G01J 2009/028 — IPC vs CPC Diff | Patent Classification Explorer

DIFF Subgroup Additional Only

G01J 2009/028

Full Title

Measuring optical phase difference (devices or arrangements for controlling the phase of light beams G02F1/01); Determining degree of coherence; Measuring optical wavelength (spectrometry G01J3/00) > by interferometric methods (using interferometers for measuring optically the linear dimensions of objects G01B9/02)

Of 4 combined children, 0 exist in both systems.

4 codes are CPC-only extensions.

Note: 4 CPC extensions are marked as secondary classification only.

This code exists only in CPC.

Diff view requires codes present in both systems.

View in CPC →