(under the class definition) Subject matter wherein the signal energy is coupled to or from the amplifying device by means including distributed parameter wave transmission means; or circuit networks of lumped parameters or impedances designed to simulate the impedance characteristics of distributed parameter wave transmission means.
(1) Note. Distributed parameter transmission means as used in the definition above include long lines and long line elements such as telephone and telegraph lines, lecher lines, parallel transmission lines, in general, concentric lines, wave guides, cavity resonators, tuned transmission lines, etc.., which possess distributed capacitance and inductance. For the definition of such means and "lumped parameter or impedance" means as used above, see the class definition for Class 333, Wave Transmission Lines and Networks. Subject matter involving inherent capacity or inductance, as for example, between electrodes, or of a lead inside a tube when made use of as a lumped reactance circuit element, is classified in the appropriate subclass involving the circuit. Neutralization by feedback is classified in subclasses 76+ below.
(2) Note. Subject matter including distributed parameter circuit coupling means when combined with a special type of amplifying device is classified with the special type of device and not in this subclass. For example, subclass 43, for amplifiers having traveling wave type tubes, which include distributed parameter type delay lines, or wave guides.
SEE OR SEARCH THIS CLASS, SUBCLASS:
3, for amplifiers having plural diverse type amplifying devices.
4, for amplifiers having a maser type amplifying device. 5, for amplifiers which have solid element wave propagating amplifying devices.
43, for amplifiers having a traveling wave type tube amplifying device.
45, for electron beam tube amplifying devices coupled to a cavity resonator.
49, for amplifiers having an amplifying device of the vacuum tube type having distributed parameter characteristics.
107, for signal feedback amplifiers having phase shift means in the loop path.
157+, for amplifier interstage coupling.
185+, for amplifier input coupling.
192+, for amplifier output coupling.
SEE OR SEARCH CLASS
315, Electric Lamp and Discharge Devices: Systems, appropriate subclasses indented under
3, and subclass 39 for distributed parameter impedance devices.
333, Wave Transmission Lines and Networks, appropriate subclasses for passive distributed impedance devices. See the notes under the class definitions and search notes under the pertinent subclasses of Class 333.
