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| Patents for C09B 11 - Diaryl- or triarylmethane dyes (2,007) |
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| 03/23/1976 | US3946017 Lactones of the benzaxanthere series and dye-forming components for use in duplication processes | | 03/09/1976 | US3942946 Black dyeing of acid-modified polyester fiber | | 02/03/1976 | US3936564 Pressure-sensitive copying paper containing lactone compounds of pyridine-carboxylic acid | | 01/27/1976 | US3934974 Solution of ethylauramine hydrochloride in thiodiglycol | | 01/06/1976 | US3931182 Lactones of the diazaxanthene series, their production and their use as dye-forming components for copying methods | | 01/06/1976 | US3930672 Pressure-sensitive copying paper containing lactone compounds derived from pyridine-carboxylic acid | | 01/06/1976 | US3930671 Color former and pressure-sensitive copying paper |
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