Stock material or miscellaneous articles – Composite – Of quartz or glass
Reexamination Certificate
2011-03-22
2011-03-22
Loney, Donald (Department: 1783)
Stock material or miscellaneous articles
Composite
Of quartz or glass
C428S034000, C428S432000, C428S699000, C428S701000, C428S702000, C359S359000, C359S586000, C359S588000, C052S786100
Reexamination Certificate
active
07910215
ABSTRACT:
Transparent especially glass, substrate (6) having at least on one of its sides an antireflection coating made from a stack (A) of thin dielectric layers of alternating high and low refractive indices, characterized in that the stack comprises, in succession: a high-index first film (1) having a refractive index n1between 1.8 and 2.3 and a geometrical thickness e1of between 10 and 25 nm; a low-index second film (2) with a refractive index n2of between 1.40 and 1.55 and a geometrical thickness e2of between 20 and 50 nm; a high-index third film (3) with a refractive index n3of between 1.8 and 2.3 and a geometrical thickness n3of between 110 and 150 nm; and a low-index fourth film (4) with a refractive index n4of between 1.40 and 1.55 and a geometrical thickness e4of between 60 and 95 nm, the algebraic sum of the geometrical thickness e3+e1being between 125 and 160 nm.
REFERENCES:
patent: 5728456 (1998-03-01), Adair et al.
patent: 6068914 (2000-05-01), Boire et al.
patent: 6924037 (2005-08-01), Joret et al.
patent: 2006/0165963 (2006-07-01), Fleury et al.
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patent: 2004 005210 (2004-01-01), None
patent: 2005 016842 (2005-02-01), None
Martin Estelle
Reymond Vincent
Loney Donald
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Saint-Gobain Glass France
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