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 - Lifetime
Application number
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Siemens and Halske AG
Siemens AG
Original Assignee
Siemens and Halske AG
Siemens AG
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Filing date
Publication of GB190722747ApublicationCriticalpatent/GB190722747A/en
Application filed by Siemens and Halske AG, Siemens AGfiledCriticalSiemens and Halske AG
22,747. Siemens & Halske Akt.-Ges. Oct. 26,1906, [date applied for under Patents Act, 1901]. Void. [Published under Patents &c. Act, 1907.] Wire; drawing; rolling; squirting; working by unclassified operations.-Refractory metals difficult to work are made into electric-lamp filaments by embedding the powdered metal in a very ductile metal and working the two together ; the ductile metal may then be removed, or, if sufficiently refractory, like thorium or an alloy thereof, allowed to remain in the filaments. The mixture may be brought to filament form by rolling, drawing, pressing, squirting, or the like, and the ductile metal may be removed by mechanical or chemical means or by volatilization, for example by passage of an electric current.
GB190722747D1906-10-261907-10-15Improved Manufacture of Incandescence Filaments for Electric Light from Difficultly Fusible Metals.
Expired - LifetimeGB190722747A
(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.