Glass manufacturing – Processes – With shaping of particulate material and subsequent fusing...
Patent
1992-09-30
1993-12-21
Beck, Shrive
Glass manufacturing
Processes
With shaping of particulate material and subsequent fusing...
65 184, 65122, 241 30, C03B 1909
Patent
active
052717542
ABSTRACT:
A thick glass coating protects fluorescent or phosphorescent pigment particles from greying or fading due to service conditions, such as photochemical reactions. The pigment particles are mixed with a finely ground heavy metal-free glass in a ratio of approximately 5 parts glass to 1 part pigment. The pigment and glass mixture is then heated to a point where said glass is softened to such an extent that the pigment particles are surrounded by the glass. The glass is thereafter comminuted into a granulate consisting of a plurality of small glass bodies. The granulate is reheated so that pigment particles exposed by the comminuting are resurrounded by the resoftened glass. The glass pigment mixture can alternatively be suspended in a liquid and poured into a mold before heating in order to form glass bodies having a particular shape.
REFERENCES:
patent: 3389458 (1968-06-01), Ostrander et al.
patent: 3856550 (1974-12-01), Bens et al.
patent: 4309481 (1982-01-01), Wakatsuki et al.
patent: 4473634 (1984-09-01), Dodds et al.
patent: 5051277 (1991-09-01), Sigai et al.
Bauerecker Sigurd
Cammenga Heiko K.
Bauerecker Sigurd
Beck Shrive
Utech Benjamin L.
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