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Electric lamp with composite safety coating and process of manufacture

  • US 4,804,886 A
  • Filed: 09/24/1987
  • Issued: 02/14/1989
  • Est. Priority Date: 01/02/1987
  • Status: Expired due to Term
First Claim
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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.

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