Appeal No. 1998-1472 Page 3
Application No. 08/427,721
The storage capacity of the inventive optical disk
exceeds that of existing, commercially available CD-ROM. In
addition, some embodiments of the invention can employ a
conventional CD-
ROM disk drive, thereby taking advantage of the mature
technologies associated with these devices.
Claim 151, which is representative for our purposes,
follows:
Claim 151. A method for reading data from an
optical disk, the disk being comprised of a material
in which a holographic grating may exist at plural
locations within the disk wherein the holographic
grating represents a stored data element, the method
comprising the step of:
reading data elements using an electro-optical
head by detecting one of (i) a presence, or (ii) an
absence of a holographic grating at the plural
locations within the disk, using a plane-wave light
beam.
The references relied on in rejecting the claims follow:
Takeda et al. (Takeda) 4,021,606 May 3, 1977
Bjorklund et al. (Bjorklund) 4,458,345 July
3, 1984
Murakami 4,761,775 Aug.
2, 1988
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