Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1974-05-06
1976-01-20
Lindsay, Jr., Robert L.
Glass manufacturing
Processes
Forming product or preform from molten glass
65 11W, 65 18, 65 31, 65 89, 65184, 65374, 65DIG7, 164346, 164400, 242159, 249183, 427167, C03C 2502, C03B 932, C03B 1906, C03C 1500
Patent
active
039334538
ABSTRACT:
There is disclosed a method and apparatus for providing optically pure glass blanks, tubing, crucibles and the like for use in forming optical waveguides, lenses, prisms, filters, lamp envelopes and the like. A glass layer is formed at a high temperature on a mandrel which includes a support rod or tube upon which is disposed a layer of refractory metal wire, gauze, foil or the like. The mandrel is so constructed that stresses, which heretofore have developed in the glass layer during cooling, are avoided, and the mandrel is easily removed from the glass layer, thereby forming a hollow glass cylinder that is free from cracks, checks and the like.
REFERENCES:
patent: 2171890 (1939-09-01), Precourt
patent: 3486870 (1969-12-01), Vervaart et al.
patent: 3737292 (1973-06-01), Keck et al.
patent: 3741796 (1973-06-01), Walker
Burke Gerald E.
DeLuca Robert D.
Corning Glass Works
Lindsay, Jr. Robert L.
Patty, Jr. Clarence R.
Simmons, Jr. William J.
Zebrowski Walter S.
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