| 摘要 |
<p>529,791. Coating with selenium. WESTING- HOUSE BRAKE & SIGNAL CO.,' Ltd., and THOMPSON, L. E. May 26, 1939, No. 15716. [Class 82 (ii)] [Also in Group XXXVI] Selenium-containing material is distributed evenly over a base plate in powder form and heated preferably under pressure, to a temperature sufficient to soften it, but not to melt it. The selenium material may contain a small proportion of a non-volatile salt containing chlorine and is prepared by melting the selenium, adding selenium dioxide with any of the other substances, casting into sheets, breaking up and grinding to powder. Specification 529.792, [Group XXXVI], is referred to.</p> |
