| IPC 7 English version |
| G04G-G04G01912 |
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| SECTION G – PHYSICS |
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| G 04 | HOROLOGY |
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| G 04 G | ELECTRONIC TIME-PIECES [3] |
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| Notes |
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| (1) | This subclass covers: |
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| – | electronic time-pieces with no moving parts; [3] |
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| – | electronic circuitry for producing timing pulses irrespective of the nature of the time-indicating means utilised. [3] |
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| (2) | This subclass does not cover electronic time-pieces with moving parts, which are covered by subclass G04C. [3] |
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| Subclass Index |
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| PRODUCING TIMING PULSES |
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| TIME-SETTING; SYNCHRONISING |
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| TIME- OR DATE-INDICATING |
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| Visual; optical signals; acoustic signals |
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| OPERATING A DEVICE AT PRESELECTED TIMES |
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| STRUCTURAL DETAILS; HOUSINGS |
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| ELECTRIC POWER SUPPLY CIRCUITS |
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| OTHER SUBJECTS |
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1/ | 00 | Subject matter not provided for in groups G04G 3/00 to G04G 19/00 [3,7] |
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1/ | 02 | . | Input or output devices integrated in time-pieces [7] |
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1/ | 04 | . | . | Detectors of external physical values, e.g. temperature [7] |
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1/ | 06 | . | . | using radio waves [7] |
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1/ | 08 | . | . | using voice [7] |
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1/ | 10 | . | . | Touch switches specially adapted for time-pieces [7] |
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3/ | 00 | Producing timing pulses (driving circuits for stepping motors G04C 3/14; producing preselected time intervals for use as timing standards G04F 5/00; pulse technique in general H03K; control, synchronisation, or stabilisation of generators in general H03L) [3] |
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3/ | 02 | . | Circuits for deriving low frequency timing pulses from pulses of higher frequency (pulse frequency dividers in general H03K 23/00 to H03K 29/00) [3] |
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3/ | 04 | . | Temperature-compensating arrangements [7] |
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5/ | 00 | Setting, i.e. correcting or changing, the time-indication [3] |
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5/ | 02 | . | by temporarily changing the number of pulses per unit time, e.g. quick-feed method [3] |
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5/ | 04 | . | by setting each of the displayed values, e.g. date, hour, independently [3] |
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7/ | 00 | Synchronisation [3] |
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7/ | 02 | . | by radio [3] |
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9/ | 00 | Visual time or date indication means [3] |
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9/ | 02 | . | by selecting desired characters out of a number of characters or by selecting indicating elements the position of which represent the time, e.g. by using multiplexing techniques [3] |
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9/ | 04 | . | . | by controlling light sources, e.g. electroluminescent diodes [3] |
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9/ | 06 | . | . | using light valves, e.g. liquid crystals [3] |
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9/ | 08 | . | by building-up characters using a combination of indicating elements, e.g. by using multiplexing techniques [3] |
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9/ | 10 | . | . | by controlling light sources, e.g. electroluminescent diodes [3] |
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9/ | 12 | . | . | using light valves, e.g. liquid crystals [3] |
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11/ | 00 | Producing optical signals at preselected times [3] |
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13/ | 00 | Producing acoustic time signals [3] |
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13/ | 02 | . | at preselected times, e.g. alarm clocks [3] |
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15/ | 00 | Time-pieces comprising means to be operated at preselected times or after preselected time intervals (G04G 11/00, G04G 13/00 take precedence; pulse delay circuits H03K 5/13; electronic time-delay switches H03K 17/28; electronic time-programme switches which automatically terminate their operation after the programme is completed H03K 17/296; time programming for television signal recording H04N 5/761) [3] |
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17/ | 00 | Structural details; Housings [7] |
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17/ | 02 | . | Component assemblies [7] |
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17/ | 04 | . | . | Mounting of electronic components [7] |
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17/ | 06 | . | . | Electric connectors, e.g. conductive elastomers [7] |
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17/ | 08 | . | Housings [7] |
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19/ | 00 | Electric power supply circuits specially adapted for use in electronic time-pieces [7] |
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19/ | 02 | . | Conversion or regulation of current or voltage [7] |
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19/ | 04 | . | . | Capacitive voltage division or multiplication [7] |
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19/ | 06 | . | . | Regulation [7] |
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19/ | 08 | . | Arrangements for preventing voltage drop due to overloading the power supply [7] |
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19/ | 10 | . | Arrangements for supplying back-up power [7] |
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19/ | 12 | . | Arrangements for reducing power consumption during storage [7] |
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