Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
January 27, 2009
Patent Application Number
11333295
Date Filed
January 18, 2006
Patent Primary Examiner
Patent abstract
An optical disc has a support base and at least one information-retrieval layer formed over the support base. The information-retrieval layer is transparent and thinner than the support base. The information-retrieval layer exhibits variation in birefringence within ±20 nmpp (nano meter peak to peak) under double-pass measurements during one rotation of the optical disc.
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