Raphael L. Levien
32Patents
12h-index
4Co-inventors
74Inventor score
Filing activity: Jun 22, 1982 → Jul 8, 2016
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5218386A | Eyeglasses with spectral color shift | Electricity | 92 | Expired |
| US5544258A | Automatic tone correction of images using non-linear histogram processing | Physics | 87 | Expired |
| US4523271A | Software protection method and apparatus | Physics | 51 | Expired |
| US5055942A | Photographic image reproduction device using digital halftoning to screen images allowing adjustable coarseness | Electricity | 32 | Expired |
| US5388517A | Method and apparatus for automatic alignment of objects and register mark for use therewith | Physics | 29 | Expired |
| US6097855A | Method and apparatus for image rotation | Electricity | 28 | Expired |
| US5155588A | Color correction and apparatus for photographic reproduction | Electricity | 26 | Expired |
| US5442461A | Screen generation for halftone screening of images with reduction of irrational correction artifacts | Electricity | 24 | Expired |
| US5524162A | Method and apparatus for adaptive sharpening of images | Physics | 24 | Expired |
| US5276535A | Method and apparatus for halftoning of images using grayscale error diffusion | Electricity | 22 | Expired |
| US5917614A | Method and apparatus for error diffusion screening of images with improved smoothness in highlight and shadow regions | Electricity | 20 | Expired |
| US5337264A | Time reversal gaussian approximation filter | Electricity | 17 | Expired |
| US5402726A | Register mark | Physics | 12 | Expired |
| US5291310A | Screen generation for halftone screening of images | Electricity | 12 | Expired |
| US5315406A | Screen generation for halftone screening of images using arbitrary distribution of transformed screen coordinates | Electricity | 12 | Expired |
| US5331429A | Digital generation of halftone images with error diffusion and frequency matched periodic screen rulings | Electricity | 11 | Expired |
| US5307181A | Screen generation for halftone screening of images using scan line segments of oversized screen scan lines | Electricity | 10 | Expired |
| US5404137A | High speed transition signalling communication system | Physics | 10 | Expired |
| US5991513A | Method and apparatus for suppressing moire patterns | Electricity | 6 | Expired |
| US5365602A | Integrated half-tone screening and enlarging using an enlargement mapping pattern having linked, unique pattern segments | Electricity | 6 | Expired |
| US8810579B2 | Method and apparatus for interactive curve generation | Physics | 1 | Active |
| US8843455B2 | System and method of font compression using selectable entropy encoding | Physics | 1 | Active |
| US9098524B2 | System and method of font compression using selectable entropy encoding | Physics | 0 | Active |
| US9275018B2 | Techniques for analyzing web pages to determine font subsets | Physics | 0 | Active |
| US8510531B1 | Fast, dynamic cache packing | Physics | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.