US PATENT SUBCLASS 369 / 44.42
.~.~.~ Beam or detector is not rectangular or circular

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

43  DF  WITH SERVO POSITIONING OF TRANSDUCER ASSEMBLY OVER TRACK COMBINED WITH INFORMATION SIGNAL PROCESSING {1}
44.11  DF  .~ Optical servo system {12}
44.41  DF  .~.~ Arithmetic operation using plural photodetectors {1}
44.42.~.~.~ Beam or detector is not rectangular or circular

DEFINITION

Classification: 369/44.42

Beam or detector is not rectangular or circular:

Subject matter under 44.41 wherein either the beam or the detector has a shape other than rectangular or circular.