US PATENT SUBCLASS 345 / 191
.~.~ Mask data operation

Current as of: June, 1999
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345 /   HD   COMPUTER GRAPHICS PROCESSING, OPERATOR INTERFACE PROCESSING, AND SELECTIVE VISUAL DISPLAY SYSTEMS

507  DF  DISPLAY STORAGE DEVICE {13}
509  DF  .~ Bit map or graphic memory {2}
191.~.~ Mask data operation

DEFINITION

Classification: 345/191

Mask data operation:

(under subclass 509) Subject matter wherein the store means stores information which covers previously stored information.