Cooperative Patent Classification

CPC Definition - Subclass H03J

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Last Updated Version: 2016.11
TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS (indicating arrangements for measuring G01D; measuring, testing G01R; remote-control in general G05, G08; automatic control or stabilisation of generators H03L)
Definition statement

This place covers:

  • tuning of resonating circuits, in particular RLC circuits in which the inductance and/or the capacitance is controlled;
  • this subclass also covers the control of tuning, including the combined control of tuning and other functions, e.g. combinations of tuning control and volume control, combinations of control of local oscillator circuits and of supplementary resonant circuits.
References
Limiting references

This place does not cover:

Indicating arrangements for measuring

Measuring, testing

Remote-control in general

Automatic control or stabilisation of generators

Informative references

Attention is drawn to the following places, which may be of interest for search:

Resonator consisting of distributed elements

Antennas

Oscillators

Filters comprising lumped elements

Radio receiver circuits

Calibrating and monitoring of receivers and transmitters

Television receiver circuits

Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general (machine elements in general F16; coupling of knobs to shafts F16D)
Definition statement

This place covers:

References
Limiting references

This place does not cover:

Machine elements in general

Coupling of knobs to shafts

Continuous tuning (H03J 7/00, H03J 9/00 take precedence; combination of continuous and discontinuous tuning other than for bandspreading H03J 5/00)
Definition statement

This place covers:

Tuned circuits in which the tuning (or control) signal is continuously applied to the resonating circuit.

References
Limiting references

This place does not cover:

Combination of continuous and discontinuous tuning other than for bandspreading

Automatic frequency control; Automatic scanning over a band of frequencies

Remote-control of tuned circuits; Combined remote-control of tuning and other functions, e.g. brightness, amplification

Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner (H03J 7/00, H03J 9/00 take precedence; for bandspreading H03J 3/10)
Definition statement

This place covers:

  • Tuned circuits in which the tuning (or control) signal is not continuously applied to the resonating circuit;
  • Radio frequency filters used for bandswitching in receivers and transmitters.
References
Limiting references

This place does not cover:

Tuning for bandspreading

Automatic frequency control; Automatic scanning over a band of frequencies

Remote-control of tuned circuits; Combined remote-control of tuning and other functions, e.g. brightness, amplification

Automatic frequency control; Automatic scanning over a band of frequencies
Definition statement

This place covers:

  • Automatic frequency control circuits, such as used in radio and television receivers: H03J 7/02 - H03J 7/16;
  • Automatic scanning over a band of frequencies, with or without mircrocomputer controlled circuits: H03J 7/18 - H03J 7/32.
References
Limiting references

This place does not cover:

Automatic frequency control (H03J 7/18 takes precedence)

Informative references

Attention is drawn to the following places, which may be of interest for search:

Automatic tuning control for television receivers

Remote-control of tuned circuits; Combined remote-control of tuning and other functions, e.g. brightness, amplification (mechanical remote-control arrangements H03J 1/00; {using a microprocessor H03J 1/0025; constructional details of remote control switching devices H01H 9/0235})
Definition statement

This place covers:

Remote control of tuned circuits such as used in television and radio receivers and consumer electronics in general.

References
Limiting references

This place does not cover:

Mechanical remote-control arrangements

Using a microprocessor

Constructional details of remote control switching devices

Informative references

Attention is drawn to the following places, which may be of interest for search:

Universal remote controls

Remote control of television receivers

Housing of remote controls