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
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens and Halske AG
Siemens AG
Original Assignee
Siemens and Halske AG
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens and Halske AG, Siemens AGfiledCriticalSiemens and Halske AG
Application grantedgrantedCritical
Publication of GB190811524ApublicationCriticalpatent/GB190811524A/en
11,524. Siemens &. Halske Akt.-Ges. June 8, 1907, [date applied for under Section 91 of Patents &c. Act, 1907]. Incandescent lamps.-Crude tungsten or other metallic filaments are decarbonized by heating them electrically in acetic acid vapour. The filaments may be placed in an air-pump receiver, which either contains a dish of the glacial acid or communicates with a separate vessel containing it ; the receiver is then exhausted and the acid volatilizes.
GB190811524D1907-06-081908-05-27Improved Manufacture of Metal Electric Lamp Filaments Free from Carbon.
ExpiredGB190811524A
(en)