Method of tempering glass having openings therethrough

Details Method of tempering glass having openings therethrough Method of tempering glass having openings therethrough

1976-08-13

1977-05-17

Kellogg, Arthur D.

Glass manufacturing

Processes

Glass preform treating

65104, 65105, 65114, C03B 2100, C03B 2700

Patent

active

040239454

ABSTRACT:
This disclosure is directed to an improvement in the method of tempering glass sheets having at least one opening therethrough so as to reduce the breakage which occurs to such glass sheets because of the stresses set up therein during the quenching portion of a glass tempering operation. The method involves cutting a relief opening in the glass sheet from the opening in the glass sheet to an edge of the glass sheet. Thereafter the tempering operation is carried out on the glass sheet after the relief opening has been cut therein.

REFERENCES:
patent: 2237982 (1941-04-01), Ferlito
patent: 3369883 (1968-02-01), Smith
patent: 3453097 (1969-07-01), Hafner
patent: 3551234 (1970-12-01), Britton

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