(0)G04G:0/0:
IPC6
SECTION G - PHYSICS
ELECTRONIC TIME-PIECES
G04G
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G 04 G

 ELECTRONIC TIME-PIECES [3]
 

Notes

(1)

 This subclass covers:
 

-

 electronic time-pieces with no moving parts; [3]
 

-

 electronic circuitry for producing timing pulses irrespective of the nature of the time-indicating means utilised. [3]

(2)

 This subclass does not cover electronic time-pieces with moving parts, which are covered by subclass G 04 C. [3]

 

 

 
 

 1
/ 00 Subject matter not provided for in groups G 04 G 3/00 to G 04 G 15/00 [3]
 

 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) [3]

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]  
 

 5
/ 00 Setting, i.e. correcting or changing, the time-indication [3]

5
/ 02 • by temporarily changing the number of pulses per unit time, e.g. quick-feed method [3]  

5
/ 04 • by setting each of the displayed values, e.g. date, hour, independently [3]  
 

 7
/ 00 Synchronisation [3]

7
/ 02 • by radio [3]  
 

 9
/ 00 Visual time or date indication means [3]

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]  

9
/ 04 • • by controlling light sources, e.g. electroluminescent diodes [3]  

9
/ 06 • • using light valves, e.g. liquid crystals [3]  

9
/ 08 • by building-up characters using a combination of indicating elements, e.g. by using multiplexing techniques [3]  

9
/ 10 • • by controlling light sources, e.g. electroluminescent diodes [3]  

9
/ 12 • • using light valves, e.g. liquid crystals [3]  
 

 11
/ 00 Producing optical signals at preselected times [3]
 

 13
/ 00 Producing acoustic time signals [3]

13
/ 02 • at preselected times, e.g. alarm clocks [3]  
 

 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) [3]