Electric lamp and discharge devices – With support and/or spacing structure for electrode and/or... – For plural electrodes of discharge device
Patent
1978-12-26
1981-03-17
Demeo, Palmer C.
Electric lamp and discharge devices
With support and/or spacing structure for electrode and/or...
For plural electrodes of discharge device
313222, H01K 132, H01K 150
Patent
active
042569885
ABSTRACT:
The invention relates to electric incandescent lamps having a gas fill containing halogen. The internal surface of the lamp envelope and optionally also the exposed surface of internal components of the lamp are protected from attack by halogens including fluorine by a continuous imperforate coating composed of a metal oxide resistant to halogen attack. In order to achieve the necessary degree of continuity of the coating the oxide is formed in situ from a compound of the metal deposited as a solution on the surface. The preferred oxide is alumina, the other oxides of polyvalent and transition metals, including metals of the lanthanide series may be used. The coatings are preferably formed from solutions of halides of the metals in polar organic solvents such as methanol. The invention prolongs the life of lamps provided with the protective coating and enable such resistant and possibly cheaper materials to be employed for certain lamp components.
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Coaton James R.
Rees John M.
Rothon Roger N.
DeMeo Palmer C.
Imperial Chemical Industries Limited
O'Connell Robert F.
Thorn Lighting Limited
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