Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
Inventor
Denton Abel Charles
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Siemens and Halske AG
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Siemens and Halske AG
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Filing date
Publication date
Application filed by Siemens and Halske AGfiledCriticalSiemens and Halske AG
Application grantedgrantedCritical
Publication of GB190420277ApublicationCriticalpatent/GB190420277A/en
20,277. Abel, C. D., [Siemens & Halske Akt.-Ges.].' Sept. 20 Incandescent lamps, filaments for. Metals such as molybdenum, thorium, titanium, tungsten, or zirconium, or alloys of these or other difficultlyfusible metals, are used in the form of drawn wires, and free from all non-metallic admixtures. The metal is preferably fused before drawing by heating it electrically in a vacuum or inert atmosphere ; or the fused metal may be produced by heating the oxides or nitrogen or hydrogen compounds of the metal, or similar compounds, which dissociate on heating, the gaseous constituent being removed by exhaustion.
GB190420277D1904-09-201904-09-20Improved Manufacture of Incandescence Bodies for Electric Glow Lamps.
ExpiredGB190420277A
(en)
Improvements in the Manufacture of Incandescence Filaments for Electric Lamps from Metallic Thorium containing Oxide with or without Admixtures of other Difficulty Fusible Metals.