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US 4,228,206 AGranted
Method of processing glass tubing
AssigneeGTE Products Corporation
InventorJohn S. Fabisak
Life of this patent
Estimating the term…
Abstract
The alkali content of the inner surface of glass tubing is reduced by introducing an acidic gas into the glass tubing at the hot draw stage to react with alkali ions on the inner surface of the glass.
Claims9
The method of making fluorescent lamps so as to increase the brightness thereof comprising the steps of:
- drawing hot glass from a melt through a bag stage, where the glass is above its softening temperature, and into the shape of tubing;
- dispensing into the hot bag an acidic gas which reacts with alkali on the inner surface of the hot glass to form water soluble alkaline salts;
- cooling the tubing and cutting it into predetermined lengths;
- coating said predetermined lengths with phosphor;
- and forming said coated predetermined lengths into fluorescent lamps.
2 more elements
Dependencies are inferred from the claim text.