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

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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H03J 1/00 Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
H03J 3/00 Continuous tuning
H03J 5/00 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 Automatic frequency control; Automatic scanning over a band of frequencies
H03J 9/00 Remote-control of tuned circuits; Combined remote-control of tuning and other functions, e.g. brightness, amplification

Top Applicants

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

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