| 摘要 |
496,404. Electric lamps. GENERAL ELECTRIC CO., Ltd. (Patent-Treuhand-Ges. fur Elektrische Gl³hlampen) June 4, 1937, No. 15538. [Class 39 (i)] [Also in Group XI] In lamps of the kind in which the envelope is mainly covered by an opaque covering with a restricted window for producing a narrow beam of light, the envelope is flattened or recessed at the window 11, Figs. 2 and 3, and the opaque layer 12 is extended so as to cover the edge of the flattened or recessed portion. The source of light may be an incandescent filament or a glow discharge between interlacing helical electrodes. Specifications 2843/14, [Class 39 (ii)], and 421,674, [Group I], are referred to. |
