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US 6,187,390 B1Granted
Use of hydride-containing aluminum oxide for producing optically detectable markings and inscriptions
AssigneeBASF SE
InventorsOliver Seeger, Stefan Faber, Michael Veith, Eckehard Fritscher, Wilma M. Dausch, Raimund Schmid
Life of this patent
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Abstract
The invention concerns the use of hydride-containing aluminium oxide for producing optically detectable markings and inscriptions.
Claims8
A process which comprises:
- (A)(1) either coating a transparent hydride-containing aluminum oxide which has a hydrogen content of from 15 to 100 atom-% per aluminum atom, onto a substrate, or (2) incorporating said transparent hydride-containing aluminum oxide into a substrate;
- and (B) converting said transparent hydride-containing aluminum oxide into aluminum oxide containing gray to black, metallic aluminum by exposure to an energy source.
Dependencies are inferred from the claim text.