Dark blue dyed furnace sight glass with high infrared absorption
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United States of America Patent
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Jun 25, 1985
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N/A
app pub date -
May 26, 1983
filing date -
May 27, 1982
priority date (Note) -
Expired
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Abstract
Dark blue dyed furnace sight glass of soda-lime-silica further containing carbon and oxides of iron and cobalt with substantially no infrared transmission and which sight glass affords a view of details in the melting operation. Other ingredients may include K.sub.2 O, MgO, Al.sub.2 O.sub.3 or ZrO.sub.2.
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