Toughened glass sheets

Details Toughened glass sheets Toughened glass sheets

1977-03-01

1978-12-05

Kellogg, Arthur D.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

65114, 65115, 428220, 428410, C08B 2700

Patent

active

041286901

ABSTRACT:
Thermally toughened glass sheets of thickness 2.5 mm to 3.5 mm, for use as motor vehicle side or rear windows, are produced by differential quenching producing a distribution of regions of more highly toughened glass interspersed with regions of lesser toughened glass. The average central tensile stress is in the range 62 MN/m.sup.2 to 53 MN/m.sup.2, and there is a distribution of areas in which the principal stresses acting in the plane of the glass sheet are unequal. The principal stress difference in some of the areas is at a maximum in the range 8 MN/m.sup.2 to 25 MN/m.sup.2, the major principal stresses in adjacent areas in which the principal stress difference is a maximum are in different directions, and the distance between the centers of such adjacent areas is in the range 15 mm to 30 mm.

REFERENCES:
patent: 1916174 (1933-06-01), Long et al.
patent: 2078541 (1937-04-01), Monnier
patent: 2167294 (1939-07-01), Despret
patent: 3849100 (1974-11-01), Luppino

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