| 摘要 |
<p>1,264,936. Pressure-sensitive copying paper. FUJI PHOTO FILM CO. Ltd. 22 June, 1970 [27 June, 1969], No. 30232/70. Heading D2B. [Also in Division C4] Fluoran colour formers of the general formula wherein R 1 and R 2 are C 1 -C 5 alkyl, R 3 is acyl and R 4 an aryl group are used in pressuresensitive copying paper, optionally in admixture with at least one other known colour former.</p> |
