| 摘要 |
<p>630,785. Dry contact rectifiers. STANDARD TELEPHONES & CABLES, Ltd. Sept. 27, 1946, No. 28958. Convention date, Oct. 26, 1945. [Class 37] The barrier layer of a selenium rectifier comprises cadmium selenide deposited by evaporation from a volatile carrier medium such as varnish or lacquer. In addition to varnish or lacquer the volatile medium may include an alcohol solution in concentrations varying from ¢ to 20 per cent, a solution of 5 per cent cellulose acetate in methyl ethylene glycol mono-methyl ether acetate, and methyl ethylene glycol mono-methyl ether acetate.</p> |
