Glass vessel in particular, an ampoule and a method for treating

Details Glass vessel in particular, an ampoule and a method for treating Glass vessel in particular, an ampoule and a method for treating

1989-04-21

1990-02-06

Kellogg, Arthur

Glass manufacturing

Processes

Glass preform treating

65105, 65112, 65120, 65 3014, C03B 3309

Patent

active

048986054

ABSTRACT:
A glass vessel, in particular an ampoule, having a prestress produced at a predetermined spot of the vessel which permits an automatic opening of the vessel at the predetermined spot following scratching by means of a suitable tool. The prestress, which is produced exclusively by means of an earlier thermal treatment without the application of a tool exhibits a stress profile in which an initially produced annular tensile stress ring, is overlapped at a predetermined spot by a point-shaped compressive stress zone that is produced subsequently.

REFERENCES:
patent: 2517604 (1950-08-01), Smith
patent: 3535070 (1970-10-01), Francel et al.

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