Back to results
US 4,061,946 AGranted
Fluorescent lamp having zero back brightness
AssigneeGTE Sylvania Incorporated
InventorWilly P. Schreurs
Life of this patent
Estimating the term…
Abstract
In a directional fluorescent lamp having a reflector layer between the phosphor and the glass envelope wall, there is a dark, nonreflecting, light-absorbing layer between the reflector layer and the glass to prevent light escaping from the back of the lamp.
Claims4
In a directional fluorescent lamp of the type comprising a tubular glass envelope having a reflector coating sandwiched between a phosphor layer and the glass envelope, the improvement which comprises a dark, nonreflecting, electrically nonconducting light-absorbing layer between the reflector coating and the glass envelope.
Dependencies are inferred from the claim text.