H03L AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES (generation of oscillations H03B)
Introduced: January 1980
Description
H03L covers automatic control systems and circuits that manage the operation of electronic oscillation and pulse generators. This includes starting mechanisms, frequency synchronization, amplitude stabilization, and phase control of oscillators and signal generators. The subclass encompasses feedback control loops, phase-locked loops (PLLs), automatic gain control (AGC), and synchronization circuits used in radio transmitters, receivers, timing systems, and other applications requiring precise oscillation management. Related generator design itself falls under H03B, while modulation techniques are classified separately in H03C.
Title
Titles differ between systems:
IPC: AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
CPC: AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES (generation of oscillations H03B)
Full Title
Full titles differ between systems:
AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES (generation of oscillations H03B)
Additional Content IPC
Generation of oscillations
Of 6 combined children, 5 exist in both systems.
1 codes are CPC-only extensions.
Note: 1 CPC extensions are marked as secondary classification only.
IPC defines codes here since 1980.
Child Classifications
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- H03L 1/00 Stabilisation of generator output against variations of physical values, e.g. power supply since 1980 IPC+CPC Available in IPC and CPC
- H03L 2207/00 Indexing scheme relating to automatic control of frequency or phase and to synchronisation 2nd only +9 CPC CPC only CPC only
- H03L 5/00 Automatic control of voltage, current, or power since 1980 IPC+CPC Available in IPC and CPC
- H03L 7/00 Automatic control of frequency or phase; Synchronisation since 1980 IPC+CPC Available in IPC and CPC
- H03L 9/00 Automatic control not provided for in other groups of this subclass since 2006 IPC+CPC Available in IPC and CPC
Top Applicants
Top Applicants (IPC)
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
Top Applicants (CPC)
Class H03,2013–2023, worldwide · Source: EPO PATSTAT
- SAMSUNG ELECTRONICS COMPANY KR 7,293
- QUALCOMM US 7,085
- MURATA MANUFACTURING COMPANY JP 5,982
- HUAWEI TECHNOLOGIES COMPANY CN 4,641
- INTEL CORPORATION US 3,863
- TEXAS INSTRUMENTS US 3,409
- MURATA MANUFACTURING COMPANY 2,874
- SK HYNIX KR 2,644
- SKYWORKS SOLUTIONS US 2,545
- IBM (INTERNATIONAL BUSINESS MACHINES CORPORATION) US 2,437