Oct 27, 1983 → Jun 8, 2022
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4650423A | Method of teaching and transcribing of language through the use of a periodic code of language elements | Physics | 18 | Expired |
| US4768959A | Method of teaching and transcribing of language through the use of a periodic code of language elements | Physics | 11 | Expired |
| US4795349A | Coded font keyboard apparatus | Physics | 10 | Expired |
| US4515566A | Flip card apparatus for forming units of speech | Physics | 9 | Expired |
| US9989684B2 | Near infrared optical interference filters with improved transmission | Performing Operations; Transporting | 7 | Active |
| US10437042B2 | Enhancement of output of optically pumped phosphor by use of surface nanostructures | Physics | 3 | Active |
| US9927369B2 | Automated defect detection and mapping for optical filters | Physics | 1 | Active |
| US11372144B2 | Near infrared optical interference filters with improved transmission | Physics | 1 | Active |
| US9804310B2 | Method of fabricating anisotropic optical interference filter | Physics | 1 | Active |
| US10871644B2 | Enhancement of output of optically pumped phosphor by use of surface nanostructures | Physics | 1 | Active |
| US10502880B2 | Method of fabricating anisotropic optical interference filter | Physics | 1 | Active |
| US12000033B2 | Method of fabricating anisotropic optical interference filter | Physics | 0 | Active |
| US12422605B2 | Near infrared optical interference filters with improved transmission | Physics | 0 | Active |
| US11365471B2 | Method of fabricating anisotropic optical interference filter | Physics | 0 | Active |
| US11474422B2 | Reflective color correction for phosphor illumination systems | Physics | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.