Making glass sheet with defect-free surfaces and alkali metal-fr

Details Making glass sheet with defect-free surfaces and alkali metal-fr Making glass sheet with defect-free surfaces and alkali metal-fr

1993-07-16

1994-08-30

Jones, W. Gary

Glass manufacturing

Processes

With destruction or delamination of transitory attached or...

65 31, 65 90, 65121, 156657, 156663, 501 75, 501 49, 501 52, C03C 2300

Patent

active

053424263

ABSTRACT:
This invention is directed to a method for preparing glass sheet having surfaces which are essentially defect-free and equivalent in smoothness to polished glass surfaces which comprises the steps of: Two different batches of alkali-metal-free batches are melted and formed into a laminated sheet and the first glass is enclosed by the second glass. The second glass is 1000 times more soluble than the first glass. The laminate is contacted with an acid to dissolve the second glass wherein the first glass remains with essentially defect free surfaces.

REFERENCES:
patent: 3338696 (1967-08-01), Dockerty
patent: 3673049 (1972-06-01), Giffen
patent: 3682609 (1972-08-01), Dockerty
patent: 4102664 (1978-07-01), Dumbaugh
patent: 4824808 (1989-04-01), Dumbaugh
patent: 4880453 (1989-11-01), Coppola et al.
patent: 5100452 (1992-03-01), Dumbaugh
patent: 5116787 (1992-05-01), Dumbaugh
patent: 5116788 (1992-05-01), Dumbaugh
patent: 5116789 (1992-05-01), Dumbaugh et al.

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