(under subclass 75) Subject matter wherein the "loop path" (see (3) Note under subclass 75 for the definition of loop path) includes voltage or current phase shift or delay means which may shift the phase of the voltage or current of one signal frequency or signal frequency feedback component with respect to another or shift the phase of the voltage of the signal or signal feedback with respect to the current.
(1) Note. Transformer or amplifier means which inherently shift the phase 1805 are not regarded as phase shift or voltage delay means for this subclass. If such transformer or
amplifier include additional phase shift means classification is herein.
SEE OR SEARCH THIS CLASS, SUBCLASS:
53+, for amplifiers having distributed parameter coupling which may include electric wave delay means.
101, for amplifiers having positive and negative feedback in the same path at different frequencies.
SEE OR SEARCH CLASS 323, Electricity: Power Supply or Regulation Systems,
212, 219 for phase control systems in general.
333, Wave Transmission Lines and Networks,
138+, for electric wave delay networks, of the passive type, see the search notes thereunder.
