High transmittance, low emissivity coatings for substrates
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United States of America Patent
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Apr 12, 1994
Grant Date -
N/A
app pub date -
Mar 27, 1992
filing date -
Mar 27, 1992
priority date (Note) -
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Abstract
The present invention provides a coating for a transparent substrate which exhibits a neutral color through a wide range of angles of incidence a light. The coating employs a base coat adjacent to the transparent substrate having a thickness of no more than about 275 Angstroms and may include two reflective metal layers having an intermediate layer of an anti-reflective metal oxide therebetween and an outer anti-reflective layer of metal oxide over the second reflective metal layer. If so desired, the coating of the invention may include an abrasive-resistant overcoat as its outer most layer. This overcoat is desirably formed of an abrasive-resistant metal oxide, such as zinc oxide, applied at a thickness which does not significantly affect the optical properties of said coated substrate.
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