| 摘要 |
1,226,915. Carbon paper &c. INTERNATIONAL BUSINESS MACHINES CORP. 24 July, 1969 [5 Aug., 1968], No. 37188/69. Addition to 1,226,683. Heading D2B. The pressure-sensitive transfer medium of the parent specification is modified by using as liquid-absorbing filler, in place of woodflour, gelatin, polyvinyl alcohol or a cellulosic material other than woodflour, e.g. cotton, methylcellulose, hydroxyethylcellulose or hydroxymethylcellulose. Media in which the fillers are the non-absorbent diatomaceous earth and an organic derivative of montmorillonite are described by way of comparison. |
