Section G: Physics

Classes

Subclasses

918

Main Groups

9,601

IPC

38,254

CPC

Description

Section G encompasses inventions in physics and physical sciences, covering measurement, testing, navigation, timekeeping, and the detection or analysis of physical phenomena. This broad section includes technologies such as optical instruments, electrical measuring devices, timing mechanisms, and instruments for analyzing matter and energy. It serves as the foundational category for numerous specialized technical fields where physical principles are applied in measurement, control, and scientific instrumentation.

Visualizations

Size of each class by number of subgroups

Classes in section G by descendant count
Class	Title	Descendants
G01	MEASURING; TESTING	9,901
G02	OPTICS	2,355
G03	PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY	3,288
G04	HOROLOGY	998
G05	CONTROLLING; REGULATING	9,363
G06	COMPUTING OR CALCULATING; COUNTING	5,380
G07	CHECKING-DEVICES	786
G08	SIGNALLING	587
G09	EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS	1,151
G10	MUSICAL INSTRUMENTS; ACOUSTICS	1,302
G11	INFORMATION STORAGE	2,565
G12	INSTRUMENT DETAILS	31
G16	INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS	126
G21	NUCLEAR PHYSICS; NUCLEAR ENGINEERING	564
G99	SUBJECT MATTER NOT OTHERWISE PROVIDED FOR IN THIS SECTION	2

IPC and CPC are identically structured here. All 15 subcodes exist in both systems.

1 shared codes have differing titles between IPC and CPC.

Child Classifications

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G01 MEASURING; TESTING heading IPC+CPC Available in IPC and CPC
G02 OPTICS heading IPC+CPC Available in IPC and CPC
G03 PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY heading IPC+CPC Available in IPC and CPC
G04 HOROLOGY heading IPC+CPC Available in IPC and CPC
G05 CONTROLLING; REGULATING heading IPC+CPC Available in IPC and CPC
G06 COMPUTING OR CALCULATING; COUNTING heading IPC+CPC Available in IPC and CPC
G07 CHECKING-DEVICES heading IPC+CPC Available in IPC and CPC
G08 SIGNALLING heading IPC+CPC Available in IPC and CPC
G09 EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS heading IPC+CPC Available in IPC and CPC
G10 MUSICAL INSTRUMENTS; ACOUSTICS heading IPC+CPC Available in IPC and CPC
G11 INFORMATION STORAGE heading IPC+CPC Available in IPC and CPC
G12 INSTRUMENT DETAILS heading IPC+CPC Available in IPC and CPC
G16 INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS heading IPC+CPC Available in IPC and CPC
G21 NUCLEAR PHYSICS; NUCLEAR ENGINEERING heading IPC+CPC Available in IPC and CPC
G99 SUBJECT MATTER NOT OTHERWISE PROVIDED FOR IN THIS SECTION heading IPC+CPC Available in IPC and CPC