Fluorescent lamp with composite safety coating and process of ma

Details Fluorescent lamp with composite safety coating and process of ma Fluorescent lamp with composite safety coating and process of ma

1990-06-11

1991-08-27

Boudreau, Leo H.

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

313635, 313312, H01J 924, H01J 6135

Patent

active

050436260

ABSTRACT:
Composite safety coating and fluorescent lamp which lamp upon being energized causes the intermediate portion of the glass envelope to be heated to a relatively low temperature and causes the end portions of the glass envelope adjacent the end caps to be heated to a relatively high temperature, the composite safety coating includes a first substantially light transparent coating nondegradeable to the relatively low temperature surrounding and secured to the entire glass envelope and portions of the end caps, and second and third substantially light transparent coatings nondegradeable to the relatively high temperature surrounding the portions of the first coating surrounding the portions of the glass envelope heated to the relatively high temperature and portions of the end caps, the second and third coatings preventing degradation of the portions of the first coating surrounding the portions of the glass envelope heated to the relatively high temperature; and manufacturing process therefor.

REFERENCES:
patent: 3602759 (1971-08-01), Evans
patent: 3808495 (1974-04-01), Win
patent: 4507332 (1985-03-01), Nolan et al.
patent: 4804886 (1989-02-01), Nolan et al.

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