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William Phillips Thompson
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Publication of GB190819659ApublicationCriticalpatent/GB190819659A/en
19,659. Thompson, W. P., [Inwald, 0. von, and Inwald, R. von]. Sept. 18, Carbon and charcoal. - Electric - lamp filaments containing carbon are heated by an electric current passed through them and are simultaneously compressed to consolidate and sinter them and to reduce their electric resistance ; the carbon is converted into graphite by this treatment. Preferably the filaments are enclosed in a vessel which can be filled with a gas under a high pressure.
GB190819659D1908-09-181908-09-18Improved Process for Making Incandescent Filaments for Electric Lamps.
ExpiredGB190819659A
(en)
Improvements in and relating to the Manufacture of Filaments or Coherent Conductors of Refractory Material suitable for Incandescent Electric Lamps and the like.