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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 G 04 C. [3] |
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1/ | 00 | Subject matter not provided for in groups G 04 G 3/00 to G 04 G 15/00 [3] |
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3/ | 00 | Producing timing pulses (driving circuits for stepping motors G 04 C 3/14; producing preselected time intervals for use as timing standards G 04 F 5/00; pulse technique in general H 03 K; control, synchronisation, or stabilisation of generators in general H 03 L) |
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3/ | 02 | . | Circuits for deriving low frequency timing pulses from pulses of higher frequency (pulse frequency dividers in general H 03 K 23/00 to H 03 K 29/00) [3] |
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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 (G 04 G 11/00, G 04 G 13/00 take precedence; pulse delay circuits H 03 K 5/13; electronic time-delay switches H 03 K 17/28; electronic time-programme switches which automatically terminate their operation after the programme is completed H 03 K 17/296) |
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