Lamp having opaque coating

Details Lamp having opaque coating Lamp having opaque coating

1979-11-23

1981-09-08

Demeo, Palmer C.

Electric lamp and discharge devices

With optical device or special ray transmissive envelope

Light valve or obscuring means

427106, 313221, 501 21, 501 53, 501141, H01K 132

Patent

active

042887135

ABSTRACT:
An incandescent lamp has on a portion of the lamp envelope a dark coating comprising manganese dioxide and aluminum phosphate.

REFERENCES:
patent: 1691832 (1928-11-01), Sweet
patent: 2840490 (1958-06-01), Collins et al.
patent: 2946697 (1960-07-01), Petro
patent: 3108885 (1963-10-01), Dunseth
patent: 3784861 (1974-01-01), Notelteirs et al.

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