US PATENT SUBCLASS 330 / 165
.~ Transformer coupling

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


330 /   HD   AMPLIFIERS

157  DF  INTERSTAGE COUPLING {11}
165.~ Transformer coupling {6}
166  DF  .~.~> With additional reactive coupling
167  DF  .~.~> With additional impedance connected to "P" or "S" circuits
168  DF  .~.~> From cathode
169  DF  .~.~> With means for adjusting inductive coupling
170  DF  .~.~> With shielding
171  DF  .~.~> With transformer structure

DEFINITION

Classification: 330/165

(under subclass 157) Subject matter wherein the the signal coupling between the two cascaded amplifying device stages is by means of at least one transformer.

SEE OR SEARCH THIS CLASS, SUBCLASS:

120, for interstage coupling in push-pull amplifiers including transformer coupling.

122, for input or output coupling in push-pull amplifiers including transformer coupling.

154, for transformer coupling in plural stage cascaded vacuum tube amplifiers with at least two interstage coupling networks which have some different characteristic.

188+, for transformer coupled amplifier input circuits. 195+, for transformer coupled amplifier output circuits.

SEE OR SEARCH CLASS

333, Wave Transmission Lines and Networks,

177+, for wave transmission transformer coupled circuits of the passive type, generally.

334, Tuners,

59+, and 61+ for tuners having a transformer in the resonant circuit.

336, Inductor Devices, appropriate subclasses, for transformer structure.