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Herbert John Haddan
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13,986. Haddan, H. J., [Bergmann Elektricitõts-Werke Akt.-Ges.]. June 17. Incandescent lamps.-In making filaments of metals with high melting-points, such as niobium, tantalum, molybdenum, tungsten, uranium, titanium, thorium, and zirconium, ammonium sulphide is used as a binding-agent to form the metals into a plastic mass, and is removed by passage of current through the filaments, preferably in a vacuum.
GB190713986D1907-06-171907-06-17Improvements in the Manufacture of Metallic Filaments for Electric Glow Lamps.
ExpiredGB190713986A
(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.