G05F 3/20 using diode- transistor combinations (G05F3/18 takes precedence)
Introduced: January 1980
Title
Titles differ between systems:
IPC: using diode-transistor combinations
CPC: using diode- transistor combinations (G05F3/18 takes precedence)
Full Title
Full titles differ between systems:
Non-retroactive systems for regulating electric variables by using an uncontrolled element, or an uncontrolled combination of elements, such element or such combination having self-regulating properties > Regulating voltage or current > wherein the variable is DC > using uncontrolled devices with non-linear characteristics > being semiconductor devices > using diode-transistor combinations
Non-retroactive systems for regulating electric variables by using an uncontrolled element, or an uncontrolled combination of elements, such element or such combination having self-regulating properties > Regulating voltage or current > wherein the variable is DC > using uncontrolled devices with non-linear characteristics > being semiconductor devices > using diode- transistor combinations (G05F3/18 takes precedence)
Of 5 combined children, 4 exist in both systems.
1 codes are CPC-only extensions.
3 shared codes have differing titles between IPC and CPC.
IPC defines codes here since 1985.
Child Classifications
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- G05F 3/22 wherein the transistors are of the bipolar type only (G05F3/26, G05F3/30 take precedence) since 1985 +1 CPC IPC+CPC Available in IPC and CPC
- G05F 3/24 wherein the transistors are of the field-effect type only (G05F3/205, G05F3/26, G05F3/30 take precedence) since 1985 +1 CPC IPC+CPC Available in IPC and CPC
- G05F 3/30 Regulators using the difference between the base-emitter voltages of two bipolar transistors operating at different current densities (G05F3/26 takes precedence) since 1985 IPC+CPC Available in IPC and CPC
Top Applicants
Top Applicants (IPC)
Class G05,2013–2023, worldwide · Source: EPO PATSTAT
- SIEMENS DE 4,725
- SGCC(STATE GRID CORPORATION OF CHINA) 4,571
- FANUC JP 4,233
- MITSUBISHI ELECTRIC CORPORATION JP 3,143
- FANUC 2,981
- ROBERT BOSCH DE 2,813
- CHINESE ACADEMY OF SCIENCES 2,500
- LG ELECTRONICS KR 2,182
- OMRON CORPORATION JP 2,036
- SAMSUNG ELECTRONICS COMPANY KR 1,981
Top Applicants (CPC)
Class G05,2013–2023, worldwide · Source: EPO PATSTAT
- FANUC JP 6,367
- SIEMENS DE 5,963
- FANUC 4,535
- MITSUBISHI ELECTRIC CORPORATION JP 4,201
- ROBERT BOSCH DE 4,010
- LG ELECTRONICS KR 3,802
- SAMSUNG ELECTRONICS COMPANY KR 3,143
- FORD GLOBAL TECHNOLOGIES US 2,889
- TOYOTA MOTOR CORPORATION 2,778
- OMRON CORPORATION JP 2,743