Electric lamp with composite safety coating and process of manufacture
First Claim
1. Fluorescent lamp with composite safety coating, comprising:
- a fluorescent lamp including a glass envelope, a first end cap including a first connecting pin connected to one end of said glass envelope and a second end cap including a second connecting pin connected to the opposite end of said glass envelope, said glass envelope containing energization means for generating light emanating from said lamp and upon energization thereof a first portion of said glass envelope adjacent said first end cap and a second portion of said glass envelope adjacent said second end cap being heated to a first temperature and an intermediate glass portion intermediate said first and second glass portions being heated to a second temperature lower than said first temperature, andcomposite safety coating including first and second substantially light transparent coatings and an intermediate substantially light transparent coating intermediate said first and second coatings, said first coating surrounding and secured to said first glass portion and including an outer end portion surrounding and secured to a portion of said first end cap not including said first connecting pin and including an inner end portion, said second coating surrounding and secured to said second glass portion and including an outer end portion surrounding and secured to a portion of said second end cap not including said second connecting pin and including an inner end portion, said intermediate coating surrounding and secured to said intermediate glass portion and including opposed end portions respectively adjacent and interconnected to said inner end portions of said first and second coatings, said first and second coatings non-degradeable to at least said first temperature and said intermediate coating non-degradeable to at least said second temperature, upon said glass envelope being broken into glass shards said composite coating maintaining said glass shards and said end caps in association to prevent broadcasting of said glass shards.
2 Assignments
0 Petitions
Accused Products
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.
23 Citations
25 Claims
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1. Fluorescent lamp with composite safety coating, comprising:
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a fluorescent lamp including a glass envelope, a first end cap including a first connecting pin connected to one end of said glass envelope and a second end cap including a second connecting pin connected to the opposite end of said glass envelope, said glass envelope containing energization means for generating light emanating from said lamp and upon energization thereof a first portion of said glass envelope adjacent said first end cap and a second portion of said glass envelope adjacent said second end cap being heated to a first temperature and an intermediate glass portion intermediate said first and second glass portions being heated to a second temperature lower than said first temperature, and composite safety coating including first and second substantially light transparent coatings and an intermediate substantially light transparent coating intermediate said first and second coatings, said first coating surrounding and secured to said first glass portion and including an outer end portion surrounding and secured to a portion of said first end cap not including said first connecting pin and including an inner end portion, said second coating surrounding and secured to said second glass portion and including an outer end portion surrounding and secured to a portion of said second end cap not including said second connecting pin and including an inner end portion, said intermediate coating surrounding and secured to said intermediate glass portion and including opposed end portions respectively adjacent and interconnected to said inner end portions of said first and second coatings, said first and second coatings non-degradeable to at least said first temperature and said intermediate coating non-degradeable to at least said second temperature, upon said glass envelope being broken into glass shards said composite coating maintaining said glass shards and said end caps in association to prevent broadcasting of said glass shards. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. Process of providing a fluorescent lamp with a composite safety coating, said 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, upon said glass envelope being broken into glass shards said composite safety coating for maintaining said glass shards and said end caps in association to prevent broadcasting of said glass shards, said glass envelope containing energization means for generating light emanating from said lamp, and upon energization thereof first and second glass portions of said glass envelope respectively adjacent said first and second end caps being heated to a first temperature and an intermediate glass portion intermediate said first and second glass portions being heated to a second temperature lower than said first temperature, said process comprising the steps of:
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coating said first and second glass portions and portions of said first and second end caps not including said connecting pins, respectively, with first and second substantially light transparent coatings non-degradeable to at least said first temperature, coating said intermediate glass portion with an intermediate substantially light transparent coating non-degradeable to at least said second temperature, said intermediate coating having opposed end portions and said first and second coatings having inner end portions respectively adjacent said opposed end portions of said intermediate coating; and interconnecting said opposed end portions of said intermediate coating respectively to said adjacent inner end portions of said first and second coatings. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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Specification