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| Number | Title | Issue Date |
| 4084183 | Method for the electro-optical reproduction of half-tone pictures A method for the electro-optical reproduction of half-tone pictures in which the picture is subdivided into surface elements having covering spots therein corresponding to a tone value scale, wherein electronic recording data is produced from the surface ... | 04/11/1978 |
| 4081828 | Method for halftone reproduction of continuous tone images A method for halftone reproduction of continuous tone images, in black and white or color, wherein improved tonal density characteristics are achieved, is disclosed. By plotting a first set of dot fields upon a recording medium, such as photographic film,... | 03/28/1978 |
| 3997911 | Screened image reproduction In the reproduction of a half-tone image, x and y pulse trains are generated in synchronism with the production of image-representing signals resulting from scanning the image to be reproduced; the x pulse train is multiplied in frequency by first and sec... | 12/14/1976 |
