Large-capacity-memory disk

Details Large-capacity-memory disk Large-capacity-memory disk

1991-02-19

1992-01-14

Bowers, Jr., Charles L.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 65, 428913, 430945, 3461351, 346137, 360135, 3692751, 369283, 369286, B32B 300

Patent

active

050809458

ABSTRACT:
In a large capacity memory disk of the type in which data are read out by an optical system, the invention provides a large capacity memory disk characterized in that a methyl methacrylate copolymer consisting of 99 to 20 percent by weight methyl methacrylate and 1 to 80 percent by weight of a monomer copolymerizable with methyl methacrylate is used as the disk substrate.

REFERENCES:
patent: 2321759 (1943-06-01), Macht et al.
patent: 4918683 (1990-04-01), Kodera et al.

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