US PATENT SUBCLASS 600 / 330
.~.~.~.~.~ Separation of ac/dc components in signal

Current as of: June, 1999
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600 /   HD   SURGERY

300  DF  DIAGNOSTIC TESTING {38}
309  DF  .~ Measuring or detecting nonradioactive constituent of body liquid by means placed against or in body throughout test {8}
310  DF  .~.~ Infrared, visible light, or ultraviolet radiation directed on or through body or constituent released therefrom {9}
322  DF  .~.~.~ Determining blood constituent {2}
323  DF  .~.~.~.~ Oxygen saturation, e.g., oximeter {13}
330.~.~.~.~.~ Separation of ac/dc components in signal

DEFINITION

Classification: 600/330

Separation of ac/dc components in signal:

(under subclass 323) Subject matter wherein the oxygen saturation of blood is accomplished by the introduction of light, which produces a signal which is filtered to obtain its alternating and direct current components to determine the root-mean square (RMS) or quotient of said current.