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IPC Subclass
H03J

TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS

Introduced: September 1968

Classification Context

Section:
ELECTRICITY
Class:
ELECTRONIC CIRCUITRY
Subclass:
TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS

Description

H03J covers devices and methods for adjusting the resonant frequency of LC circuits and selecting among multiple resonant circuits. This includes mechanical tuning mechanisms (variable capacitors, inductors), electronic tuning approaches (varactor diodes, voltage-controlled oscillators), and circuit selection switching. The class encompasses applications in radio receivers, transmitters, and frequency-selective filters where precise frequency control or channel selection is required. Related but separate classes handle specific oscillator designs (H03B) and general frequency control or synchronization circuits (H03L).

Filing statistics

IPC subclass H03J recorded 1,256 patent applications worldwide between 2013 and 2023. Annual filings declined from 190 in 2013 to 41 in 2023 (-78%). The most active applicants in class H03 are QUALCOMM (5,625 applications), SAMSUNG ELECTRONICS COMPANY (5,496 applications) and MURATA MANUFACTURING COMPANY (5,478 applications).

Source: EPO PATSTAT, worldwide filings

In class comparison

H03J ranks 10th of 10 subclasses with filings in H03, with 1,256 applications between 2013 and 2023, 0.4% of the class. Annual filings declined 78% from 2013 to 2023, below the class as a whole (+15%).

Subclasses of class H03 by patent applications, 2013–2023
RankSubclassTitleApplicationsShare
1H03K, Pulse TechniquePulse Technique110,91732.9%
2H03M, Coding, Decoding or Code Conversion, in GeneralCoding, Decoding or Code Conversion, in General65,78919.5%
3H03H, Impedance Networks, e.g. Resonant Circuits; ResonatorsImpedance Networks, e.g. Resonant Circuits; Resonators56,43116.7%
4H03F, AmplifiersAmplifiers50,74915.0%
5H03L, Automatic Control, Starting, Synchronisation or Stabilisation of Generators of Electronic Oscillations or PulsesAutomatic Control, Starting, Synchronisation or Stabilisation of Generators of Electronic Oscillations or Pulses21,0486.2%
6H03G, Control of AmplificationControl of Amplification13,1463.9%
7H03B, Generation of Oscillations, Directly or by Frequency-Changing, by Circuits Employing Active Elements Which Operate in a Non-Switching Manner; Generation of Noise by Such CircuitsGeneration of Oscillations, Directly or by Frequency-Changing, by Circuits Employing Active Elements Which Operate in a Non-Switching Manner; Generation of Noise by Such Circuits11,8593.5%
8H03D, Demodulation or Transference of Modulation From One Carrier to AnotherDemodulation or Transference of Modulation From One Carrier to Another4,9601.5%
9H03C, ModulationModulation1,2830.4%
10H03JTuning Resonant Circuits; Selecting Resonant Circuits1,2560.4%

Source: EPO PATSTAT, worldwide filings

Related Keywords

selecting CHANNELS for telecommunicationPUSH-BUTTON(S) tuner arrangements for electronic circuitstuning resonant circuitsselecting of frequency channels for TELECOMMUNICATIONtuning for TELECOMMUNICATIONTUNING of resonant circuitsTURRET(S) tuning arrangementsselecting WAVE -bands for telecommunication

5 direct subcodes

Child Classifications

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Top Applicants

Top 10 applicants by patent filingsfor class H03, 2013–2023, worldwide · Source: EPO PATSTAT

  1. QUALCOMM US 5,625
  2. SAMSUNG ELECTRONICS COMPANY KR 5,496
  3. MURATA MANUFACTURING COMPANY JP 5,478
  4. HUAWEI TECHNOLOGIES COMPANY CN 3,383
  5. INTEL CORPORATION US 3,091
  6. TEXAS INSTRUMENTS US 3,070
  7. MURATA MANUFACTURING COMPANY 2,722
  8. SKYWORKS SOLUTIONS US 2,290
  9. SEIKO EPSON CORPORATION 2,177
  10. IBM (INTERNATIONAL BUSINESS MACHINES CORPORATION) US 2,158