Coating processes – Electrical product produced – Fluorescent or phosphorescent base coating
Patent
1992-09-23
1993-11-02
Beck, Shrive
Coating processes
Electrical product produced
Fluorescent or phosphorescent base coating
427 67, 4271262, 4271263, 4271264, 427157, 427185, 427213, 427215, 4273762, B05D 506
Patent
active
052582019
ABSTRACT:
A method of forming a partial protective coating on phosphor particles to improve initial power output and maintenance of fluorescent lamps made with the phosphor. The phosphor particles are fluidized in a bed and at least partially enveloped by a coating precursor material. Residence time of the phosphor particles in the fluidized bed is short so that the phosphor particles are only partially coated with the coating precursor material. The coating precursor material is reacted to form a protective coating over at least a portion of the surface of the phosphor particles. The partially-coated phosphor particles are then annealed to cause the protective coating to selectively cover at least a portion of certain sites on the surface of the phosphor particles.
REFERENCES:
patent: 4585673 (1986-04-01), Sigai
patent: 4691140 (1987-09-01), Sakakibara et al.
patent: 4710674 (1987-12-01), Sigai
patent: 4892757 (1990-01-01), Kasenga et al.
patent: 4925703 (1990-05-01), Kasenga et al.
patent: 4956202 (1990-09-01), Kasenga et al.
Benjamin Dale E.
Lutz Deborah V.
Munn Robin W.
Beck Shrive
Levy Elizabeth A.
Utech Benjamin L.
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