Electric lamp and discharge devices – With gas or vapor – Envelope with particular structure
Patent
1994-12-22
1996-09-17
Patel, Nimeshkumar D.
Electric lamp and discharge devices
With gas or vapor
Envelope with particular structure
313110, 445 26, 445 58, 445 59, H01J 920, H01J 6135
Patent
active
055571700
ABSTRACT:
An electric lamp has a tubular discharge vessel or a lamp envelope with an optically active layer of a material at an inner surface. The optically active layer has window in which the layer is absent. The material of the optically active layer adjacent both to the window and to the wall of the discharge vessel has a form different from that of portions of the optically active layer not adjoining the window as a result of fusion. The lamp may be readily manufactured by a method according to the invention whereby the material situated within the window to be formed is removed by intensive electromagnetic radiation which is directed through the wall of the discharge vessel at the material to be removed.
REFERENCES:
patent: 3717781 (1973-02-01), Sadoski et al.
patent: 3875454 (1975-04-01), Van Der Wolf et al.
patent: 4080545 (1978-03-01), Gallo
Patel Nimeshkumar D.
U.S. Philips Corporation
Wieghaus Brian J.
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