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US 4,104,076 AGranted
Manufacture of novel grey and bronze glasses
AssigneeSaint-Gobain Industries
InventorAndre Pons
Life of this patent
Estimating the term…
Abstract
A method of making heat absorbing glass which comprises melting the raw materials of ordinary silica-soda-lime glass and incorporating therein during melting a quantity of the tinting agents Fe.sub.2 O.sub.3, CoO, Se, UO.sub.2 and Cr.sub.2 O.sub.3 sufficient to produce in a piece 2-12 mm. thick a purity of excitation less than 14%, a total transmission of solar energy less than 50%, and a factor of luminance Y between 35 and 55%, and shaping articles therefrom.
Claims4
A tinted silica-soda-lime glass consisting in its essential elements, by weight percent, of:
- SiO.sub.2 60-75%, B.sub.2 O.sub.3 0-7%, Al.sub.2 O.sub.3 0-5%, K.sub.2 O + Na.sub.2 O 10-20% of which K.sub.2 O is 0-10%, CaO + MgO 6-18% of which CaO is 0- 16% and MgO is 0-10%, and containing by weight percent of tinting agents:
- Fe.sub.2 O.sub.3 0.2-1.5%, CoO 0.0010-0.0300%, Se 0-0.0200%, and Cr.sub.2 O.sub.3 0.0010-0.0200%.
Dependencies are inferred from the claim text.