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| CPC | COOPERATIVE PATENT CLASSIFICATION |
| | RADIO-CONTROLLED TIME-PIECES |
| | Setting the time according to the time information carried or implied by the radio signal |
| G04R 20/02 | . | the radio signal being sent by a satellite, e.g. GPS |
| G04R 20/04 | . . | Tuning or receiving; Circuits therefor |
| G04R 20/06 | . . | Decoding time data; Circuits therefor |
| G04R 20/08 | . | the radio signal being broadcast from a long-wave call sign, e.g. DCF77, JJY40, JJY60, MSF60 or WWVB |
| G04R 20/10 | . . | Tuning or receiving; Circuits therefor |
| G04R 20/12 | . . | Decoding time data; Circuits therefor |
| G04R 20/14 | . | the radio signal being a telecommunication standard signal, e.g. GSM, UMTS or 3G |
| G04R 20/16 | . . | Tuning or receiving; Circuits therefor |
| G04R 20/18 | . . | Decoding time data; Circuits therefor |
| G04R 20/20 | . | the radio signal being an AM/FM standard signal, e.g. RDS |
| G04R 20/22 | . . | Tuning or receiving; Circuits therefor |
| G04R 20/24 | . . | Decoding time data; Circuits therefor |
| G04R 20/26 | . | the radio signal being a near-field communication signal |
| G04R 20/28 | . . | Tuning or receiving; Circuits therefor |
| G04R 20/30 | . . | Decoding time data; Circuits therefor |
| | Correcting the clock frequency |
| G04R 40/04 | . | by detecting the radio signal frequency |
| G04R 40/06 | . | by computing the time value implied by the radio signal |
| G04R 60/02 | . | Antennas also serving as components of clocks or watches, e.g. motor coils |
| G04R 60/04 | . | Antennas attached to or integrated in watch bracelets |
| G04R 60/06 | . | Antennas attached to or integrated in clock or watch bodies |
| G04R 60/14 | . | specific to electromechanical timepieces, e.g. moving parts thereof |
