Electric lamp and discharge devices – With luminescent solid or liquid material – With gaseous discharge medium
Patent
1987-09-24
1989-02-14
Moore, David K.
Electric lamp and discharge devices
With luminescent solid or liquid material
With gaseous discharge medium
313635, 220 21R, 427 67, 427106, 445 8, 445 26, 445 58, H01J 924, H01J 6135
Patent
active
048048860
ABSTRACT:
A fluorescent lamp including a glass envelope having first and second end caps at the opposite ends thereof and each end cap provided with a connecting pin, the glass envelope containing energization means for generating light emanating from the lamp and upon energization thereof a first portion of the glass envelope adjacent the first end cap and a second portion of the glass envelope adjacent the second end cap being heated to a first temperature and an intermediate glass portion intermediate the first and second glass portions being heated to a second temperature lower than the first temperature, and a composite safety coating including first and second substantially light transparent coatings and an intermediate substantially light transparent coating intermediate the first and second coatings, the first coating surrounding and secured to the first glass portion and including an outer end portion surrounding and secured to a portion of the first end cap not including the first connecting pin and including an inner end portion, the second coating surrounding and secured to the second glass portion and including an outer end portion surrounding and secured to a portion of the second end cap not including the second connecting pin and including an inner end portion, the intermediate coating surrounding and secured to the intermediate glass portion and including opposed end portions respectively adjacent and interconnected to the inner end portions of the first and second coatings, the first and second coatings light transparent and non-degradeable to at least the first temperature and the intermediate coating light transparent and non-degradeable to at least the second temperature, upon the glass envelope being broken into glass shards the composite coating maintaining the glass shards and the end caps in association to prevent broadcasting of the glass shards.
REFERENCES:
patent: 3602759 (1971-08-01), Evans
Nolan James D.
St. Pierre Rene
Moore David K.
Nolan James D.
Rhodes, Jr. R. Gale
Wieder K.
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