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
GB1031460A
Inventor
Evan Herbert Nelson
Sydney Alfred Richard Rigden
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.)
General Electric Co PLC
Original Assignee
General Electric Co PLC
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 General Electric Co PLCfiledCriticalGeneral Electric Co PLC
Priority to GB1031460ApriorityCriticalpatent/GB998583A/en
Publication of GB998583ApublicationCriticalpatent/GB998583A/en
The envelope of a sodium vapour-rare gas discharge lamp is formed of a glass having the percentage composition B2O3-25.0, K2O-5.5, CaO-9.0, BaO-36.0, and Al2O3-24.5, for sodium vapour pressures up to about 0.1 mm. For sodium vapour pressures exceeding 0.1 mm. the envelope can be formed of sintered high density polycrystalline alumina. Specifications 801,482 and 998,584 are referred to.
GB1031460A1960-03-231960-03-23Improvements in or relating to sodium vapour electric discharge lamps
ExpiredGB998583A
(en)