| 摘要 |
<p>1,162,039. Method of applying noxious cleaning chemicals. W. R. GRACE & CO. 18 Oct., 1967 [17 Nov., 1966], No. 47506/67. Heading C5D. [Also in Division C7] A process for cleaning an open surface with noxious cleaning compositions containing eye, nose and skin irritants, comprising mixing a foamable cleaning composition containing noxious chemicals which may be alkalis, mineral acids, sulphamic acid or strongly basic amines, with at least 90 volume per cent of a gas and applying the resultant foam to the open surface to be cleaned, and rinsing the surface to remove the residual foamed cleaning composition.</p> |
