US PATENT SUBCLASS 369 / 111
.~.~ Spiral or helical track

Current as of: June, 1999
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369 /   HD   DYNAMIC INFORMATION STORAGE OR RETRIEVAL

99  DF  SPECIFIC DETAIL OF INFORMATION HANDLING PORTION OF SYSTEM {4}
100  DF  .~ Radiation beam modification of or by storage medium {20}
111.~.~ Spiral or helical track

DEFINITION

Classification: 369/111

Spiral or helical track:

(under subclass 100) Subject matter wherein the path along which the information is stored or retrieved has plural, curved turns about an axis of rotation of the storage medium.