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Cathode filament for an ultra-violet discharge lamp

  • US 5,864,209 A
  • Filed: 10/30/1996
  • Issued: 01/26/1999
  • Est. Priority Date: 10/30/1996
  • Status: Expired due to Term
First Claim
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1. In an ultraviolet discharge lamp comprising a sealed bulb occupied by a gas, said bulb also holding an anode and a heated cathode, said cathode comprising a single coiled metal wire coated with an electron emitting material, the improvement comprising:

  • said coiled metal wire having three coils, a primary coil, a secondary coil, and a tertiary coil; and

    said material occupies the interstices of said primary and secondary coils but not said tertiary coil.

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