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US 4,788,562 AGranted
Optical recording medium
AssigneeBASF SE
InventorsHelmut Barzynski, Herbert Naarmann
Life of this patent
Estimating the term…
Abstract
In an optical recording medium of the reflection type, the light-absorbing layer contains polypyrrole as the light-absorbing substance.
Claims2
An optical recording medium consisting essentially of, a base, a light-reflecting layer on said base, and a light-absorbing layer on said base and reflecting layer, said light-absorbing layer containing polypyrrole as the light-absorbing substance.
Dependencies are inferred from the claim text.